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SS/HA 71' Duster am I doing this right ? #155740 11/24/08 10:38 AM 11/24/08 10:38 AM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	Can someone tell me if I'm figuring this right. I went on the NHRA site and saw the 71' Plymouth Duster with the hi comp 340 is factored at 314 hp and falls into the 10.04 lb weight break ( SS/I or IA ). Since you can move up or down one class, couldnt this be a SS/HA combination, and race weight with driver be 3153 lbs ( 314 hp X 9.50 lbs = 2983 + 170 lbs = 3153 )? I wanna know if I'm doing this right and also, has anyone ever ran a Duster in SS/HA ? Do you think it would be a decent combination ? Thanks for any help J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155741 11/24/08 10:41 AM 11/24/08 10:41 AM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom master
scatpacktom master S Joined: Jan 2003 Posts: 3,103 Phila Pa	Guys seem to like the low comp 1.88 valve combos better

Re: SS/HA 71' Duster am I doing this right ? [Re: scatpacktom] #155742 11/24/08 11:25 AM 11/24/08 11:25 AM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	OK...I was looking at the Stock eliminator weight . My mistake. It keeps looking like a 360 is the way to go as far as the engine combination. I was hoping maybe a hi comp 340, but it just doesnt seem like the way to go. J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155743 11/24/08 11:45 AM 11/24/08 11:45 AM
Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing bremotorsports master
bremotorsports master Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing	For Stock the 71 340 is 310, and for Super Stock the factor is 283. That being the case , the Duster as a SS car would be killer! Go to my website (www.billrolikenterprises.com) and then click on "Significant Rides" at the top. You will see the 71 340 Cuda that is in the initial stages of upgrade for return to competition. Bill Rolik

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155744 11/24/08 11:49 AM 11/24/08 11:49 AM
Joined: Jan 2003 Posts: 2,155 Tucson, Arizona clonestocker top fuel
clonestocker top fuel Joined: Jan 2003 Posts: 2,155 Tucson, Arizona	The 360 combos are good. Lots of options. Small cam, small carb, big cam, big carb. I built an Aspen Wagon Stocker that now resides in Las Vegas. I went to a reputable head guy (rip Don), he did my heads, cam, piston/ring package. I did change the ring package at assembly. It went a best of 1.06 under with everything done by myself and locally. It was fun but to rich for my blood. STOCKER ARE WAY COOL. good luck matt [img] [/img]

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155745 11/24/08 12:08 PM 11/24/08 12:08 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	The reason the high compression 340 isn't competitive is the heads. Since the 71-earlier 340 had 2.02" valves and the runner volume spec is 158-162cc........when you open up the bowls for the 2.02" valve and shrink the runners to stay legal, you choke off the port. 283 HP factoring helps.

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155746 11/24/08 12:28 PM 11/24/08 12:28 PM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	If you were building a 360 SS engine....would you be better off using the Magnum heads ( even though they hit you with a weight penalty ). Is it an advantage to using these heads ? I know they flow more, but what about the pushrod oiling....does that impose any problems or how do you experts feel about this comparison ? J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: clonestocker] #155747 11/24/08 12:33 PM 11/24/08 12:33 PM
Joined: Nov 2003 Posts: 3,060 Western New York sixpackbee master
sixpackbee master Joined: Nov 2003 Posts: 3,060 Western New York	Quote: STOCKER ARE WAY COOL. There are those of us on the east coast that also say: Our coolers are way stocked. Anyhow, Like Bill said above, at 283 factored HP the compression 340 is a good combo right now. I am considering a move to the high compression from my low over the winter. The stock factoring is not as favorable as the SS one. 1959 Bugeye Sprite 1967 Charger Black L code 1967 Coronet R/T Convert Green 440 auto bought from original owner 1968 Charger R/T Bronze 440 4 spd console AM/FM 1969 Super Bee WM21H B5 A40 D21 N96 1969 Barracuda Formula S 340 Convert pilot car 1969 Hemi Road Runner RM23J D32 Omaha orange 4.10 Dana N96 N85 1970 Super Bee WM23N FE5 V1X 3.91 axle package, N96 1970 Road Runner RM21N B3 V1X D13 1971 MG Midget 1971 Road Runner RM23H GW3, A57 1972 Road Runner RM23P FY1, D21

