Stocker build

[Bob Shaw]

Originally Posted by oldskool

According to the Class Racer Info site, the 2 engines have different heads.

http://www.classracerinfo.com/Engine...5&MAKE=Pontiac

The 265hp engine is allowed 90cc heads. The 290hp engine is allowed 68cc heads. That's a lot of compression difference. Also, the 290hp engine is allowed a cam with more intake lift. Not sure how much power difference those 2 items would make. Would the difference be 25hp ?

Anybody have an educated guess ?

The natural classes would be O/SA and Q/SA. That's .60 difference in the index. I don't think the 290 engine would be that much faster. You could always change heads and see how much difference that makes. The cam wouldn't make much difference.