okay, i just ordered an 84.5mm GE HG. I had forgot that my block is actually bored to 84mm..

question is, is it okay to run the 84.5mm HG or should i return it and get the proper HG size, ie 84mm

this is going to be goin on my GSR turbo motor

 

Send it back and get the proper head-gasket. There no way that this one will seal and you'll just blow right through it.

 

i was thinking the same thing.. but the guy at Lightningmotorsports said that I would be okay to use it even though its .5 mm over.. i think that guy's smoking some crack to tell me that..

 

Im with c speed - it would not seal- go tell your lightning motor sport guy hes a dolt and needs to go back to school

 

Its fine.

A lot of people here seem to talk out of there ***. Its one thing to suggest that it might not work, its another to say it won't work as a fact.

If it makes you feel any better, OEM 1.6-1.8 are 82mm.

 

yes agreed, people do talk out of their ***.....damn internet mechanics

Personally id return it and get the proper size, but you shouldn't have any problems if you do decide to run it

 

OK...I can show you pix of what will happen if you run that gasket. We made the same mistake on a b20/vtec two years ago and it ruined an ITR head. Please, Im speaking from experience.

RETURN IT AND GET THE CORRECT BORE!!! Enough said.

 

0,5mm larger is ok, but smaller hg than bore is bad... You will blow it straight away...
u r fine with 84,5mm HG on 84mm

I was in this doubt earlier, but Earl said no problem.... Still works...
But of cource, the right size is the best...

 

Normal




84.5 mm HG used on Boosted b20.



Take your pick of what you'd like to have.

 

looks more like detonation to me..

 

No, Its not. Its what I've been talking about.

 

I've chimmed in with my "EXPERIENCE" with this subject so Please just return it and get the correct bore HG.