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155748 11/24/08 12:55 PM 11/24/08 12:55 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	I'm not a class racer so, I'm just giving my 2 cents on this subject. Knowing the extensive porting employed in S/S, the Magnum head may be the trick. They have decent shaped bowls, better chambers and much better exhaust ports. I have a Magnum head that was donated to me for R&D, but, haven't persued yet. 4835643-DSCN1999.JPG (333 downloads)

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155749 11/24/08 12:59 PM 11/24/08 12:59 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Gonna need some work! 4835657-DSCN2000.JPG (375 downloads)

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155750 11/24/08 01:00 PM 11/24/08 01:00 PM
Joined: Jan 2003 Posts: 6,840 The Swamp S Sixpak master
Sixpak master S Joined: Jan 2003 Posts: 6,840 The Swamp	How about the 89 360 308 head for a low compression 340 or 360? Seen a few low compression motors in in SS/JA...

Re: SS/HA 71' Duster am I doing this right ? [Re: Sixpak] #155751 11/24/08 06:16 PM 11/24/08 06:16 PM
Joined: Jan 2003 Posts: 269 Kansas wishing I was in Ohio S SeanD enthusiast
SeanD enthusiast S Joined: Jan 2003 Posts: 269 Kansas wishing I was in Ohio	You might want to look into a GT class if you are thinking of running in SS. A lot of the Daytona/Sebring and Stratus cars run a 318/4 bbl combo and run really well. Might be worth it to run same engine in an "A" body.

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155752 11/25/08 10:40 AM 11/25/08 10:40 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: The reason the high compression 340 isn't competitive is the heads. Since the 71-earlier 340 had 2.02" valves and the runner volume spec is 158-162cc........when you open up the bowls for the 2.02" valve and shrink the runners to stay legal, you choke off the port. 283 HP factoring helps. In an afterthought, it dawned on me that the 68-70 340 used the smaller AVS which also doesn't help the HP but, am unable to edit any of my posts, that are more than a couple hours old.

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155753 11/25/08 11:18 AM 11/25/08 11:18 AM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	But the 71' having the thermoquad did help for sure. I'm heavily considering the low comp 340 and running it in SS/IA , at least for now....but who knows. I wish I knew if anyone had done extensive testing with the Super Victor compared to the Victor 340 on the super stock type heads. J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155754 11/25/08 11:28 AM 11/25/08 11:28 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Unless you have a 72 or 73 body, you'll have to run SS/GT with the low compression engine.

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155755 11/25/08 11:37 AM 11/25/08 11:37 AM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	I'm looking at a 71 and a 73 model. Havent decided just yet on either one. Since they let you run the older cars in Gt , it can really get confusing. J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155756 11/25/08 01:13 PM 11/25/08 01:13 PM
Joined: Aug 2003 Posts: 4,993 new jersey usa 1 11secdart master
11secdart master 1 Joined: Aug 2003 Posts: 4,993 new jersey usa	I am only a bracket racer but I really like Stock and Super/Stock, I am still confused on older cars running in GT classes which I thought were for late model cars/bodies. 4838164-CCEventsPhotoGallery-PittDSC_0054-PoweredbyPhotoPost.mht (216 downloads) 68 Dart 410 / 904 92 D150 original owner 21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4 23 Audi Q5 16 Honda HRV

Re: SS/HA 71' Duster am I doing this right ? [Re: 11secdart] #155757 11/25/08 01:21 PM 11/25/08 01:21 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	GT classes allow any year engine and any year body (same manufacturer) to be used together. i.e. 70 Duster/74 360 4-bbl.

