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Old 01-17-2004, 12:11 AM   #1 (permalink)
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raising compression ratio

I want to up my compression ratio as much as possible without changing the pistons. 351W Windsor Sr. heads factory dished piston.

1) Can anyone recommend a reliable, but thinner than stock head gasket.

2) How much can you mill the heads before having to mill the intake to match?
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Old 01-17-2004, 10:04 AM   #2 (permalink)
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raising compression ratio

SCE has a pretty good selection of Ford thin copper gaskets.

http://www.scegaskets.com/catalog.html
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Old 01-17-2004, 09:27 PM   #3 (permalink)
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raising compression ratio

I think general rule of thumb is that once you get to .030 when milling heads you need to start milling the intake to match.
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Old 01-17-2004, 10:25 PM   #4 (permalink)
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raising compression ratio

Any good machinist, (automotive/whatever), will be able to quote you off the top of their head, EXACTLY how much has to come off intake, (bottom and sides), to make them fit after block/head alterations.
If they don't, I"d seriously look into finding another machinist.
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Old 01-18-2004, 08:16 AM   #5 (permalink)
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raising compression ratio

I would strongly recommend checking your current valve to piston clearances first. That will tell you how much you can safely move the heads closer to the pistons. Then you can determine head gaskets or head milling limitations.

It doesn't cost that much to have the intake angle milled to match how much you take off your heads. If you can go over .030 on the heads and still keep your valve clearance I say go for it.

Oh, definitely discuss this with your machine shop. At some point on head shaving you wind up having to angle mill them. If you eventually get close enough you will have to have your pistons fly cut and your motor rebalanced. That seems unlikely with dish pistons but its possible.




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[ This Message was edited by: Hottarod on 1/18/04 8:31pm ]
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Old 01-18-2004, 09:36 AM   #6 (permalink)
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raising compression ratio

A little FYI. YOu'd be shocked how much metal can come out /off of a piston, (i.e. fly cutting valve reliefs), before you have to rebalance. (been there, done that........lots).
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Old 01-18-2004, 11:49 AM   #7 (permalink)
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raising compression ratio

Thanks for the input, I measured piston to deck clearance today, its zero so thinner gaskets are out. looks like new pistons or smaller chamber heads.
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