I've got a question about a set of SBC heads. The casting number on the heads I have are 3973487. From doing a search on www.mortec.com
I found this..
3973487....71-72....350...used on 71-72 350 LT1, 75cc chamber
my question is does the LT1 mean these came on a performance engine (corvette)?
does anyone know what size the valves are or how can I find out?
Maybe I got lucky and got some good ones.