head gasket question - Team Camaro Tech
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post #1 of 4 (permalink) Old Mar 28th, 04, 02:39 PM Thread Starter
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I am in the process of upgrading a 350 I had laying around. This engine I thought had dished pistons in it but ended up being .030 over with cast stock type flat tops...at a whopping .053-.055 in the hole. Apparently the block has never been decked. I am adding a set of vortec heads and wanted to use a fel-pro 1094 head gasket (.015x4.100, rubber embossed steel shim) to help out on the compression, but am concerned that the 1094's may not seal well with an original deck, and 1 of the water passages in the block has some pitting around it on the deck surface, so I am also afraid this may be a problem also. It sealed just fine with a standard set of fel-pro composition head gaskets (that is what was on it). I would like to use as thin of a head gasket as possible and do not want to deck the block. Would the 1094's be ok, or would I be better off finding a thin composition head gasket? I think gm makes a .028 thick one but believe it has a stainless steel face on 1 side. I think someone had mentioned a victor gasket that was .028.

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post #2 of 4 (permalink) Old Mar 28th, 04, 09:52 PM
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Betcha a buck somebody put some "rebuilder" pistons in it & they're .020" too short. Is there a part # on top? Here's the list of GM gaskets. One has stainless on both sides.
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post #3 of 4 (permalink) Old Mar 29th, 04, 02:01 AM
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Why don't you just spray or daub the 1094's down with Copper-Cote real good and go with them. Just tighten them down in multiple passes and retorque them about three times over a couple a days after running her.

I did this to the .022" steel shims That I worked over for intake valve side clearance using a 1/4" drill and a cheap mounted stone and I ran on my 406 and it worked fine.


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post #4 of 4 (permalink) Old Mar 29th, 04, 02:01 AM
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I haven't had a problem with Felpro's steel shim head gasket. Remove the dowel pins, spray surface with WD-40, and "hone" with a Norton honing stone, a new one. Both the heads and block. Clean with lacquer thinner.

If reusing the dowel pins, take them to a bench grinder, and grind a flat spot, approx .030" wide top to bottom and install in block. This slot is an air relief to allow air in the hole to escape so block won't crack on the other side.

I myself throw away the OE pins and use .25 inch dia stainless steel rod, and make them have a .001-.002 inch slip fit.

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