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155758 11/25/08 01:29 PM 11/25/08 01:29 PM
Joined: Nov 2003 Posts: 3,060 Western New York sixpackbee master
sixpackbee master Joined: Nov 2003 Posts: 3,060 Western New York	JC after talking yesterday I was thinking, dangerous sometimes, build the 71 TQ package. If you do not like it switch to a 72 340 small valve. The bodies are close enough for tech. The only thing you would be out if you switched would be heads and pistons. Expensive yes but better than trying to field a whole new car. BTW the Victor 340 is still the way to go. If you decide to do this I can help you with the proper mods for the intake. 1959 Bugeye Sprite 1967 Charger Black L code 1967 Coronet R/T Convert Green 440 auto bought from original owner 1968 Charger R/T Bronze 440 4 spd console AM/FM 1969 Super Bee WM21H B5 A40 D21 N96 1969 Barracuda Formula S 340 Convert pilot car 1969 Hemi Road Runner RM23J D32 Omaha orange 4.10 Dana N96 N85 1970 Super Bee WM23N FE5 V1X 3.91 axle package, N96 1970 Road Runner RM21N B3 V1X D13 1971 MG Midget 1971 Road Runner RM23H GW3, A57 1972 Road Runner RM23P FY1, D21

Re: SS/HA 71' Duster am I doing this right ? [Re: sixpackbee] #155759 11/26/08 11:12 AM 11/26/08 11:12 AM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	I see where youre coming from, but after more and more research and thought, I think the 360 is the way to go. It carries just a tick more weight than the low comp 340, but you get an additional 20 cubic inches ! Plus, you wont have to turn the engine near as hard. At least thats how I'm thinking right now. J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155760 11/26/08 11:23 AM 11/26/08 11:23 AM
Joined: Nov 2003 Posts: 3,060 Western New York sixpackbee master
sixpackbee master Joined: Nov 2003 Posts: 3,060 Western New York	Quote: you wont have to turn the engine near as hard I hear you on that. Probably close to 1,000 revs less. 1959 Bugeye Sprite 1967 Charger Black L code 1967 Coronet R/T Convert Green 440 auto bought from original owner 1968 Charger R/T Bronze 440 4 spd console AM/FM 1969 Super Bee WM21H B5 A40 D21 N96 1969 Barracuda Formula S 340 Convert pilot car 1969 Hemi Road Runner RM23J D32 Omaha orange 4.10 Dana N96 N85 1970 Super Bee WM23N FE5 V1X 3.91 axle package, N96 1970 Road Runner RM21N B3 V1X D13 1971 MG Midget 1971 Road Runner RM23H GW3, A57 1972 Road Runner RM23P FY1, D21

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155761 11/26/08 11:26 AM 11/26/08 11:26 AM
Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing bremotorsports master
bremotorsports master Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing	It is more about the torque difference from the increased stroke than the displacement, especially if you intend to run the heaviest possible class. And you will definitely run less rpm because of the longer stroke. Also, since the heads are the same, the 340 "sees" the heads as better BECAUSE of fewer cubes. Bill Rolik

Re: SS/HA 71' Duster am I doing this right ? [Re: bremotorsports] #155762 11/26/08 12:24 PM 11/26/08 12:24 PM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	I am really liking the 360 combo. Even carrying a few extra pounds, it seems like the logical way to go. For whatever reason, it just seems like nobody has got the Super Victor to outperform the old Victor 340. J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155763 11/26/08 05:51 PM 11/26/08 05:51 PM
Joined: Jan 2003 Posts: 269 Kansas wishing I was in Ohio S SeanD enthusiast
SeanD enthusiast S Joined: Jan 2003 Posts: 269 Kansas wishing I was in Ohio	Quote: For whatever reason, it just seems like nobody has got the Super Victor to outperform the old Victor 340. A few years ago(maybe 10 years) I read an article about someone mating up a sb chevy victor intake to a 340 and running in ss/GT. They said the chevy intake outperformed the mopar intake by a bunch.

