I was wondering if anyone has had any trouble running 1mm oversized valves with a cometic head gasket. We clayed the motor with the honda gasket on it and it was perfect. WE then took off the head to switch to the COmetic head gasket and now there it piston valve hit. COmetic told me they shold not hit but obviously they do does anyone know the thinkness of a stock Honda head gasket compared to the Cometic gasket? Any help would be great considering im 16mins to late to call COmetic and Honda now.

 

are you sure you have the cams in the same place when testing both? This sounds very odd considering cometic doesnt make a thinner head gasket for h22s, and it would be much more likely to hit with a honda headgasket, because when you were claying that headgasket would already be compressed

 

In most cases the valves will hit the exaust valve pockets, by scraping the edge. 1mm will require fly cutting the valve reliefs out a bit. If you are careful, you can do this yourself with a dremel. Make sure to mask off the entire block so metal particals don't get everywhere.

 

do you all know how thick the head gasket is(stock one) we just found out the COmetic does make 3 diff thickness of head gaskets for the H22a4 being .030 .040 .054 Somehow we ended up with the shortest so i thck that is the problem.

 

.030 is stock i was just on the phone with cometic today and thats what they told me.

 

i do not understand if .030 is stock they why did the valve/piston hit with the cometic gasket but not hondas? If they are both .030 is should not matter but it does, i just dont think .030 is stock but i could be wrong im out of ideas ????

 

if u are having vavle clearnign problmes from only a different gasket, i think you have bigger problems than the gasket thickness

 

Problem is that .030 Cometic gasket was put it and valves hit piston, Honda gasket was used and everything was perfect. Thats the problem man. They are just a 1mm oversived Manley valves with stock cams and Wiseco pistons...So anyone know the stock heade gasket thickness for sure ?

 

anyone actually know the thickness of the stock head gasket for sure ?

 

I measured one out to .034" thick...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point6 &raquo;</TD></TR><TR><TD CLASS="quote">I measured one out to .034" thick...</TD></TR></TABLE>

Really? I just measured one (OEM) out in the garage and got .026" but that was not the raised areas, just the thinnest part. I figure with headstuds/bolts torqued you will crush the gasket down to the thinnest part.

the Pirate

 

Hey Pirate, did Rick ever get any specs off of your pistons?

 

i just dont understand why it would hit with the cometic head gasket if its .030 and thats about the same as honda cometic says

 

So after tearing down some of the motor today we find that it was a valve that was stuck The number 2 exhaust valve keeper was stuck therefore hitting the piston. So now were puttin here in Monday first thing! Should be a nasty seyup after break in and tuned!! Thanks guys