[70lemansport]

N00b Question('s) here,

How much can a pair of heads be milled without intake fitment problems while at the same time raising the compression. The heads are 70' #11's off of the 400 with an 8.6cr. Its goin on a 70 350 with either an 068 or a comp xe256h,perfromer,(not sure which carb) 2400 stall and either 3.55's or 3.73's. its a 70 lemans conv. and its my first car iv'e ever owned so any other suggestions would be great. But, im sticking with these heads, i know i should get 17's but can't find them and these were already magnafluxed with new everything and best of all FREE*.

Thanks Ahead of time,
Pat

[WDCreech]

Have you cc'd the heads and do you know how much you want to go to? Rule of thumb, is .005" per cc. Figure out how much you need to mill, then mill both, the deck surface and the intake surface, the same. The intake will then fit perfectly.

[smagnotti]

You can mill about .030" to .040" off the deck without having to mill the intake face of the head, but at .040" you will not be able to use a thick intake gasket like a Mr Gasket type and you will need to trim off any valley pan gasket that may be sticking out past the cover.
At a mill of .030" you will knock 6 CCs out of your chamber volume.