[Ravan17]

hey guys, well fearing the worse , ( a blown hg) im starting to consider buying some studs and a hg if mine is indeed blown. this will be confirmed in a few days. Right now i have a 2.5 mm hg, which is a bit too thick for my liking. i think my compression is somehwere around 8.1:1, to low for a t61 turbo.

what would be a good thickness to go with while still safely droping the comp?

i was thinking maybe a 1.6 or 1.7 mm head gasket? wehre would i find it besides the HKS gaskets? those are too pricey.

i also considered stacking 2 gte gaskets....


and as far as the ARP studs, they are the same for the GTE and the GE blocks, correct?

how well do they hold up if i were to buy some used ones?

 

[gamimnon]

i use a gte headgasket and arp head studs. the studs are the same. they will also fit the block if they are not 1/2 inch size.

 

[1998jza80]

Stacking gaskets = no no no no no

The stock GTE gasket will work...not sure of the exact thickness or CR it gives you but I know a lot of NA-T guys use it.

 

[gixxer750ms]

stacking full gaskets= no no no

However, you can drill the rivets out and mix and match inner layers with no problems.

 

[Ravan17]

im going to do a compression test today to verify if the gasket is indeed blown, i really doubt it is b/c ive already made atleast 15 HARD pulls ever since i started suspecting it, and everything is still perfect, except engine getting a bit hot, but i think that might be my lean issue.

but if it is really blown i dont know if i should go with a factory gte gasket...or get an aftermarket 1.3,1.4, or 1.6 mm one... all i know is that im not keeping the 2.5, its killing my spool and i wont be seeing more than 21 or 22 psi any time soon anyways..

 

[Ravan17]

well, even after the comp test checked out :

150
140ish
140ish
142
141
150

im still told that it isnt a definate answer on wheter or not the HG is blown or not, i need to check for hydrocarbons in the radiator to see if it is leaking or not.


so wats the verdict, would a factory TT gasket do the trick? or should i upgrade to something a bit more thicker??

 

[bigsupraman66]

You said you have a T61 Turbo? Well, what I would do is run a Head Stud from ARP and get a Metal Gasket that is 1.2 Mil Thick. I know it's small but, the higher the compression the better the torque and horsepower even without the turbo. The Head Studs should prevent the BHG prob and anything else and run at small boost and work your way up. Too Thick of a gasket would make your ride a pig anyways. So, There's my opinion. BTW: Running High Compression, make sure to use higher octane 93 perferred. Peace!

 

[twinturbosupra94]

Best advice Ravan17 would be to yank the motor, throw a TT headgasket and TT pistons in there and

you got TT compression.

 

[gixxer750ms]

actually, you then have less than TT compression due to differences in the combustion chamber.

 

[SupraGreg]

Get a TT HG and ARPS like me!!! haha

 

[mkiv2jzgtenumber1]

All you need is a GTE Head gasket and ARP and YOU'LL never look back. Don't bother with anything else, seriously.

 

[Ravan17]

eh.... if im goin to pull the motor and rebuild it, i would go with some aftermarket pistons and build a for-sure bullet proof block, i just want a head gasket a bit thicker then stock tt, anyone know the thickness of the factory gasket?

 

[Ravan17]

greg i think thats the route im going, found a great deal on the ARP studs, but i think my gasket is good right now, just some air in the system. if it is indeed blown, i will go TT . thanks

 

[Ravan17]

greg i think thats the route im going, found a great deal on the ARP studs, but i think my gasket is good right now, just some air in the system. if it is indeed blown, i will go TT . thanks

 

[twinturbosupra94]

actually, you then have less than TT compression due to differences in the combustion chamber.

really how much of a difference? I could have swore DaveH said TT headgasket and pistons = TT compression.

 

[Ravan17]

its not MUCH of a difference, but there is a difference, he is right, there is a differnce in cobustion chambers between TT and NA heads.

 

[97 Anthracite Supra]

I run the 2.5HG with ARP studs with no problems

 

[That-Guy]

i remember when i talked to a guy at cometic a long time ago he said it was imperative that you machine the surfaces of both the head and the block to practically "glass smooth" (direct quote) before installing their hg, of course the differences in materials between theirs and a stock tt might play a role. He said that that this is the step most people overlook or simply don't do. I talked to my 2jz guru and he told me he ALWAYS sends the heads out to be machined and then simply takes a buffer wheel or something heavier to the block. Anyways, the point is that when doing this, you will be losing thickness in the head when it is machined, therefore requiring a thicker hg for the same overall gain in hg thickness that you were originally shooting for. just my 2cents, i don't know if this step is simply overkill or if it is wise to ensure that it is done properly.

 

[Ravan17]

i would never take a buffer or a polishin wheel to the block, not unless a machine shop is doing it, you can easily dig down too deep in one spot and not the another and then not have the gasket seal properly.

im runninga 2.5mm hg too know, and i probably will keep it that way unless i upgrade to a larger tubo which will spool slower w/out lower compression.

 

[twinturbosupra94]

i would never take a buffer or a polishin wheel to the block, not unless a machine shop is doing it, you can easily dig down too deep in one spot and not the another and then not have the gasket seal properly.

im runninga 2.5mm hg too know, and i probably will keep it that way unless i upgrade to a larger tubo which will spool slower w/out lower compression.

Or just get a machinist's lapping block