Ok i got 83.5mm pistons in my gsr motor right now and its o-ringed.Im going to bore it to 84.5mm.So my question is when i bore it over 1mm what do i do with the o-ring.If you look at the pics,when i bore it over the piston might have a little gap between the top of the piston and sleeve when its at TDC.Im i wrong?What should i do?

 

84.5 in a stock sleeve?

 

Nope the motor is re-sleeved already.

 

What gasket are you gonna use? Do you know where to get a head gasket for 85mm pistons?

 

I think you get stock gaskets made for 84.5mm bores.I think imort builders can get them along with some other companies.

 

They have OEM 84.5mm for OS pistons? You sure?

 

They are oem headgaskets that have been bored out to your desired size.Also please dont jack my post hehe


[Modified by J2turbo21, 8:28 AM 3/8/2003]

 

Hehe, ok goodluck with your question.

 

bump

 

why are you gonna bore it out??? how deep are the o ring lands? and what kinda comp are you running?

maybe have the lands welded/filled then machined, then reringed after


[Modified by joshwhe, 10:18 AM 3/10/2003]

 

Yea I've heard of overboring OE gaskets and for the most part I think I would like that... I use an OE gasket any time I can... To me they just seem like they seal a lot better than aftermarket.. From the look of your motor and being o-ringed I assume that you are gonna be running high boost and for that I would go with a Cometic headgasket... That's the only time I will not run OE.... (o-ring+big bore+high boost) Why do you wanna go up to 84.5?? looks like you've got a pretty good high boost setup As joshwhe said you could probably just go up to 84.50mm and then o-ring it again... Good Luck... Peace

 

IM going to 84.5 cause im going all motor now.IM just wondering if it will cause a problem.