Thread: Help with SBC cam selection

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Welcome to CHR:

You may have a couple conflicting goals with your cam in this vehicle. While I like the Vortec heads as they breathe “ever-so-much-better” than you stock heads you’ve still got a truck and the weight associated with such. With the 3.73 gears and 31” tires you’re close to 3.40 equivalent gearing. With the stock stall converter, you don’t want to go too big on the cam or you’ll be very disappointed. Stay with something that has specs close to the following:
- Advertised Duration (Int/Exh): 262/272
- Duration @ .050 (Int/Exh): 204/217
- Lift (Int/Exh): .420/.442
- LSA: 112

Summit Racing SUM-K1102 is a kit for $90. There are others from Lunati and others, but stay close to these specs unless you want to go with taller gears and a higher stall speed than stock converter (2400RPM). You’ll have a slight difference in idle, but still have good vacuum and it will pull well off idle through 4500RPM.

You did not mention what you're doing for carb and intake - I'd go with a Performer RPM and AVS 1805, 650cfm Edelbrock.

Have fun with you project and let us know what you decide.

Regards,
Glenn

Originally Posted by glennsexton

Welcome to CHR:

You may have a couple conflicting goals with your cam in this vehicle. While I like the Vortec heads as they breathe “ever-so-much-better” than you stock heads you’ve still got a truck and the weight associated with such. With the 3.73 gears and 31” tires you’re close to 3.40 equivalent gearing. With the stock stall converter, you don’t want to go too big on the cam or you’ll be very disappointed. Stay with something that has specs close to the following:
- Advertised Duration (Int/Exh): 262/272
- Duration @ .050 (Int/Exh): 204/217
- Lift (Int/Exh): .420/.442
- LSA: 112

Summit Racing SUM-K1102 is a kit for $90. There are others from Lunati and others, but stay close to these specs unless you want to go with taller gears and a higher stall speed than stock converter (2400RPM). You’ll have a slight difference in idle, but still have good vacuum and it will pull well off idle through 4500RPM.

You did not mention what you're doing for carb and intake - I'd go with a Performer RPM and AVS 1805, 650cfm Edelbrock.

Have fun with you project and let us know what you decide.

Regards,
Glenn

Thanks for replying I forgot to say the truck is a 4 speed manual does that make much of a difference