How much should the intake be milled?
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Joined: Jul 2005
Posts: 473
From: Munfordville, KY
How much should the intake be milled?
Anyone know on average how much the intake will have to be milled to seal up with a zero decked block and heads that have been milled a few times? I just want to get in the right ballpark before I get the heads on the new shortblock. Thanks
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Joined: Oct 2002
Posts: 2,168
From: AACO, MD
Re: How much should the intake be milled?
http://web.camaross.com/forums/showt...ht=mill+intake
Originally Posted by PoorMan
Hey
This is some info I got out of HPBooks "How to rebuild small block chevy Lt1/lt-4 engines"
Anything more than 0.020 and milling the intake will be needed. Corrective cuts on both the (intake to head) mating surface and the (intake to block surface). It says you can take from the intake or the block, doesn't matter. Her are the formulas.
Combustion deck removal amount x 1.2 = material to remove from the intake port.
Combustion deck removal amount x 1.7 = material to remove from the intake manifold rails, front and rear.
So for .036 total cut. 0.04 off the intake port sides and 0.06 off the front on rear intake rails and you should be good. I would have all the cuts done on the intake and not on the block and heads.
Jeff D.
This is some info I got out of HPBooks "How to rebuild small block chevy Lt1/lt-4 engines"
Anything more than 0.020 and milling the intake will be needed. Corrective cuts on both the (intake to head) mating surface and the (intake to block surface). It says you can take from the intake or the block, doesn't matter. Her are the formulas.
Combustion deck removal amount x 1.2 = material to remove from the intake port.
Combustion deck removal amount x 1.7 = material to remove from the intake manifold rails, front and rear.
So for .036 total cut. 0.04 off the intake port sides and 0.06 off the front on rear intake rails and you should be good. I would have all the cuts done on the intake and not on the block and heads.
Jeff D.
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