milling l92s
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milling l92s i have a stock lq4 with a 224/230 .581/.592 114 cam. i just got a pair of l92 heads and want to make sure i can mill .030-.035. i will still check ptv, just want to know on the milling.
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Stock L92 combustion chambers are 68.4cc +-1.0
.030 off would make them 62cc roughly.
There are other things like like the piston over the deck, headgasket diameter, head gasket thickness etc. that go into the equation. Not every one is the same. I cc'd my heads and they came out to 62cc's, .045 cometic headgasket, piston up .010, stock lq4 pistone have a 6.7cc dish also.
.030 off would make them 62cc roughly.
There are other things like like the piston over the deck, headgasket diameter, head gasket thickness etc. that go into the equation. Not every one is the same. I cc'd my heads and they came out to 62cc's, .045 cometic headgasket, piston up .010, stock lq4 pistone have a 6.7cc dish also.
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Thread Starter
TECH Addict
iTrader: (31)
Joined: Dec 2002
Posts: 2,318
Likes: 1
From: houston, Texas
Stock L92 combustion chambers are 68.4cc +-1.0
.030 off would make them 62cc roughly.
There are other things like like the piston over the deck, headgasket diameter, head gasket thickness etc. that go into the equation. Not every one is the same. I cc'd my heads and they came out to 62cc's, .045 cometic headgasket, piston up .010, stock lq4 pistone have a 6.7cc dish also.
.030 off would make them 62cc roughly.
There are other things like like the piston over the deck, headgasket diameter, head gasket thickness etc. that go into the equation. Not every one is the same. I cc'd my heads and they came out to 62cc's, .045 cometic headgasket, piston up .010, stock lq4 pistone have a 6.7cc dish also.
Good idea: check p2v clearance with a used head gasket (if you're using the same gasket type - to simulate compressed state) using putty or something. Slowly turn the engine over to make sure. I believe that .600 lift will work with stock L92 heads (I BELIEVE!!! DON'T TAKE MY WORD AND F%*$ UP YOUR MOTOR!!!).
-TW
Thread Starter
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From: houston, Texas
Agreed. There's a lot more going on than just head cc's. And the factory heads will differ by a little bit - it's best to measure before and after doing any milling.
Good idea: check p2v clearance with a used head gasket (if you're using the same gasket type - to simulate compressed state) using putty or something. Slowly turn the engine over to make sure. I believe that .600 lift will work with stock L92 heads (I BELIEVE!!! DON'T TAKE MY WORD AND F%*$ UP YOUR MOTOR!!!).
-TW
Good idea: check p2v clearance with a used head gasket (if you're using the same gasket type - to simulate compressed state) using putty or something. Slowly turn the engine over to make sure. I believe that .600 lift will work with stock L92 heads (I BELIEVE!!! DON'T TAKE MY WORD AND F%*$ UP YOUR MOTOR!!!).
-TW
ya, they do have that whole "giant intake valve" thing going on, which definately makes them unique. i wasn't insinuating that you didn't know what you were doing, just adding my thoughts. 
I just finished my first 6.0 build with L92's. Flat top Mahle pistons which have valve reliefs cut into the pistons. I had .025 milled off the L92's. Running GM .051 thick MLS head gaskets. TSP cam, I'm at work so I don't have the exact spec's for the cam, I think its .598 intake/ .603 exhaust lift. No PTV issues.