Re: SS/HA 71' Duster am I doing this right ? [Re: SeanD] #155764 11/26/08 06:00 PM 11/26/08 06:00 PM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	Yeah, I know of folks that have done that. I just dont know how big of an advantage it is, if any. J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155765 11/26/08 06:22 PM 11/26/08 06:22 PM
Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing bremotorsports master
bremotorsports master Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing	For a number of years, the hot ticket, for the 360 only, was the Offy Port-O-Sonic. I actually still have the one that I modified to create an air gap under the plenum. Bill Rolik

Re: SS/HA 71' Duster am I doing this right ? [Re: SeanD] #155766 11/26/08 08:29 PM 11/26/08 08:29 PM
Joined: Jan 2003 Posts: 5,898 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,898 Florida	Quote: Quote: For whatever reason, it just seems like nobody has got the Super Victor to outperform the old Victor 340. A few years ago(maybe 10 years) I read an article about someone mating up a sb chevy victor intake to a 340 and running in ss/GT. They said the chevy intake outperformed the mopar intake by a bunch. Hamburger use to have an adapter to use a small block Chevy intake on a small block Mopar. But that was in the '70's or '80's before the Mopar selection expanded.

Re: SS/HA 71' Duster am I doing this right ? [Re: bremotorsports] #155767 11/26/08 08:39 PM 11/26/08 08:39 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: For a number of years, the hot ticket, for the 360 only, was the Offy Port-O-Sonic. I actually still have the one that I modified to create an air gap under the plenum. Bill Rolik It's a small world. Is that the only one you ever had? Super Stock intake picture deleted due to Top Secret Clearance Breech and threats! Last edited by S/ST 3040; 11/26/08 10:24 PM.

Re: SS/HA 71' Duster am I doing this right ? [Re: bremotorsports] #155768 11/26/08 09:06 PM 11/26/08 09:06 PM
Joined: Nov 2003 Posts: 3,060 Western New York sixpackbee master
sixpackbee master Joined: Nov 2003 Posts: 3,060 Western New York	Quote: For a number of years, the hot ticket, for the 360 only, was the Offy Port-O-Sonic We did some dyno work on a 360 SS engine and compared the Offy to the Victor 340. On a 360 the Port-O-Sonic was the way to go. This was on one of the better 360s around at that time. 1959 Bugeye Sprite 1967 Charger Black L code 1967 Coronet R/T Convert Green 440 auto bought from original owner 1968 Charger R/T Bronze 440 4 spd console AM/FM 1969 Super Bee WM21H B5 A40 D21 N96 1969 Barracuda Formula S 340 Convert pilot car 1969 Hemi Road Runner RM23J D32 Omaha orange 4.10 Dana N96 N85 1970 Super Bee WM23N FE5 V1X 3.91 axle package, N96 1970 Road Runner RM21N B3 V1X D13 1971 MG Midget 1971 Road Runner RM23H GW3, A57 1972 Road Runner RM23P FY1, D21

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155769 11/26/08 10:18 PM 11/26/08 10:18 PM
Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing bremotorsports master
bremotorsports master Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing	RE: "Air Gap" Offy There were two done locally. I still have one of them. Bill Rolik

Re: SS/HA 71' Duster am I doing this right ? [Re: Locomotion] #155770 11/26/08 10:22 PM 11/26/08 10:22 PM
Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing bremotorsports master
bremotorsports master Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing	Myron, I know Louis Smith in Canada made adapters, and I believe Sonny Stancil did as well. I am not sure if either did enough development with them to determine if a Chevy piece was markedly better. Bill Rolik

Re: SS/HA 71' Duster am I doing this right ? [Re: bremotorsports] #155771 11/26/08 10:23 PM 11/26/08 10:23 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: RE: "Air Gap" Offy There were two done locally. I still have one of them. Bill Rolik I have a "one of two" produced S/S manifold.

