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Old 11-04-2008, 07:43 PM
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Here's What I have. Need Help with Rest

Ok guys I know you are all probably watching the election results but I need help with my decision. Here is what I have to work with. Please make suggestions with what I have because it is all I got for now.

1989 Chevy S10 (inside stripped to lessen weight)
No factory glass, all lexan and plexiglass
Tubbed & Narrowed w/ Frame boxed
9" Narrowed Rear w/456 gears & Auburn Full Spool
33x16x15 Hoosier Slicks
BBC 402 (numbers say it came in a 72 Camaro)
781 oval port heads
Offy Tunnel Ram w/ (2) 600 Edelbrock Carbs
TH400 Tranny w/Transbrake

I do not know much about the motor other than it does run fine. As far as the cam specs, that is unknown too. I have to assume the motor and heads are stock because I can't afford to tear it down right now to see. I am just trying to get back to the track by next season. My question is, what would be the best cam & stall converter for this setup? I am to the point of wanting to install the tranny to get the driveline complete but I don't want to put too big a stall in nor too small a stall. My "guess" would be a 3000 - 3500 stall. What do you all think. I would like a good lopey idle with the cam. All help would be appreciated. Thanks
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  #2 (permalink)  
Old 11-05-2008, 04:59 PM
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Quote:
Originally Posted by S10 Racer
Ok guys I know you are all probably watching the election results but I need help with my decision. Here is what I have to work with. Please make suggestions with what I have because it is all I got for now.

1989 Chevy S10 (inside stripped to lessen weight)
No factory glass, all lexan and plexiglass
Tubbed & Narrowed w/ Frame boxed
9" Narrowed Rear w/456 gears & Auburn Full Spool
33x16x15 Hoosier Slicks
BBC 402 (numbers say it came in a 72 Camaro)
781 oval port heads
Offy Tunnel Ram w/ (2) 600 Edelbrock Carbs
TH400 Tranny w/Transbrake

I do not know much about the motor other than it does run fine. As far as the cam specs, that is unknown too. I have to assume the motor and heads are stock because I can't afford to tear it down right now to see. I am just trying to get back to the track by next season. My question is, what would be the best cam & stall converter for this setup? I am to the point of wanting to install the tranny to get the driveline complete but I don't want to put too big a stall in nor too small a stall. My "guess" would be a 3000 - 3500 stall. What do you all think. I would like a good lopey idle with the cam. All help would be appreciated. Thanks
Can someone help me here?
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Old 11-05-2008, 05:24 PM
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I don't know much about BBCs, but maybe can help a bit.

Do you know what your compression ratio is?

I would start looking at cams with at least 230 degrees of duration at .050, maybe up to the mid 240s. If your compression ratio is low I think a cam on a 108 LSA could help.

Call a few cam companies they know some stuff!
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Old 11-05-2008, 10:21 PM
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because of your limited compression and lack of rear end traction I would go with a 2500 stall, it'll help keep the tires planted on the launch.
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Old 11-05-2008, 11:03 PM
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You should really look for some closed chamber large oval port heads. Using 781 heads on a 402 is almost impossible to make decent compression without having to use mega dome pistons.
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