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Milling 243 heads

Generation III Internal Engine 1997-2006 LS1 | LS6

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Milling 243 heads

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Old

Apr 13, 2016 | 10:57 AM

#1

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From: Clearwater, FL

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Milling 243 heads

I am just finishing up porting a set of 243 heads and I am wondering how much I should have them milled to bump the compression up with the 228/232 cam I currently have in the car. The previous owner that I got the heads from said the heads have already been to a machine shop so I am not sure how much if any has been milled already.

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Apr 13, 2016 | 11:29 AM

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Have the chambers been touched at all? If not, you can measure the cc on those and from there you can calculate how much was milled.

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Apr 13, 2016 | 11:50 AM

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Quote:

Originally Posted by redtan

Have the chambers been touched at all? If not, you can measure the cc on those and from there you can calculate how much was milled.

The only thing in the chamber I have touched is the rough edges where the spark plug comes in that's it.

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Apr 13, 2016 | 06:48 PM

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Then you should be pretty close to stock so CCing the chamber will tell you how much, if any, has been milled off the decks.

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Apr 13, 2016 | 07:09 PM

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Quote:

Originally Posted by redtan

Then you should be pretty close to stock so CCing the chamber will tell you how much, if any, has been milled off the decks.

Ya im going to mess around with that tonight. I want to to get it as close to 11:0 compression as possible and still have good ptv clearance.

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Apr 14, 2016 | 02:42 AM

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From: Bergen County, NJ

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You should consider the head gasket you plan to use and the desired quench area in determining how much you want mill. Mine wound up at 10.7.

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Apr 14, 2016 | 01:31 PM

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From: Little River SC

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there's a sticky up above that will help with numbers

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Old

Apr 14, 2016 | 02:12 PM

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Quote:

Originally Posted by farmington

there's a sticky up above that will help with numbers

Thank you I have read through it. Looks like they haven't had anything milled at all.

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