Printable View
well from what i'v found approx. .0065" milled off the head will take off 1 cc. the 243 heads have a 64.45cc combustion chamber and the 862 heads have a 61.15cc combustion chamber. So after some math it looks like it would only take around .022'' of milling to get the 243 heads to the same compresssion ratio as the 862 heads ;)
Do all the newer 5.3s that have the 243s have flat tops or what's the deal there?
yes, the 5.3 HO have the 4.8 pistons. If my milled 862's don't do it for me, that will be the next upgrade :)
if i shaved the heads .030" will the intake bolt holes still line up??
Yes...
PS, my 5.3 is the LMG with 9.9 CR and 243s.
and the intake runners will still line up with the intake ports on the heads after shaving the heads?? sorry about all the questions i'm kinda new to this and i'm trying to get all the info i can before i start spending a lot of money
243 heads suck, they won't line up after being milled, and they loose power compared to 862's....
pretty sure that was directed at me. Guys with z28s/trans ams, like putting 862's on their engines to bump compression, 243s are good heads for certain applications, but not for everybody. (you're def one of those guys who knows alot more then me, just throwing out things I've heard/found in my research)Quote:
Originally Posted by DBRODS