Headgasket To Fit 86.5Mm Bore

[gobiz]

Hi, sorry for noobish question but have done a little search but no conclusive answer.

My block is being bored at the moment to fit 86.5mm forgies.

I've looked around and available headgaskets seem to be 87mm and 88mm.

Which size do I choose?

Thanks

[Tangles]

get the 87mm mate

cometic street pro is a good kit, can get the whole top-engine gasket kit for under $300 delivered, ebay

includes Multi layered steel head gasket

Im using 1mm oversize head gasket on both my Rb25 and Rb26 engines, stock bores

[Amoreuxi]

Do consider the permaseal MLS gasket.

As good as the cometics.

They also do inlet etc gaskets for the rb's.. The inlets look a little better than the factory stuff but factory is better on the exhaust side.

The few times I've replaced my inlet gasket (just removing head playing with restrictors etc) i've found the factory inlet gasket appears the be leaking 'slightly', the permseal doesn't appear to have, its a little chunkier on the metal embossed seal.

I've never machined the inlet/head face so it may simply be that but the permaseal inlet gasket definitely sorted the very very slight seep i had.

The Permaseal MLS i grabbed from motor traders for a little over 200. the inlet/exh gaskets etc was dirt cheap. $100ish all up from memory.

Edited January 21, 2011 by Amoreuxi

[Duncan]

I've just used a permaseal one, and have used cometic in the past. no sign of trouble with either

[Char]

mine is 86.5mm cant remember what thickness the head gasket was atm, think it was cometic metal headgasket mulit layer VL Turbo one

got compression of 160 on all 6 --pistons are 8.5:1

can ask my tuner if u need

Edited January 25, 2011 by Char

[mattis96]

can someone please tell me asap if you can you use the rb25 head gasket with no dramas on the rb30 block, have searched but no definite answers i could find, thanks

[Char]

no you cant

[JonnoHR31]

can someone please tell me asap if you can you use the rb25 head gasket with no dramas on the rb30 block, have searched but no definite answers i could find, thanks

need rb26 or rb30 gasket