Oil port mod #2 for the 4G63t

[a91talonAWD]

Originally Posted by a91talonAWD

just got the head back from the machine shop... they did not do either mod as I suggested to them(they said it was all "in spec"...) so I will be doing MOD #1... I will post if this eliminates lifter knock while still using stock lifters (not 3g lifters)

before mod#1

LIFTER KNOCK SOLVED thanks to oil Mod. NUMBER 1!!! no 3G LIFTERS...just the one with the pin holes
sorry no "after pics"...looked like the one posted at the beginning of the thread. We'll see how long this lasts only 10 miles one the newly built head...

[BogusSVO]

glad that oil port mod #1 helped you out!!

[Mph]

Sorry to bring this thread back, but I recently just had my 2g head seize up on a 6 bolt block after installing 6-bolt ARP head studs. I believe this was my problem and will be performing this mod on my next head.

[TSIfreek]

Originally Posted by Mph

Sorry to bring this thread back, but I recently just had my 2g head seize up on a 6 bolt block after installing 6-bolt ARP head studs. I believe this was my problem and will be performing this mod on my next head.

Did you have the 2g head stud holes inlarged to fit the 6 bolt studs. The 2g heads need to be inlarged 1/2" as oil flows around one of the studs feeding the head and the turbo.
If the studs bind when installing this will also restrict oil to the head. They should go in smooth as glass by hand with a T handle allen wrench.

[Mph]

I did drill the one stud hole that oil comes through to 1/2inch. The other holes I reamed to fit snug. Finally got my new head installed today and had it running for a long time with no problems!

[Vancho]

so let me get this strait, for a 6 bolt block, and a 7 bolt head, i use the 6 bolt head bolts, and i just need to re drill the bolt hole for the one that the oil goes tru because 6 bolt bolts have thicker head bolts, and i dont need to drill all of the rest right? and to be safer do a head oil port mod as well. that should be it right?

and 1/2 inch is all i need to drill it out to?

[BogusSVO]

Vancho.. ALL the head bolt holes need to be reamed to .500 to fit a 7 bolt head on a 6 bolt block