MS4 install, mill heads and flycut or not?
 

My MS4 will be here this week and i plan on doing the install over Christmas...my question is, if using stock heads and bottom end, how much would it help to mill the heads and flycut? I know it would help low end with the added compression, but i have never done any flycutting or anything before. I have read the write up on how to do it and think i can...can i rent the stuff to do it or what?? Also how much should i have milled and what thickness of head gasket should i use to bring compression up as much as possible for 93 octane? Car is an 02 SS, M6, full bolt ons except EWP. Cam will be MS4, 111 LSA, PRC dual spring kit, also 4.10 gears. if i forgot anything just ask...thanks in advance for all help!!

i wouldnt recommend milling or flycutting the heads with stock pistons and stock heads and the ms4. The clearance is already pretty close with just the ms4 and no flycutting

well obviously I chose to do both as well. just couldnt bare thinking I left some easy power on the table. you can rent the tools from LG, as well as other sponsors on here IM sure. I used LG's stuff.

the increased compression will help across the board, but mostly in the lower rpms and throttle response. plus, I dont like the MS4 PTV personally. my cam is similar to the MS4, and I shaved .033" off the heads, and went with .040" cometic. cut .120" intake and .100" on the exh. side (if I remember right, maybe I should reread my sticky. LOL)

chris

How much should be shaved off of the heads to bring compression up to around 11.5:1 if i use a .040 cometic gasket?? Will this be enough for me to need shorter pushrods??

Whats the PVC on the MS4 with stock heads??

here ya go.


"(We see an average of .060" PTV clearance on the intake with MS4 cams.)" jon reynolds from TSP.
https://ls1tech.com/forums/generation-iii-internal-engine/828288-ms4-clearance-issues.html ------post 14

Yeah, I saw what TSP said, was hoping that someone else had checked it on their own for exact numbers..