L92 Combustion Chamber

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Sep 27, 2006 | 01:21 PM

garrettpen

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L92 Combustion Chamber

What size combustion chamber do theese heads have stock?

Sep 27, 2006 | 01:37 PM

WKMCD

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Richard at WCCH measured it at 69.8cc.

Sep 27, 2006 | 01:42 PM

garrettpen

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Thanks.

Sep 27, 2006 | 04:46 PM

WKMCD

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I think when I worked the numbers for my motor, I came up with 11.17:1 compression on the 402 with 2cc pistons and .050 gaskets.

Sep 27, 2006 | 10:38 PM

SStrokerAce

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which for you means you gotta mill them puppies!

Sep 28, 2006 | 07:03 AM

WKMCD

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Quote:

Originally Posted by SStrokerAce

which for you means you gotta mill them puppies!

It's your cam we're going to run...

How much to mill? PM me if you want.

Sep 28, 2006 | 01:47 PM

garrettpen

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what would the cc size go down to if say you milled .030?

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Sep 28, 2006 | 10:03 PM

JZ'sTA

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From: Ft. Myers Fl

yep figure around 6-7 thous for every 1cc.
so 69.8 cc's minus 30 thousands should be close to 65-66.

Sep 28, 2006 | 10:18 PM

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airflowdevelop

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there's plenty of flange on these heads....cut the pigs!!!

As measures with DcI seats (69.6cc) stock.

Oct 2, 2006 | 01:14 PM

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garrettpen

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Thats a good rough formula to know, And milling that off you would still have enough clearance between the valve and the cylinder wall?

Oct 2, 2006 | 01:52 PM

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See5

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In talking to some very knowlegeable guys who do work on these heads and manifolds for GM, it not clear yet that these heads are a slam dunk due to port size issues. They flow like crazy but they are truck heads. Not only that, if you start seriously milling the heads you can expect geometry, port match and manifold fit issues. Not to say they don't have big potential but-

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L92 Combustion Chamber

L92 Combustion Chamber

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