Milled GT40 Heads???

[1989SCZ]

okay, im looking to buy a set of F3ZE GT40 Explorer Heads for $87 each. As well as a GT40 Explorer Intake (price unknown yet).

How much am I able to mill before piston to valve clearance becomes an issue with the following:

-Stock cam with possible 1.6 or 1.7rr?

-Aftermarket cam with .500 to .550 lift and possible 1.6 or 1.7rr?

Will milling .030 cause problems with lower manifold to head alignment?

It would be great for some help, i know there are forums on here similar to this, but the information is scattered and I've tried my best to search and get some ball park estimates.

I am mainly trying to get a list of possible issues and problems that could arise from this swap beforehand.

 

[Mr. Rustypwnz]

as long as you stay around .030 your intake will bolt up fine, and you should be able to squeeze around .530ish lift out before it gets close with those heads, I know i ran a .512 lift cam on ported and milled e7's with bigger gt40 valves and I had room to grow if needbe..

 

[maxine-70]

im running a TFS stage 1 (.499/.510) on my real gt40's milled .030. i reused the stock rockers and just put .030 shims under them. no issues at all