Originally Posted by ragtop
Do stock unported 1968-71 340 heads flow about the same as the Big block 906 Heads?
Thank you.
Through the stock mani, they flow very similar which is why the 68-70 340 has almost the same NHRA HP factor as the 68-69 383.

Last edited by Scully; 05/28/21 01:09 PM.