KickboxingCrazy

iTrader: (15)

can someone give me a bit of help with the head gasket thickness i need for the current car im working on. its a 1997 short block with STi 5 heads.

using multi layer steel.

thanks

FB Tuning

iTrader: (30)

what pistons?

KickboxingCrazy

iTrader: (15)

its a standard engine. did the wrx and sti's have diferent comp pistons for that year, i thought they was 8:5:1

FB Tuning

iTrader: (30)

From memory, the 1997/8 heads have a chamber volume of 46cc, the 99/00 has 49cc

KickboxingCrazy

iTrader: (15)

and what thickness did they use standard as apose to the STI v5?

joz8968

iTrader: (13)

I think a std STi 5/6 engine uses thin 0.6mm HGs. But it all depends on your STi 3 (or 4) pistons as mentioned.

Is a 3cc lesser chamber volume really enough to significantly increase the CR, and therefore thicker gaskets required? Don't know?

KickboxingCrazy

iTrader: (15)

i suppose though if thats the case i cant use any less then 0.55 mm gaskets as they dont exist so should be fine with that thickness as it should run a lower comp due to the larger cc of the 5 heads.

joz8968

iTrader: (13)

Oh right, so the v.5/6 heads have more volume than the v.3/4 ones? In that case you're pretty much back to square one re the CR - so I'm sure the OEM 0.6mm ones will be fine....

alcazar

iTrader: (2)

But do check the cr if you can.

I didn't, after a head skim, and mine went pop

joz8968

iTrader: (13)

Yes, defo get a specialist's advice before choosing yourself!

KickboxingCrazy

iTrader: (15)

i aint getting a skim and all block and head standard thickness. cheers