how much can be taken off before i have to consider machining the intake as well.......

im at .017(est around .010 first time,.007 second time) removed now... machine shop says no worry until about .022...

thanks in advance....

i am wondering about alignment issues in regards to intake to head bolts....

 

I have milled as much as .030 with no problems. Anything over that and I would definitely mill the intake as well though.

 

thanks alot...so i should be in good shape..

 

Is there a formula to use if my heads were milled more than that? I'm not sure how much my heads were milled down since I didn't put the long block together. I know if I set the intake on the bolt holes are slightly off.

Thanks,

Jody J.

 

with gasket i presume....a competent machine shop should be able to take care of that for you....

dont know about a formula though.......not so much a formula as just plain geometry and mathematics...

 

With a 10 degree manifold to deck surface angle (like a small block Chevy) the amount you need to mill off of the manifold mating surface (on either the head or intake itself) is 1.2 times the amount you milled off the head. So if you milled the heads .030 then you would mill the manifold surface of the head .036.

Don't worry though. Think about this, most blocks are set up at 9.025 deck height and an un-milled head. I regularly mill the blocks down .020 and the head .010 and don't have any problems getting the manifold on.

 

which portion of the intake needs to be milled?...

 

The side facing the head.

Usually I try to avoid milling the intake though because then it is only set for THAT head. I prefer to mill the intake side ot the cylinder head itself so you can use it with any stock type intake.