243 heads on lm7

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Mar 11, 2018 | 06:49 AM

Auzzybear

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243 heads on lm7

I’m putting 243 heads on a 5.3 lm7 I’ve read that they should be decked .030 is this to much?

Mar 11, 2018 | 07:02 AM

98CayenneT/A

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From: White Bear, Mn

Milling the heads .030" will put you around 10 : 1 cr.

What you using the motor for?

Mar 11, 2018 | 07:05 AM

Auzzybear

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Quote:

Originally Posted by 98CayenneT/A

Milling the heads .030" will put you around 10 : 1 cr.

What you using the motor for?

its going in a 94 Sierra daily driver/pick on imports

Mar 12, 2018 | 10:56 PM

jetech

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From: Dade City, Fl.

I'm not sure but I think you would have to use a 0.040 head gasket to achieve a 10.0:1 cr using 243 heads milled close to .030". Aftermarket cam? Measure ptv clearance , quench and pushrod length

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