Can a 302 pump out 400+ HP?
Thread Starter
Le Mans Master
Joined: Dec 2001
Posts: 8,656
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From: Brooklyn NY
Can a 302 pump out 400+ HP?
i remember an article in "camaro untold secrets" that had a dyno chart that said it produced 400hp @ 7k RPM. What parts would be needed to do this? And are stock 302's street friendly? :confused:
Thread Starter
Le Mans Master
Joined: Dec 2001
Posts: 8,656
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From: Brooklyn NY
Re: Can a 302 pump out 400+ HP? (backtrail69)
http://www.camaro-untoldsecrets.com
it used a crossram, but what cam is that?
it used a crossram, but what cam is that?
Racer
Joined: Jan 2002
Posts: 440
Likes: 2
From: Smithfield NC
Re: Can a 302 pump out 400+ HP? (garagedweller2)
I'm a fan of the SBC 302.I plan to build one insome form or the other.
To answer your question here is a couple of links.One was built according to Trans-Am specs like the great Smokey Yunick built.www.edelbrock.com/automotive/stories/hr601/best_camaro.html
And another one.Probally not what you were thinking of but I love this engine and the possobilities it holds.www.ls1tech.com/ubb/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=00802 4
For more info on this combo do a search under my name. :cool:
To answer your question here is a couple of links.One was built according to Trans-Am specs like the great Smokey Yunick built.www.edelbrock.com/automotive/stories/hr601/best_camaro.html
And another one.Probally not what you were thinking of but I love this engine and the possobilities it holds.www.ls1tech.com/ubb/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=00802 4
For more info on this combo do a search under my name. :cool:
Drifting
Joined: Mar 2001
Posts: 1,411
Likes: 2
From: St. Louis, Missouri
Re: Can a 302 pump out 400+ HP? (garagedweller2)
The 302 was created to comply with the Trans Am (the race series - not the car) maximum engine displacement requirements of 305 CID. It was created by putting a 283 crankshaft in a 327 block (4.00" bore x 3.00" stroke). It was rated at 290 horsepower but everything coming out of detroit back then was rated conservatively.
As far as being street friendly, there are better choices. The 302 was built to go around a track at 4,000 - 7,000 RPM. If the rules back then allowed for a larger engine, believe me, Chevrolet would have used it. You'd be better off with the torque of a 350 - 383 CI engine on a big block for the street.
As far as being street friendly, there are better choices. The 302 was built to go around a track at 4,000 - 7,000 RPM. If the rules back then allowed for a larger engine, believe me, Chevrolet would have used it. You'd be better off with the torque of a 350 - 383 CI engine on a big block for the street.
Burning Brakes
Joined: Sep 2000
Posts: 922
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From: Maine
Re: Can a 302 pump out 400+ HP? (Neo Fender)
Agree with Neo Fender. They can make good power, but at mega-rpm. Wasn't the factory redline at 7200 or 7600? I knew a guy who used to dragrace and he turned a lot higher than that. Given a choice you'd probably be happier with bigger displacement.
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Race Director
Joined: May 2000
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Re: Can a 302 pump out 400+ HP? (Frank75)
The factory redline of the 302 Z-28 engine was 6500 as on other solid lifter SBs, but, especially with open exhaust, the stock engine would make power until the the valves floated.
The Traco built 302s with the cross ram manifold and 140 cam made a claimed 440 HP at 7200, In the seventies, five liter F5000 engines with Kinsler injection and better heads made about 500 HP at 8000.
Duke
[Modified by SWCDuke, 8:41 AM 10/12/2002]
The Traco built 302s with the cross ram manifold and 140 cam made a claimed 440 HP at 7200, In the seventies, five liter F5000 engines with Kinsler injection and better heads made about 500 HP at 8000.
Duke
[Modified by SWCDuke, 8:41 AM 10/12/2002]
Burning Brakes
Joined: Jan 2001
Posts: 1,169
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From: Manhattan
Re: Can a 302 pump out 400+ HP? (Neo Fender)
I'm with Neo
if i was gonna spend the money to make a screamer 302, I'd put it towards a screaming 377 (400 block with a 350 crank). you'd get a lot of the high reving characteristics, but gain 70 cu in. the extra displacement should add some much needed torque to keep a motor like this street-friendly.
again, they were under displacement restrictions, thus the small 302 displacement
if i was gonna spend the money to make a screamer 302, I'd put it towards a screaming 377 (400 block with a 350 crank). you'd get a lot of the high reving characteristics, but gain 70 cu in. the extra displacement should add some much needed torque to keep a motor like this street-friendly.
again, they were under displacement restrictions, thus the small 302 displacement
Melting Slicks
Joined: Oct 1999
Posts: 2,581
Likes: 14
From: Tolar Texas
Re: Can a 302 pump out 400+ HP?
