Can I use OEM headgasket with bored block?

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Aug 22, 2012, 02:11 AM

My03evo

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Can I use OEM headgasket with bored block?

Just had to get my block bored out 20 thousandths aka .5 mm. Planned on using the stock evo 8 OEM head gasket. Can I still use this head gasket after being bored 20 thousandths over?

If not, anybody wanna buy an oem HG?

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Aug 22, 2012, 02:28 AM

RSMike

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they are fine up to 1mm (40 thou) overbore.

they are about 86.1mm bore diameter.

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Aug 22, 2012, 07:31 AM

okevolutionVIII

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Quote:

Originally Posted by RSMike

they are fine up to 1mm (40 thou) overbore.

they are about 86.1mm bore diameter.

+1

Even OEM pistons or engine rebuild kits are sold with 20-40 overbore sized parts to be used with the original block and/or crank that has been machined so the stock head gasket is good up to that size.

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Aug 25, 2012, 01:36 AM

My03evo

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Nice Niice..good to hear I won't have another delay..thanks

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Feb 28, 2013, 06:28 PM

EGbeater

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Just to confirm what others have already stated, I just measured a new OEM Evo9 head gasket (not the same as an Evo8 HG) and according to my micrometer, the bores are 3.392" (86.157mm).

The thickness of the five layers (without the raised edges around the apertures) is about .040" (1.02mm); with the raised lips, it's .058" (1.47mm) but I don't know how much those areas crush down when the HG is installed.