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243 heads on lm7

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Old Mar 11, 2018 | 06:49 AM
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Default 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?
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Old Mar 11, 2018 | 07:02 AM
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Milling the heads .030" will put you around 10 : 1 cr.

What you using the motor for?
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Old Mar 11, 2018 | 07:05 AM
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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
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Old Mar 12, 2018 | 10:56 PM
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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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