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155772 12/01/08 02:49 PM 12/01/08 02:49 PM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	I knew Louis Smith had done some testing with the Chevy intakes. I'm really suprised that in todays world of r&d that no one has ever just back to backed a bunch of intakes, including the Chevy against the Mopar intake. We did a dyno test on one of our customers engines ( at his request and expense ) , its a 355 Chevy, roughly 600hp, and the winner was a World Products intake. Some mentioned the Port A Sonic was better on the 360....what makes the 360 like a different intake than the 340 ? J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155773 12/01/08 03:45 PM 12/01/08 03:45 PM
Joined: Nov 2003 Posts: 3,060 Western New York sixpackbee master
sixpackbee master Joined: Nov 2003 Posts: 3,060 Western New York	Quote: Some mentioned the Port A Sonic was better on the 360....what makes the 360 like a different intake than the 340 ? Mainly the different stroke. Desides the lower RPM in a 360 it also dictates different piston speeds and accelerations which in turn cause different intake signals. The cams are different too. We did back to back intakes on both 360 and 340 Super Stock engines several times. 1959 Bugeye Sprite 1967 Charger Black L code 1967 Coronet R/T Convert Green 440 auto bought from original owner 1968 Charger R/T Bronze 440 4 spd console AM/FM 1969 Super Bee WM21H B5 A40 D21 N96 1969 Barracuda Formula S 340 Convert pilot car 1969 Hemi Road Runner RM23J D32 Omaha orange 4.10 Dana N96 N85 1970 Super Bee WM23N FE5 V1X 3.91 axle package, N96 1970 Road Runner RM21N B3 V1X D13 1971 MG Midget 1971 Road Runner RM23H GW3, A57 1972 Road Runner RM23P FY1, D21

Re: SS/HA 71' Duster am I doing this right ? [Re: sixpackbee] #155774 12/01/08 03:53 PM 12/01/08 03:53 PM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	What different intakes did ya'll test ? Were they on Super Stock engines and if so...what did the different engines like ? J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: JC Childress] #155775 12/01/08 04:00 PM 12/01/08 04:00 PM
Joined: Nov 2003 Posts: 3,060 Western New York sixpackbee master
sixpackbee master Joined: Nov 2003 Posts: 3,060 Western New York	The 340s liked the Victor and the 360s liked the Port-O-Sonic. Looking into a sheet metal design would be interesting. BTW the engines tested were front runners in their time as was the shop so the tests were legit. 1959 Bugeye Sprite 1967 Charger Black L code 1967 Coronet R/T Convert Green 440 auto bought from original owner 1968 Charger R/T Bronze 440 4 spd console AM/FM 1969 Super Bee WM21H B5 A40 D21 N96 1969 Barracuda Formula S 340 Convert pilot car 1969 Hemi Road Runner RM23J D32 Omaha orange 4.10 Dana N96 N85 1970 Super Bee WM23N FE5 V1X 3.91 axle package, N96 1970 Road Runner RM21N B3 V1X D13 1971 MG Midget 1971 Road Runner RM23H GW3, A57 1972 Road Runner RM23P FY1, D21

Re: SS/HA 71' Duster am I doing this right ? [Re: sixpackbee] #155776 12/01/08 04:41 PM 12/01/08 04:41 PM
Joined: Jan 2008 Posts: 411 Big Island ,VA J JC Childress OP mopar
JC Childress OP mopar J Joined: Jan 2008 Posts: 411 Big Island ,VA	Does anyone still sell the Port a Sonics or did they go out of business ? Did ya'll test the adapted Chevy intakes as well ? J.C. Childress (434) 665-9541

Re: SS/HA 71' Duster am I doing this right ? [Re: sixpackbee] #155777 12/01/08 04:49 PM 12/01/08 04:49 PM
Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing bremotorsports master
bremotorsports master Joined: Aug 2003 Posts: 2,902 New Jersey Bada Bing	This exactly what I found with similar testing. Also, on the 340 (72-73 Low Compression), the Holley Strip Dominator ran the same ET as the Victor, but the Victor was 1 mph faster. Bill Rolik

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155778 12/25/08 09:10 PM 12/25/08 09:10 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: I have a Magnum head that was donated to me for R&D, but, haven't persued yet. #466 Casting 1.92" x 1.625" Intake .100"_____63.7 .200"____122.9 .300"____165.4 .400"____203.5 .480"____219.0 Peak .550"____203.1 .600"____201.9 Exhaust .100"_____51.6 .200"____109.0 .300"____148.9 .400"____159.7 .500"____166.3 Intake has my valve job using the factory valve. Exhaust was completely unmodified. It was done after .500" As ugly as it is, it flows better than an unported LA head. I'll still take the 360 LA head for racing, as long as porting is allowed.

