I'm building up my 305 TPI. It's been bored .30 over, forged crank and pistons, Edelbrock intake, headers, and upgraded airflow and injectors. Was just wondering if anyone new if I could put these headers on my engine. The casting number # is 3973370 they have a 64cc chamber with 1.94/.150 valves. These were over the counter heads for a 350 and were manufactured on Canadian Pontiacs around '69 or '70.

 

1.94/1.50 valve heads should have no problem fitting on a 305. Do the heads have accessory bolt holes. Without them, you won't be able to attach your alternator etc without fabbing up some other sort of mounts.

 

Wow. I can't believe I missed that. They only have one hole on each side. I guess I could have the other holes drilled in right? Its these or a set of 416 heads. The 416 heads are ready to go out of the box minus a P&P job whereas the 3370"s would need the accessory holes drilled and then a whole head job being they are bare bones. Wondering which one would flow better. The 3370's are $200 bare and the 416's are $180 ready to go stock with 1.94/1.50 valves and these heads have been fully machine with 3 angle valve job and come with new valves and springs.