C5Shark

iTrader: (1)

I am slowly finishing up the LS3 head install on my LS2, while measuring for pushrods I noticed that as I was working my way down bank 1, the length of the pushrod required grew by about .012" or approx 1/8th of a turn of the checker.

Cylinder 1 measured the same as every cylinder on bank 2, but across the length of the head I noticed this change.

Engine is a stock shortblock/stock cam 06 LS2 in a GTO, heads are LS3, valve job and were milled by a very reputable shop, new LS7 lifters. I did notice some variation in the valve tip height which could be attributing to what I am seeing.

While this is obviously not ideal, is this something that is "common" to the LS2 deck surface? Should I pull it back apart to reinspect?

3rdCoastPowerSports

iTrader: (5)

are you staying your heads are cut like a wedge and the top of @1 cylinder head is higher than the top of #7 cylinder head. because if that's what your saying... hell no that's not right

so from intake valve #1 pushrod to intake valve #7 pushrod there is a variance of .012"?
how are you measuring this? try using the feeler gauge method to get your zero lash measurements

outkast6991

iTrader: (34)

Varying valve tip height is the reason if you know the heights are off

C5Shark

iTrader: (1)

I measured using a length checking pushrod, and checked that by using a stock pushrod and counting the turns to get 22 ft lbs past zero lash.

Valve height is off a bit, I am measuring this with a straight edge and feeler gauge so it's just a highest-to-lowest comparison.