Just speculation here, but couldn't you make a modern 302 by combining the crankshaft from a 1994-1996 4.3 liter, L99 (Baby LT-1 used in the Caprice) with an '92-'96 5.7 liter LT-1 block, rods, pistons and heads?
It would be interesting to see how a modern 302 with roller cam, reverse flow cooling, and fuel injection would perform vs. the old DZ 302.
Specifications
DZ-302 (4.000 bore) (3.00 stroke) (5.70 rod) (2.45 main journal) (2.10 rod journal)
L99.......(3.740 bore) (3.00 stroke) (5.94 rod) (2.45 main journal) (2.10 rod journal)
LT-1......(4.000 bore) (3.48 stroke) (5.70 rod) (2.45 main journal) (2.10 rod journal)
It would be interesting to see how a modern 302 with roller cam, reverse flow cooling, and fuel injection would perform vs. the old DZ 302.
Specifications
DZ-302 (4.000 bore) (3.00 stroke) (5.70 rod) (2.45 main journal) (2.10 rod journal)
L99.......(3.740 bore) (3.00 stroke) (5.94 rod) (2.45 main journal) (2.10 rod journal)
LT-1......(4.000 bore) (3.48 stroke) (5.70 rod) (2.45 main journal) (2.10 rod journal)
Safety Car
Joined: Feb 1999
Posts: 3,631
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From: Fountain Hills AZ
Re: Can a 302 pump out 400+ HP? (korvetkeith)
Baby LT1? Are you sure thats not a V6? I have never heard of that. Could someone confirm? :confused:
Race Director
Joined: May 2000
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Re: Can a 302 pump out 400+ HP? (korvetkeith)
The '67 version was 2.30/2.00; '68 and '69 2.45/2.10.
The 302 really doesn't need the large jounals because with only a 1.5" crank throw the small journals provide plenty of journal overlap to maintain crankshaft stiffness.
Back in the seventies a lot of F5000 teams ran small bearing bottom ends because they have less friction. They shifted at 8000 to 8200 and engine reliabiltiy was very good.
Duke
The 302 really doesn't need the large jounals because with only a 1.5" crank throw the small journals provide plenty of journal overlap to maintain crankshaft stiffness.
Back in the seventies a lot of F5000 teams ran small bearing bottom ends because they have less friction. They shifted at 8000 to 8200 and engine reliabiltiy was very good.
Duke
Safety Car
Joined: Mar 2002
Posts: 3,780
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From: Southwest MI
Re: Can a 302 pump out 400+ HP? (SWCDuke)
My cousin had/has a 68 Z-28, that he bought new, in fact his mother ordered it for him in late '67 when he was in the Army (she drove that thing, for about 1000 miles to get in broke in for him, so it would be ready to rock when he got home...... I don't think the older woman ever had it above 2500 RPM :-). Anyway, he drag raced that car for several years, we had that engie apart many times, it is a small journal crank/2bolt main engine (he did install main studs, in hopes of strenghtening the 2 bolt setup.... ). It seen very hi RPM use, 8500+ on a regular bases, never had a bottom end problem (but it was percisely balanced, and clearances were maintained optimum).
That little 302 was well over 400HP, it ran in the mid 11's (it was .030 over), had tricked up heads, a solid roller, true 13:1, 2x660 holleys, etc., but the rods/crank/block/main caps were stock GM, the original parts. He still has the car, been parked in his garage for ~22 years.
[Modified by 66427-450, 10:00 AM 10/20/2002]
That little 302 was well over 400HP, it ran in the mid 11's (it was .030 over), had tricked up heads, a solid roller, true 13:1, 2x660 holleys, etc., but the rods/crank/block/main caps were stock GM, the original parts. He still has the car, been parked in his garage for ~22 years.
[Modified by 66427-450, 10:00 AM 10/20/2002]
Melting Slicks
Joined: Oct 1999
Posts: 2,581
Likes: 14
From: Tolar Texas
Re: Can a 302 pump out 400+ HP? (korvetkeith)
Baby LT1? Are you sure thats not a V6? I have never heard of that. Could someone confirm? :confused:
Check out my story>>> Caution!!! Imitation LT1. . . http://forums.corvetteforum.com/zerothread?id=35329 :lol:
