Ok I have an 81mm bore block and apparently ive been running an 82.55mm headgasket (copper).

So is it normal to run a HG thats larger than your actual bore?? I need to find a new copper HG and i cant find any 81mm bore but the previous kind i used was 82.55mm bore and im wondering if i should just use that or if thats why the gasket blew so soon....

Can I use an overbore headgasket, if so what the highest overbore i could go? I want to use an SCE Pro Titan Copper but its like 84mm or larger...

 

if you contact sce they can custom make one in any bore size you like..

other than that I belive the stock OEM honda HG is 81.5mm stock..

 

over bore gasket will just lower your compression a tiny bit, why are you running a copper gasket, use a stock one

 

i have SS orings machined into my head, I HAVE to use a copper headgasket...

I will contact SCE thanks .. stock b17a1 bore is 81.55, not 81mm?

Im calling flatout omorrow so ill call SCE as well... the old gasket was SCE but it was definitely overbore...

 

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