Hi Guys,
just wonder can i higher boost when place a thicker h/gasket?

Im replacing my oem h/g to a cometic 0.51" x 86mm h/g.

But bore size is 85.5mm

Any problem for this matching?

The reason i changed my oem h/g is due to oil leak.

 

umm.....

 

Not to be a jerk by any meas but start here...
http://="https://www.evolutionm.net/...-dummies.html"

 

Are you on stock or aftermarket head studs?

 

Im using ARP head studs

 

assuming you already have a built motor. boost would typically be dependent on the fuel used. with the hg i would suggest sticking with oem.

 

OEM gasket, why would you use a cometic? The block will need to be pulled and honed to a mirror along with the head to get a good seal. The OEM gasket is good for 800+whp.

 

I see what you are saying, your thicker head gasket would give you a lower compression ratio. Boost levels are dependent on so many factors though.

 

Omg!!!
Another wrong choice

Thanks guys as ive no choice to replace my oem hg as it is leaking....

 

I agree with the others. STOP any installs and get an OEM head gasket. I don't mean to scold you, but you need to do more research before you buy anything. We need to spend our $ wisely.

 

oem head gasket will fit an 85.5mm bore.

 

+1 Mine is over bored .020 and I am using the stock gasket.

 

I had OEM also, made 500,600,700 and finally 840awhp with out a problem.

 

Yup stock hg is good up to .020 over, and my choice over the others. I see what youre saying, and theoretically yes you could run more boost, but thats not a reason to not get the stocker. And the block doesn't neseccicarily have to be pulled and decked every time because its not aluminum and doesn't warp as easy as heads do. I'd of course check it but I havnt had to re deck a block on a 4g yet, but heads yes.

 

Thanks Guys...Ive to bet my luck on Cometic now...Everything have been done...Hope everything will go fine...