Head Gaskets for correct quench - Third Generation F-Body Message Boards

shuanm · 11-10-2009, 07:01 PM

I have a friend that owns a machine shop, but it isn't the type of machine shop that rebuilds engines. I borrowed a depth caliper from him and found out that each of my pistons are .030 to .031 down the bore. Should I use a felpro 1094 with a .015 compressed thickness, or is there a better gasket that I should consider to get my quench correct? I intend to use this for a street car and don't know if quench is important for that, but would assume it would be to reduce detonation..

vetteoz · 11-10-2009, 07:07 PM

Quote:

Originally Posted by shuanm

I intend to use this for a street car and don't know if quench is important for that, but would assume it would be to reduce detonation..

Quench is very important especially if you are running a decent CR.

http://racingarticles.com/article_racing-10.html

http://www.camaros.net/forums/showthread.php?t=124935

http://www.popularhotrodding.com/tec...eze/index.html

shuanm · 11-10-2009, 09:03 PM

With the 1094 it should be around 9.9:1 static with my speedpro h345ncp pistons and 67cc Iron Eagle SS heads. Is the felpro 1094 a good gasket for this application, or should I go thicker and lower the CR a little? Will those gaskets hold up to daily driven? Maybe 10K to 15K a year??

bjankuski · 11-11-2009, 10:10 AM

The 1094 gasket will be fine for every day use.

shuanm · 11-11-2009, 05:21 PM

Thanks a lot for the help. I will get those on the way, and get my Z back on the road.

Viprklr · 11-12-2009, 05:11 AM

It has been suggested on here to spray copper spray-a-gasket on both sides of the 1094 before installation to help with the sealing.
I did and have had no issues with leakage.

Just food for thought.

shuanm · 11-12-2009, 08:09 AM

I thought the 1094 had a rubber coating. Do you spray it over that?

shuanm · 11-12-2009, 11:39 PM

Hello?? Do I just put the copper over the rubber coating that comes on it?? I've never used steel shim gaskets before.

Viprklr · 11-13-2009, 05:21 AM

Yes.
Added security.

Remember, technically you're supposed to have perfectly flat surfaces to use this shim gasket or it won't seal.

shuanm · 11-14-2009, 08:54 AM

The one I took off was a steel shim. All of the others I saw were way too thick to get a decent quench. Should I throw the quench idea out and use a .039 thick gasket? I just want to do the right thing.

Viprklr · 11-15-2009, 07:02 AM

Do the right thing and shoot for quench.

shuanm · 11-19-2009, 06:40 PM

Thanks for the info.

Sonix · 11-20-2009, 11:19 AM

If you had a steel shim before and you had no leaks, you should be fine, but typically you'd put a long steel straight edge across your heads and use a .002" feeler gauge and see if you find any dips. Might be worth verifying first?

shuanm · 11-20-2009, 05:08 PM

Oops. No one suggested that yet. They are on now, so I guess I'll just have to hope for the best. It was a crate engine and came with steel shims, but I bought brand new heads. I'll know in a couple of days. I'm not scared to do it over again though.