Cometic Head Gaskets?

eh2_Erik · Post by **eh2_Erik** » Tue Apr 10, 2012 3:00 pm

portenio78;291510 wrote:you'll be fine with a stock OEM gasket. I too am 81.5 and 700whp no problem.

So you can get 81.5mm OEM head gaskets?

Waffles · Post by **Waffles** » Tue Apr 10, 2012 3:16 pm

eh2_Erik;291523 wrote:So you can get 81.5mm OEM head gaskets?

The OE head gasket should already at 81.5 mm. I will measure when I get home to be sure.

eh2_Erik · Post by **eh2_Erik** » Tue Apr 10, 2012 4:41 pm

Waffles;291525 wrote:The OE head gasket should already at 81.5 mm. I will measure when I get home to be sure.

Oh really? I was unaware of this lol. I guess i'll measure the one i have at work too.

If thats the case, would it be ok to use or would i need an 82mm one?

bks · Post by **bks** » Wed Apr 11, 2012 12:27 am

You can use a stock 81mm gasket on 81.5, wont cause any problems. I think thats what portenio was getting at.

On my first LSV I used a cometic. I leaked oil around the entire engine. Could have been because the block wasnt square, the head wasnt straight, who knows. I ended up putting on a felpro and had zero issues, lol. Same engine, everything remained the same aside from the gasket.

eh2_Erik · Post by **eh2_Erik** » Wed Apr 11, 2012 2:09 am

I've been reading more, everyone says stock head gaskets are good for overbored cylinders. Some say they're good for up to 82mm or even 83mm. I think
I should be ok for 81.5mm.

Thanks for the feedback, I would've never searched if the stock gasket would even fit.

Waffles · Post by **Waffles** » Wed Apr 11, 2012 3:32 am

I just measured the 3 I have here and they are all just a hair over 81.5 mm

eh2_Erik · Post by **eh2_Erik** » Wed Apr 11, 2012 4:42 am

Waffles;291615 wrote:I just measured the 3 I have here and they are all just a hair over 81.5 mm

I read that they're usually 81.75mm so that sounds about right.