Headgasket bore size - Clyinder bore size question

[jdbecks]

Hello all,

Im currently In the middle of my 3SGTE engine rebuild and through accident I had ordered the wrong size head gasket,my bore size is currently 86mm and will be bored out to 86.5mm, The HG I have should be for 86mm bores,

I need to measure the inside Diameter of bore of the HG to see exactly what size they are, as Im told they are always slightly bigger than the application used for..is this true?

will it be ok to fit it?

cheers

[oakdale]

86.5 mm is a 'standard' oversize for these engines, so the gasket should not be a problem.
As you say, most gaskets are slightly larger in bore, to allow for engine reconditioning.

[stevieturbo]

jdbecks said:

Hello all,

Im currently In the middle of my 3SGTE engine rebuild and through accident I had ordered the wrong size head gasket,my bore size is currently 86mm and will be bored out to 86.5mm, The HG I have should be for 86mm bores,

I need to measure the inside Diameter of bore of the HG to see exactly what size they are, as Im told they are always slightly bigger than the application used for..is this true?

will it be ok to fit it?

cheers

Measure it first, but more than likely it will be fine.

[peterguk M500]

HKS head gaskets are very precise in their measurements. We're putting together a 3S-GTE 2.2 stroker using sleeved bores and 87.5mm custom pistons, (and a GT35R bolted on the side) . 87.5mm gasket was too close for comfort, so using a 88mm gasket instead.

Edited by peterguk M500 on Saturday 1st August 18:32

[Boosted LS1]

Place the gasket onto the engine and locate it on the locating dowels and take a look. You mustn't have any of the gasket overhanging the bore otherwise it'll get burned and be a source for detonation.

[tristancliffe]

Well, a source for pre-ignition rather than detonation, but we get your point.

[odyssey2200]

I once rebiult a Ford D series engine and the Parts dept supplied the wrong size gasket.

Being young and trusting I didn't check and the first I knew was when I had a horrible tapping noise as the piston kissed the metal binding on the gasket.

Cue me working late to do the whole job again