Originally Posted by elmor353
I am running a 78 440 in my pickup. Right now it has 516 heads on it, a cam of unknown origin,( perhaps it's an rv cam) and it runs fine. I am about to pull the engine to replace some seals and swap in a fresh Summit #6400 cam that is 214/224 duration at .050, with a lift of .445/.466. Basically a factory style Magnum cam. I've heard that I would be better off using an open chamber 452 head, rather than using the 516. The engine is a low mileage motor home mill with the low comp pistons. I would appreciate constructive thoughts on this. Thanks.


You need the closed chamber heads NOT the open, if you are wanting to change heads I would get some Stealth heads, they flow better than what you have & have closed chamber, cant rebuild a set of stock iron heads for what the Stealths cost

Last edited by csk; 09/25/20 08:24 AM.
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5