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155779 12/26/08 12:38 PM 12/26/08 12:38 PM
Joined: Dec 2005 Posts: 293 Kansas City Metro M mbogina enthusiast
mbogina enthusiast M Joined: Dec 2005 Posts: 293 Kansas City Metro	when we ran the 71 Duster TQ combo in SS/IA, we also used the Holley Strip Dominator (modified/with spacers) for the best HP/TQ. I still feel the 71 Hi comp/small TQ/308 head combo is very viable when compared to the 360 Be a Rebel- Break the Laws of Physics!

Re: SS/HA 71' Duster am I doing this right ? [Re: mbogina] #155780 12/26/08 12:59 PM 12/26/08 12:59 PM
Joined: Feb 2003 Posts: 240 Pottstown, Pa. S sg1093 enthusiast
sg1093 enthusiast S Joined: Feb 2003 Posts: 240 Pottstown, Pa.	The AMX I have been racing in SS/HA is a 390 ci , Carter AFB 525 cfm 4 bbl and at 3100 lbs I have gone a best of 10.21 on the 10.90 index. I am usually the slowest SS/HA car, I would think you can get the Duster quicker than that. My min. weight is 3020 lbs, so I am working over the winter to lighten up and try to get the car quicker. 4902503-Picture.jpg (182 downloads)

Re: SS/HA 71' Duster am I doing this right ? [Re: sg1093] #155781 12/27/08 03:47 PM 12/27/08 03:47 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	#466 Casting 1.92" x 1.625" Intake .............BEFORE...................................AFTER .100"_____63.7_________________________63.2 .200"____122.9________________________126.4 .300"____165.4________________________173.5 .400"____203.5________________________223.7 .480"____219.0_________________.450"___243.0 .550"____203.1_________________.500"___250.3 .600"____201.9_________________.550"___244.2 Exhaust ..........BEFORE.......................................AFTER .100"_____51.6_________________________52.5 .200"____109.0________________________112.0 .300"____148.9________________________159.1 .400"____159.7________________________181.5 .500"____166.3________________________187.3 .550"_________________________________188.4 .600"_________________________________189.5 Same ports, roughed in to see what it takes to get air through them. Exhaust will go over 200 with a little more work. Again, I'll stick with the LA. The Magnum, in my opinion, would work good on a "Limited" no-porting rule dirt tracker or low lift cam, low-buck street engine. Porting these intake ports, is not fun. 4904589-DSCN2076.JPG (167 downloads)

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155782 12/27/08 03:53 PM 12/27/08 03:53 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Another photo showing hole in pushrod pinch. 4904599-DSCN2065.JPG (237 downloads)

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155783 12/29/08 11:42 PM 12/29/08 11:42 PM
Joined: Jan 2003 Posts: 14,515 So. Burlington, Vt. F fast68plymouth I Live Here
fast68plymouth I Live Here F Joined: Jan 2003 Posts: 14,515 So. Burlington, Vt.	Vic, did you CC that intake runner? they dont give you much to play with at all with the LA heads. i did a VERY minor clean up on a 596 head, still used a tulip 1.88 valve.......barely flowed like 230cfm(flowed 195-ish OOTB with OE valve and OE VJ).....and it was 165cc's.......or, 5 cc's too big to be legal in SS. what are some of the other magnum head casting numbers? i didnt see a "466" on the approved NHRA list. 68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads

Re: SS/HA 71' Duster am I doing this right ? [Re: fast68plymouth] #155784 12/29/08 11:55 PM 12/29/08 11:55 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	I did not cc the runner on this Magnum head. Only trying to see what all the fuss was on the these things and didn't want to give an unfounded opinion. So, I ate iron dust for an afternoon to see. I thought it was decent information to share. I'll try you at the shop tomorrow.

