|
Re: high performance 318 build (on 87 octane)
[Re: ZIPPY]
#2583389
11/26/18 08:38 PM
11/26/18 08:38 PM
|
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
Rapid340
OP
top fuel
|
OP
top fuel
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
|
Thanks to all for the encouraging words.
"High performance" is relative. In the muscle car era stock 340s or 383 magnums were considered by many to be high performance. 318s were never used in a factory performance application with the exception of the 80s cop cars.
A flat tappet cam was used to keep costs down, I've done a bunch of magnums with FT cams and they have performed well. IMO in the low duration hydraulic realm a FT which has snappy close and open off-the-seat, goes a long way. This motor was done with the goal of "budget performance". Low fuel consumption and cheap 87 octane for someone who is just going to do a ton of cruising and driving.
With headers and carb I wanted to approach or exceed the power of a stock 440 magnum or 5.7 hemi (while enjoying the benefits of a lighter engine/904 trans). I love building motors like this. There isnt a high dollar part to be found anywhere in it. The owner loves it BTW.
318, 340, 360, 408 etc. My problem is I love them all.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: Rapid340]
#2583522
11/27/18 01:37 AM
11/27/18 01:37 AM
|
Joined: Nov 2006
Posts: 1,074
Manitoba Canada
67autocross
super stock
|
super stock
Joined: Nov 2006
Posts: 1,074
Manitoba Canada
|
I figured that is way you went with the ft cam...I just bought a lunati magnum roller and just the cam was $500 here in Canada.
Do you run adjustable rockers? Thanks and great build!
A new iron curtain drawn across the 49th parallel
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: 67autocross]
#2583593
11/27/18 10:12 AM
11/27/18 10:12 AM
|
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
Rapid340
OP
top fuel
|
OP
top fuel
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
|
No aftermarket rockers. Again, a budget build. The next step up would be a higher compression piston with a tight quench that would allow pump premium. Guaranteed gain across entire RPM band (as well as MPG)
1971 Factory Appearing Duster 340 11.000 @ 122 mph
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: Rapid340]
#2583687
11/27/18 02:42 PM
11/27/18 02:42 PM
|
Joined: Jan 2003
Posts: 17,838
S.E. Michigan
ZIPPY
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 17,838
S.E. Michigan
|
Jeff, is that a Procomp HEI distributor?
Wondered how you guys liked working with it.
Thx
Rich
Rich H.
Esse Quam Videri
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: Rapid340]
#2583784
11/27/18 06:25 PM
11/27/18 06:25 PM
|
Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
jyrki
master
|
master
Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
|
During the last year I've built three 318's that I took to dyno. Nothing special, or at least special in a sensible way, but real world build ups with low budget and probably medicore results.
1) A 1980 318. New bearings and rings, hone job. Double roller timing chain. Stock heads with stock valves, milled .040" and homeported. Comp Cams 260 HE cam, factory distributor with quick and short advance, performer intake, 1850 Holley and shorty headers with 3" exhaust and mufflers. 265 hp between 4500-5000 rpm.
2) a '73 318, .030 oversize, KB hupereutectic pistons,302 heads with 1.88" intake valve, homeported. Cam was a comp cams XE275HL and the intake an old Offenhauser 2 x 4 with twin 400 cfm carters. Distributor unknown electric, same shorty headers and exhaust as in 1). 335 hp at 5500 and still raising, the owner didn't want to wind it higher. Might have produced a few more.
3) a '71 318. '030" overbore, old TRW dome pistons with the dome shaved a lot, just over 10:1 cr. polished 360 rods with ARP bolts. mid 70's 360 heads with 2.02/1.60 valves, homeported. Lunati Voodoo 30200741 solid cam, 273 pushrods and rockers. Torker 2 intake, 1850 Holley, 1 5/8" cheapo headers, 3" exhaust with mufflers, MSD pro billet distributor. 391 hp at 6000.
