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Warrens69GMC · 12-31-2020, 08:34 AM

Comp cam XE262

https://www.youtube.com/watch?v=tWyjDNk8dfo

Don't get the 991 heads, they will drop compression as they have 76cc chambers and your heads (should) have 68-70cc. A set of GM vortec heads would be great for this motor, but you need the Vortec specific intake for it as well.

Double hump heads can do it as well, check the valve size and cc of the chambers. You would want them 60-66cc imo.

12-31-2020, 08:34 AM	#7
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,613	Re: 1972 307 cam selection... HELP! Comp cam XE262 https://www.youtube.com/watch?v=tWyjDNk8dfo Don't get the 991 heads, they will drop compression as they have 76cc chambers and your heads (should) have 68-70cc. A set of GM vortec heads would be great for this motor, but you need the Vortec specific intake for it as well. Double hump heads can do it as well, check the valve size and cc of the chambers. You would want them 60-66cc imo. Last edited by Warrens69GMC; 01-01-2021 at 11:52 AM.