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Discussion Starter · #1 ·
Hey Guys

I am getting a set of AFR 180's for my SBC 355. My issue is my pistons sit .025 down in the whole. If I use the gasket AFR recomends(felpro 1003) Ill end up with a quech of .066

I asked AFR about using .015 rubber coated steel shim (Felpro 1094) The said that gasket hangs out in the combustion chamber a little.

I know the best thing to do would be to zero deck the block but it is already assembled and I dont want to have to do that if I can avoid it.

Anybody using the felpro 1094 on an AFR head or have any suggestions??
 

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head gasket help

The Fel-Pro 1094 is a steel shim gasket with a rubber coating. It is recommended that heads and block be very flat. Some even go as far and use studs for fastening the heads. I ran into the same problem with my big block. I thought about using steel shim gasket also. I decided to have the block decked to .005 and used the .036 Cometic head gaskets. They have a good rep and are re-usable. I have too much money tied up to take a chance on something like blowing head gaskets.
 

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Discussion Starter · #3 ·
Head surface should be good as they are new. The block im not sure. It is a fresh rebuild that I bought from a freind of a freind. It looks like the deck was surfaced so it should be flat.

I see there is mixed reviews when I read online. some say they run a steel shim with an AFR head with no issue and some say not to do it.

I really dont want to break it down and have it decked if I can avoid it. I went out tonight and measured again (was in a hurry the first time) the pistons are more like .020 in the hole.
 

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GM head gaskets

Those head gaskets will not work for you. Your bore is 4.060. You can call Cometic and custom order your head gaskets. You would need .027 compressed thickness and 4.060-4.100 bore.
 
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you can use felpro Q 1094 because of the rubber that coats them i used them with my AFR heads and was told they wont work but they do work and its the same bore as your 355 so i can tell you from experience they will work.

its a .015 quench thickness gasket so its the best way to go
 
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