looking for a particular headgasket

gearbanger4 · Post by **gearbanger4** » Thu Aug 09, 2012 4:23 pm

Does anyone know where I can find a headgasket that is specifically made for a .040 over bored block?

Also, if there are any recommendations as far as using a thinner headgasket to raise compression further (along with higher compression pistons, milling the head etc).

Post by **occasional demons** » Thu Aug 09, 2012 9:49 pm

If you are milling the head, just mill off what ever you think you can get with a thinner gasket. Yes the inner layers have been removed to make the gasket thinner, but if you are milling the head anyways, why sacrifice some reliability/integrity of the gasket.

As for .020" per side, I doubt you will see a problem with the oem spec bore in the gasket.

Edit: If you are worried about the head, a 2.0 head was milled 0.070" on the other .org, without any issues. But that was with near stock pistons IIRC, so you may have a problem if you try that with a high dome piston.

The best way is to just get pistons at the C.R. you want to begin with.

gearbanger4 · Post by **gearbanger4** » Fri Aug 10, 2012 9:34 am

thanks for the input

BTW, I did find A headgasket with 90mm bore, but it is very expensive!
http://www.raceeng.com/p-8808-phuzion-g ... 51-ea.aspx

to add a little more to my specific build.

I already have the 10.5 drop in .040 over JE pistons. Instead of selling them to purchase 12.5 pistons, I was looking to just get as close as possible to 12-13 to 1 CR using the pistons I already have (which apparently are like 11.3-.5 CR in a SOHC anyway as I understand using online CR calculators?) I figured I would mill the head or use a different gasket to get the desired higher compression.

I wasn't really thinking about clearance problems, unless that has been know to happen?

The OEM bore size on the stock headgasket probably won't cause me any problems as you say, I just wanted to have any of the gasket material in between the combustion chamber and the top of the piston at TDC.

INVUJerry · Post by **INVUJerry** » Fri Aug 10, 2012 3:01 pm

From what I understand Felpro's are ready for .040" over. Also, not sure if they make one for a sohc already but Cometic will make you a thin headgasket, with an overbore if you need it.

You could also try taking apart the Felpro and remove one of the middle shims to raise compression a little.

Post by **occasional demons** » Fri Aug 10, 2012 3:07 pm

Clearance issues would be mainly high lift long duration camshafts.

Depending if the piston edge goes above deck or not might be another issue.