LSXHawk

iTrader: (27)

I plan on running a trex cam in my ls1 motor. my question is how much can i shave off my ls6 heads to lower my compression with out having any issues with ptv clearance?

A.R. Shale Targa

iTrader: (2)

Doesn't Thunder Racing market that cam ?? I'm sure they know but IIRC
it only fits safely with no milling and stock thickness head gaskets.

Ws6kid.

Why don't you mill the heads and just fly cut the pistons to make clearance.

studderin

iTrader: (28)

I wouldnt cut them at all or, the min clean up (2-4) if you have to cut them. Most of the time on stock longblocks when you take the heads off theirs slight non affecting, valve contact marks. so......

LSXHawk

iTrader: (27)

I know I could ask thunder but I wanted to see if anyone actually has done it. I wanna raise my compression and to try and squeeze some more hp out of it but wasn't sure how much I can have them cut

slamminjim

iTrader: (6)

Milling the heads raises the compression. The T-rex is a pretty tight cam
With stock heads from what I've read. I would not shave any without flycutting
The pistons.

LSXHawk

iTrader: (27)

lol yeah I ment to say raise my compression.

studderin

iTrader: (28)

Mock it up and see, but its less then anyone is going to recommend you to run. The internet/magize .100-.080 is "safe". Int. 12-15*ATDC gets down to under .050, I dont have note right here but thinking its .038...? I'm thinking remeber?
But The stock longblock, valve train style stuff is alot different then a race engine setup with valetrain delfextion for PTV and heat changes, so you can get away with a LOT more then you think, with good valvetrain (not what you have). I've see stock motors (m6 mostly) with stock cam, and that huge PtV "mockup clearance" hit. If you want the power, mill the heads for the target CR. And flycut your (stock?) pistons, you can cut them .120 deep and never have any problem with that. Your knock the lands off them or melt them with a poweradded, before anything from happening form a strength loss if your worried about that. It will change the bob weight but thats not gona kill anything, the valvetrain will still before rpm.