SS/HA 71' Duster am I doing this right ?
#155740
11/24/08 10:38 AM
11/24/08 10:38 AM
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Posts: 411 Big Island ,VA
JC Childress
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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
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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
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JC Childress
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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
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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
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Joined: Jan 2003
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clonestocker
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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
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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
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Joined: Jul 2006
Posts: 4,595 On the south side of Nowhere
S/ST 3040
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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. ![](/ubbthreads/images/graemlins/Twocents.gif)
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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
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JC Childress
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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
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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
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Joined: Jul 2006
Posts: 4,595 On the south side of Nowhere
S/ST 3040
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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.
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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
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JC Childress
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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
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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
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Joined: Jan 2008
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JC Childress
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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
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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
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Joined: Aug 2003
Posts: 4,994 new jersey usa
11secdart
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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.
68 Dart 410 / 904 92 D150 original owner 21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4 23 Audi Q5 16 Honda HRV
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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
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Joined: Nov 2003
Posts: 3,060 Western New York
sixpackbee
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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
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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
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Joined: Jan 2008
Posts: 411 Big Island ,VA
JC Childress
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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
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