dparker

Your intake ports won't be changed much with just .040 taller head gasket. Probably about a 1/32 difference in alignment. What I'll have to do is check to make sure my intake doesn't bottom out on the ends. I only had .015 when the head gasket was .040. I had to mill about .030 off the ends so that I could run a 1/16 intake gasket. It may allow me to run the 1/8" thick intake gaskets. I'll just have to wait till I get them on to find out for sure.

zipper06

Cosmetics work, period and they come in all thicknesis, i personally use SCE copper gaskets but the second choice would be Cosmetics, they cost about the same on price. I have a lot of friends who use cosmetics and they are happy with them.

JMO

Zip.

russ67chevelle

my engine builder used them in my 572 nitrous motor,no probs sofar

PAR

We use cometic or mls gaskets on 90% of our engines we build.

moretraction

How did you come up with .005 PTV after pulling your heads?

TheRabbit

Great gaskets!!

radicalz

I would recommend them too....best i've used

moretraction

I asked in my earliar post, How did you come up with .005 valve to piston (ptv) after pulling your heads? Is .005 valve to piston a typo? If not was this a running engine? I know these questions are off topic for the cometic gasket preference question. It looks as though a thicker gasket would not be a very good band aid quench wise, if your cam is degreed wrong you could have .005 and .150 intake and exhaust clearanece or the opposite or???? Your number is not something to throw a gasket at IMO.

dparker

I have a 15:1 535BBC that ran a 7.86 at 173.54 at 7100ft of adjusted altitude with a 4:10 gear and 106 circumferance tires. I had just ran a 5.07 at 137 when i killed the car and heard a little poot. I ran a leak down and found that cylinder 3 and 5 had 25%. When I pulled the head off I could see head gasket starting to go, on cylinder 5 and 8 they had the carbon rubbed off the pistons in a 1/8"x1/4" mark, but not down to the aluminum. I put the old gasket back on and retorked the heads checking with clay I had .020 on 5 and 8 and .025 on the rest. I presumed that the rocking of the piston made the difference or maybe those two valves were adjusted a little tighter. Either way I decided to add alittle more clearance so I went with a .040 thicker head gasket. The .005 clearance was what I projected after seeing how the carbon was scuffed by the valve. The .005 difference between the cylinders is from the fact the pistons were fly cut and the edges were rounded for better flame travel. It looks like 2 pistons weren't quite rounded as much as the rest. Making the clearance alittle different. I decided to go with thicker head gaskets instead of grinding on the pistons while they were in the engine.

ashbros

I have had great luck with cometic head gaskets, I have reused them more than once

Not for use with oringed blocks. for Oringed blocks I used the Titan Copper Head Gaskets