i have a 99 5.2 and was wondering how much the heads have to be shaved to go from 9.1 to 10.0 compression and if the stock push rods would be fine?

 

also should I keep the 5.2 or swap to a 5.9 cause i noticed that there really isnt much of a hp difference in both.all I plan on doing is getting the compresson up to max on pump gas(10.1?), add a cam and matching springs, 1.7 rockers, headers and to do the kegger mod for now.I plan after to add a tb, computer flash and what ever else is needed to make it run good after all the mods.

 

Bumping the compression also decrease valve-to-piston clearance, making running 1.7's harder.

 

yeah I was just thinking that,my cam wont be more then a .530 lift

 

my motor smokes at start up and when it gets hot (220 degrees) so i was gonna take the heads off and do a valve job.whats the lowest in thickness of head gaskets i can run and what would the ratio be?

 

These heads already have issues, shaving the head to get to 10.1 is not the way to go. Look at new pistons instead. As for what else is needed that would be a good list and an expensive one.

 

ive heard on the 5.9's they crack.I was trying to avoid on pulling the motor cause its still strong

 

there is little difference in rated output of those two engines because the 18r has a more aggressive cam than the 60...

that means more lift, and longer duration..

with 1.7:1 rr's, that lowers the tolerance even more..

shooting for greater compression is one way to go about it for sure- another way, though, is to put better flowing heads on it all together.. it's said that every 10cfm's account for one pony.. you could buy ported heads, gasket match the intake and exhaust, feed it with a bigger TB and let it breath with a less restrictive exhaust and get the same results.. doing it like that and keeping similar compression to stock allows for better/safer results, as it doesn't put the engine in as much danger during pre-det events.. and we all know these engines like to pre-det if not tuned and fueled right.. ..

 

5.2, 5.9 they all crack. Look at some type of after-market head, there are a few out there that have a thicker deck and better flowing cooling ports and better flowing runners. Still strong, have you doing a comp test or leak down test? If so numbers would be nice.

 

didnt do a compression test yet.