383 Stroker Cam Selection
Thread Starter
Racer
Joined: Aug 2014
Posts: 479
Likes: 93
From: Tennessee
383 Stroker Cam Selection
I recently spun a rod bearing in the factory numbers matching L-48 350 and ruined the crank. The engine needed .030 over bore to clean up and I've opted to go with a 383 stroker kit. I also have factory GM 1999 062 L31 Vortec heads that I will be using and will be getting the lift issues taken care of by my machinist. My 76 Vette is an a/c car with power brakes and I know I'm limited with my camshaft selection due to needing plenty of vacuum. I have headers with 2.5 inch exhaust and I wish to stay with my stock torque converter. I would like to get your recommendations on a great cam selection to go with my components.
Melting Slicks
Joined: Jun 2016
Posts: 2,979
Likes: 332
From: Woodinville WA
I could've sworn I heard a guideline to just figure out the attributes you want from your cam and use the typical SBC 350 guidelines for duration and just add 10 degrees for a 383.
Straub - any feelings on the SUPER simple guideline?
Adam
Straub - any feelings on the SUPER simple guideline?
Adam
Thread Starter
Racer
Joined: Aug 2014
Posts: 479
Likes: 93
From: Tennessee
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Don't need more lift. Vortec heads hit the wall at 520 lift. 12 degrees extra exhaust duration is plenty of split.
Last edited by 63mako; May 24, 2017 at 08:46 PM. Reason: typo
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
Mike
Melting Slicks
Joined: Dec 2009
Posts: 3,229
Likes: 656
From: Thunder Bay
My 383 has 222/222 hydraulic roller cam. Plenty of vacuum and torque is good. If I were to do it over, I would probably go with a little more cam, and maybe consider split duration. I think the engine could handle it.
Last edited by drwet; May 24, 2017 at 10:52 PM.
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Thread Starter
Racer
Joined: Aug 2014
Posts: 479
Likes: 93
From: Tennessee
I'm forever the conservative and I'm currently looking hard at Howard's 269/279 215/225 .455 .465 with 112 LC. Again, I have a stock converter, a/c, and power brakes. What do you guys think? Too conservative????
Le Mans Master
Joined: May 2002
Posts: 5,086
Likes: 786
From: Lebanon Township New Jersey
Too conservative, based on my experience. I had a flat tappet hyd cam in my 383, with 218/224 duration. I would get some detonation at part throttle going up hills etc. Switched to a roller with 225/232 duration, and no more detonation.
Melting Slicks
Joined: Dec 2009
Posts: 3,229
Likes: 656
From: Thunder Bay
Drifting
Joined: Jun 2012
Posts: 1,990
Likes: 183
From: Port St. Lucie Fl
I have a 234/244 .489/.510 112 in my 406 with efi and it has lots of low end and pulls great to 6k here is how mine idles
Melting Slicks
Joined: Dec 2009
Posts: 3,229
Likes: 656
From: Thunder Bay
I do not have a small base circle cam in mine. In fact I was unaware that small base circle cams existed back when I built my engine. I did know that I had to check the clearance between the cam and the connecting rods, which I did, but there was no problem.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Straub has already done the homework on this his recommendtaions are about as good as it gets. 215@050 will act and sound stock on a 383..you will probably wish youd have gone bigger.(will still run good though)
Last edited by cv67; May 27, 2017 at 11:26 AM.
Thread Starter
Racer
Joined: Aug 2014
Posts: 479
Likes: 93
From: Tennessee
The 11" of vacuum bothers me. I'm thinking I'll have a hard brake pedal.
Safety Car
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From: Youngstown Ohio
Safety Car
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