Stop in for a cup of coffee

Mopar Tim said
From a purely performance view they are correct. But in a real life setting. What ever you can get will work..

So now, next stupid question:

the felpro is .039 compressed, with my block and pistons, puts me at 10.08 CR.

Cometic makes a MLS in a 4.410 bore that compressed is .027, which bumps my CR to 10.35. Is there any reason not to go with the cometic? I’ve heard rumors that a cometic requires certain block prep.

I plan to measure valve to piston clearance to be sure, but just wondering is the added .27 CR would be worth it performance wise