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Old 02-27-2003, 05:03 PM
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Post Quench

I'm putting together a 350 short block and after the 3rd piston I decide to take a look at deck height. I measure .027 in the hole on all 3. The pistons are domes so compression is not really an issue but how do I get the quench that I need? A typical gasket gets me around .060 but isn't that too much? Is there a really thin gasket? PLEASE don't tell me that the block needs to be decked!!! Thanks all,

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Old 02-27-2003, 05:25 PM
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The Fel Pro 1094 gasket has a compressed thickness of .015". This gasket also has a smaller bore than a lot of gaskets (4.100") for slightly more compression.
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Old 02-27-2003, 05:40 PM
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Yes there are thin gaskets that are about .020 thick stamped steel from Felpro part# HS7733SH2 for the set.
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Old 02-27-2003, 06:39 PM
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You are using domed pistons? Where is the quench area? What compression are you targeting? You need to hit a quench of .045 or less.
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Old 02-28-2003, 03:10 AM
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The quench area is on the intake manifold side of the piston and I'm looking for 11.5 to 12:1.

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Old 02-28-2003, 10:38 AM
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Honestly, I cannot speak with authority on this, you need to do some research but here is what I suspect. First, you know you won't be able to run pump gas with a motor with that much compression. Second, the quench is meant to induce a swirl effect in the pocket that will not support detonation. It is easy to do with a flat or D cup piston, but I don't know about a domed piston. Most of these were used in conjuction with leaded gas back in the 60's. Maybe the dome creates this effect, but I am not sure. You need to get the quench down below .045 however. I did zero deck my block and used a .025 gasket. It works very well for me.
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Old 03-01-2003, 04:39 PM
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I agree with F-1Rodder on the type of pistons to use, if you want that high of compression I recommend aluminum heads. I'm running 11.5:1 with flat tops without any problem.
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Old 03-02-2003, 09:03 AM
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I'd love to throw $1000 at a set of heads but it's just not going to happen. I'm using a set a fully ported 492's that I snagged for $200. They fit into my budget and will have to do. Thanks for the help guys, I'm going to go with the .015 Fel-Pro's as my machine shop seconds the recommendation providing I don't run nitrous. They say the thin gaskets tend to go away between the cylinders with high cylinder pressures (just thought I'd pass that along).

The Vandal
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