Help with cam selection 383 SBC
06-25-2005, 02:14 PM
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Location: Edmond, Ok.
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Cam selection 383 SBC
Currently running a 383 SBC with Vortec heads (2.02 &1.60) with substantial port work.
Comp hydraulic roller:
224/230 @.050
145/151 @.200
112 LSA
3.0 overlap @.050
54. overlap @seat
10.0 static CR.
Stainless marine exhaust. This motor pulls hard to 5400rpm, idles well at 800rpm in neutral and idles decent at 650rpm in gear. No Reversion issues.
I've built a new 383:
AFR 195 heads
10.2 static CR.
My question is cam selection. I want a "little" more cam, but still want decent driveability and not worry about reversion.
"Ultradyne-Bullet" cams have several grind profiles that are a step up from the Comp profile. I can have these ground on any LSA. How much is too much duration @.200 or too little?
How much overlap can my exhaust handle?
Help!!!
Comp hydraulic roller:
224/230 @.050
145/151 @.200
112 LSA
3.0 overlap @.050
54. overlap @seat
10.0 static CR.
Stainless marine exhaust. This motor pulls hard to 5400rpm, idles well at 800rpm in neutral and idles decent at 650rpm in gear. No Reversion issues.
I've built a new 383:
AFR 195 heads
10.2 static CR.
My question is cam selection. I want a "little" more cam, but still want decent driveability and not worry about reversion.
"Ultradyne-Bullet" cams have several grind profiles that are a step up from the Comp profile. I can have these ground on any LSA. How much is too much duration @.200 or too little?
How much overlap can my exhaust handle?
Help!!!
Last edited by LMAC; 06-26-2005 at 12:03 PM. Reason: change heading
06-27-2005, 06:04 AM
#2
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Re: Help with cam selection 383 SBC
The cam you say you already have looks a lot like the GM "HOT" cam p/n 12370846. GM installs this cam in their ZZ383 crate motor and it pumps out 425 hp @ 5400.
This cam is one of Dennis Moore's recommendations from his book.
Hot cam specs:
Duration @ .05: 222/230
Lift w/1.5:1 rockers: 509/528
LSA: 112
This cam is one of Dennis Moore's recommendations from his book.
Hot cam specs:
Duration @ .05: 222/230
Lift w/1.5:1 rockers: 509/528
LSA: 112