Plynouth VIP '67 TT IC EFI
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: jyrki]
#2583802
11/27/18 07:08 PM
11/27/18 07:08 PM
|
Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
During the last year I've built three 318's that I took to dyno. Nothing special, or at least special in a sensible way, but real world build ups with low budget and probably medicore results.
1) A 1980 318. New bearings and rings, hone job. Double roller timing chain. Stock heads with stock valves, milled .040" and homeported. Comp Cams 260 HE cam, factory distributor with quick and short advance, performer intake, 1850 Holley and shorty headers with 3" exhaust and mufflers. 265 hp between 4500-5000 rpm.
2) a '73 318, .030 oversize, KB hupereutectic pistons,302 heads with 1.88" intake valve, homeported. Cam was a comp cams XE275HL and the intake an old Offenhauser 2 x 4 with twin 400 cfm carters. Distributor unknown electric, same shorty headers and exhaust as in 1). 335 hp at 5500 and still raising, the owner didn't want to wind it higher. Might have produced a few more.
3) a '71 318. '030" overbore, old TRW dome pistons with the dome shaved a lot, just over 10:1 cr. polished 360 rods with ARP bolts. mid 70's 360 heads with 2.02/1.60 valves, homeported. Lunati Voodoo 30200741 solid cam, 273 pushrods and rockers. Torker 2 intake, 1850 Holley, 1 5/8" cheapo headers, 3" exhaust with mufflers, MSD pro billet distributor. 391 hp at 6000. A Strip Dominator, a good 750 double pumper and 1.75 headers and that last build you've posted would have been close to 450 HP and not lost one iota of driveability. A nice, current 4000 street converter in an A body with a 3.73 gear and you are looking at a very low 12 second car. If you screwed with and got some bite to it, it would go in the 11's all day long.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: Rapid340]
#2584043
11/28/18 04:17 AM
11/28/18 04:17 AM
|
Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
jyrki
master
|
master
Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
|
Probably true, it was just built for fun from parts laying around. It's still a very strong 318.
Plynouth VIP '67 TT IC EFI
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: Rapid340]
#2584079
11/28/18 10:59 AM
11/28/18 10:59 AM
|
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
Rapid340
OP
top fuel
|
OP
top fuel
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
|
I haven't personally used the Chinese HEI distributors but a couple guys I build motors for have. Not sure if they even fit in an A-body car (its tight in a B-body so I kinda doubt it). This guy used it mainly because everything is self contained so all he needed to do was connect 12V.
I like stock looking stuff. The buyer had a choice of an old style mopar M1 dual plane intake or this airgap. If it were me I would have used the M1(it is basically a slightly enhanced stock 340 4bbl intake cast in aluminum) and a mopar ignition along with some stock valve covers (stock LA valve covers can be used on magnum heads with very little work. The five bolt holes line up perfectly) Paint the whole thing red and you have a stock looking 318.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: Rapid340]
#2584090
11/28/18 11:24 AM
11/28/18 11:24 AM
|
Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
I haven't personally used the Chinese HEI distributors but a couple guys I build motors for have. Not sure if they even fit in an A-body car (its tight in a B-body so I kinda doubt it). This guy used it mainly because everything is self contained so all he needed to do was connect 12V.
I like stock looking stuff. The buyer had a choice of an old style mopar M1 dual plane intake or this airgap. If it were me I would have used the M1(it is basically a slightly enhanced stock 340 4bbl intake cast in aluminum) and a mopar ignition along with some stock valve covers (stock LA valve covers can be used on magnum heads with very little work. The five bolt holes line up perfectly) Paint the whole thing red and you have a stock looking 318.
