Bought 5.7 hemi/nag1 out of a cop car. Some questions.

DionR said
Sticks in my head that 6.4 valve springs won't work on 5.7 heads. I know for the 6.4 cam swap I will do on my 5.7 I had to buy 16 of the 68277306AA valve springs.

Can't say for sure if it is an issue with the Eagle heads, or if all 5.7 heads, nor if the 6.1 has the same problem. And not sure if it is length of the valve, or the valve spring pocket that makes it a problem. Only that I read that a 6.4 cam swap on a 5.7 can't use stock 6.4 valve springs.

I have personally used stock 6.4 valve springs on a 2010+, 5.7 eagle head, but I do not know all the nuances, if there are any. And the set on my shelf are actually 6.2 hellcat springs. Came out of the same hellcat as the cam I have. Sorry, not sure why I recalled them being 6.4. Good luck either way.