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155785 12/30/08 08:44 PM 12/30/08 08:44 PM
Joined: Jan 2005 Posts: 12,424 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,424 Kalispell Mt.	Have you looked at the old Ryan J ported magnums in the archives section? Looks like he did more work in the bowls and less in the PR pinch and got a little more flow that way. He got a hair more out of a stock set so that has to be considered but still he got around 270 might be worth a try. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: SS/HA 71' Duster am I doing this right ? [Re: HotRodDave] #155786 12/31/08 12:31 AM 12/31/08 12:31 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: Have you looked at the old Ryan J ported magnums in the archives section? Looks like he did more work in the bowls and less in the PR pinch and got a little more flow that way. He got a hair more out of a stock set so that has to be considered but still he got around 270 might be worth a try. I only did this to satisfy what little curiousity I had about the Magnum heads and now feel as I've educated myself well enough to stick with what I'm used to. Despite the lack of "shine", I was pretty thorough and don't see this port getting much better. An R/T head might be a different story but, as a Super Stock head, I see a few disadvantages if these were legal.

Re: SS/HA 71' Duster am I doing this right ? [Re: S/ST 3040] #155787 12/31/08 01:24 AM 12/31/08 01:24 AM
Joined: May 2004 Posts: 2,864 IN Irun5snd8th master
Irun5snd8th master Joined: May 2004 Posts: 2,864 IN	Interesting about the intakes. My good friend Jay Sanders had a chebbie intake on his 318 in a GT/KA Daytona several years ago. He stated that there was such a lack of good intakes at the time for the Mopars. I think the M1 was the cream of the crop at that particular time. I got one of his highly modified Strip Dominators still out in the garage. Ran great with the TQ and 4 inches of spacer on the car for many years. AFCO, Rons Fuel Injection sponsored Dodge Challenger Mention Street Lethal Motorsports

Re: SS/HA 71' Duster am I doing this right ? [Re: Irun5snd8th] #155788 12/31/10 08:04 AM 12/31/10 08:04 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	More good stuff for the hard core SB guys.

Re: SS/HA 71' Duster am I doing this right ? [Re: Sixpak] #155789 12/31/10 11:57 AM 12/31/10 11:57 AM
Joined: Nov 2003 Posts: 5,048 Atlanta Indiana D Dave Watt master
Dave Watt master D Joined: Nov 2003 Posts: 5,048 Atlanta Indiana	Quote: How about the 89 360 308 head for a low compression 340 or 360? Seen a few low compression motors in in SS/JA... Quote: You might want to look into a GT class if you are thinking of running in SS. A lot of the Daytona/Sebring and Stratus cars run a 318/4 bbl combo and run really well. Might be worth it to run same engine in an "A" body. My neighbor Joe E. was running a '68 Dart in IHRA Crate Motor until the class went away. He converted it to an NHRA GT car with the '89 360 308 heads combo. The HP factor is pretty low from what I remember. Ran some 10.20's without much testing. It's still running 9" tires too. Last edited by Dave Watt; 12/31/10 12:02 PM.

Re: SS/HA 71' Duster am I doing this right ? [Re: Dave Watt] #155790 12/31/10 08:28 PM 12/31/10 08:28 PM
Joined: Jan 2003 Posts: 5,898 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,898 Florida	Quote: My neighbor Joe E. was running a '68 Dart in IHRA Crate Motor until the class went away. He converted it to an NHRA GT car with the '89 360 308 heads combo. The HP factor is pretty low from what I remember. Ran some 10.20's without much testing. It's still running 9" tires too. Top Stock went away, not the regular IHRA Crate Motor classes. Several people are putting a Challenger Drag Pak 360 Magnum into older cars for SS/GT. There were only 3 Challengers ordered with that engine in the first year of Drag Paks.But al it takes is one to make it legal. Soft HP factor so far.

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