You can fit an HEI in an A body, but like you say, it's a tight mother. I have a Mallory Comp 9000 I'm going to install and that's a tight mother.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: jyrki]
#2584093
11/28/18 11:25 AM
11/28/18 11:25 AM
|
Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
Probably true, it was just built for fun from parts laying around. It's still a very strong 318. No doubt that 318 would catch many off guard. All you have to do is go to the local drag strip and see how many 500 HP guys are running 12's to know they've never even seen a dyno, let alone had anything on one.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: Rapid340]
#2584171
11/28/18 02:20 PM
11/28/18 02:20 PM
|
Joined: Jan 2003
Posts: 17,838
S.E. Michigan
ZIPPY
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 17,838
S.E. Michigan
|
I haven't personally used the Chinese HEI distributors but a couple guys I build motors for have. Not sure if they even fit in an A-body car (its tight in a B-body so I kinda doubt it). This guy used it mainly because everything is self contained so all he needed to do was connect 12V.
I like stock looking stuff. The buyer had a choice of an old style mopar M1 dual plane intake or this airgap. If it were me I would have used the M1(it is basically a slightly enhanced stock 340 4bbl intake cast in aluminum) and a mopar ignition along with some stock valve covers (stock LA valve covers can be used on magnum heads with very little work. The five bolt holes line up perfectly) Paint the whole thing red and you have a stock looking 318.
Good info. Seems like the Procomp HEI works well enough for him. I had to go back and watch it again to make sure I was seeing what I thought I was seeing.
Rich H.
Esse Quam Videri
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: Rapid340]
#2584245
11/28/18 04:23 PM
11/28/18 04:23 PM
|
Joined: Jan 2006
Posts: 3,535
Canuckville
68Cbarge
master
|
master
Joined: Jan 2006
Posts: 3,535
Canuckville
|
Interesting thread.
In the spring I will be refreshing my 73 Waygun's 318 (with 3 on da tree)
It already has 800CFM Thermoquad,1971 340 intake dual exhaust with factory logs.Recurved distributor with Summit ECU.
I do haul with the waygun and being 3 on da tree in a heavy car I would like some suggestions on camshaft specs
Thanks in advance
'68 Newport Custom Barge on a Budget!! BOAB
1973 Satellite WAGON! 318- 3 on the tree!!
2008 Chrysler 300c HEMI!
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: 68Cbarge]
#2584252
11/28/18 04:33 PM
11/28/18 04:33 PM
|
Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
Interesting thread.
In the spring I will be refreshing my 73 Waygun's 318 (with 3 on da tree)
It already has 800CFM Thermoquad,1971 340 intake dual exhaust with factory logs.Recurved distributor with Summit ECU.
I do haul with the waygun and being 3 on da tree in a heavy car I would like some suggestions on camshaft specs
Thanks in advance
Call Jim at Racer Brown for a cam. That is one damn fine car and cool as hell. I wouldn't change much.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: high performance 318 build (on 87 octane)
[Re: madscientist]
#2584301
11/28/18 06:23 PM
11/28/18 06:23 PM
|
Joined: Jan 2006
Posts: 3,535
Canuckville
68Cbarge
master
|
master
Joined: Jan 2006
Posts: 3,535
Canuckville
|
Interesting thread.
In the spring I will be refreshing my 73 Waygun's 318 (with 3 on da tree)
It already has 800CFM Thermoquad,1971 340 intake dual exhaust with factory logs.Recurved distributor with Summit ECU.
I do haul with the waygun and being 3 on da tree in a heavy car I would like some suggestions on camshaft specs
Thanks in advance
Call Jim at Racer Brown for a cam. That is one damn fine car and cool as hell. I wouldn't change much. Thanks! Not going crazy with it.Just making it more fun to drive and better to run on today's gas. A modern update so to speak. Today's cam modern cam grinds are much more efffiecent. All parts ar bolt on so it can be reversed back to stock if need be but she is a keeper.
'68 Newport Custom Barge on a Budget!! BOAB
1973 Satellite WAGON! 318- 3 on the tree!!
2008 Chrysler 300c HEMI!
|
|
|
|
|
