ede

i have a set of heads with a gas cut between 2 chambers about .040 deep. if i get the heads milled enought to clean this up will i have to get the intake side milled too to correct the angle the intake sets at? i'm pretty sure i know the answer, but i wanted someone else to say i have to do it before i do. and vader if you read this it isn't the 6 cylinder 350 it's a set of dart heads for a 355 in my sons car.

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RB83L69

Chances are you will have to, but it's not definite...

I'd have the heads milled straight, so the intake flange angle doesn't change. All that wil happen is the intake flange will descend in toward the block; if you mill both heads .040", the intake will be about .028" down.

On the other hand, if you use a slightly thicker head gasket (the FelPro 1044 comes to mind, about .015" thicker than the regular 1014) it might make up enough of the difference to where the intake bolts will be able to go in.

I would suggest bolting the heads up with the thicker gasket, just as they come back from the shop. Then test fit the intake with a thinner gasket like a 1204. If the bolts thread in, you don't have to do anything else. You might get lucky. If not, get the intake planed about .055" on each side and the bottom.

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"So many Mustangs, so little time..."

[This message has been edited by RB83L69 (edited December 01, 2000).]

Vader

Ed,

I'm with RB. Mill flat if you want only to mill the problem away. Or, weld up the tracks with nickel and mill flat at a depth closer to stock specs (a submerged arc would be a good idea since you pro'lly have the equipment to make it happen).

Milling 40-thou off the heads - yeah, you already know the answer. And depending on the castings and core shift, you might end up with only 0.150-0.180" of iron in some critical areas.

That's one of the really nice things about Poncho engines - mill whatever you want and bolt on the intake.


Oops! - I missed the part about Dart heads. A coolant tank, nearly-submerged casting, and a TIG and aluminum might be a better option than nickel (Doh!).
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Later,
Vader
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[This message has been edited by Vader (edited December 03, 2000).]

ede

vader they're iron heads, aluminum and i'd have them welded up by now. never welded iron heads before and am a little afraid of making a new crack or something. actually i'd have about .25 or more left after cutting .040 off. what i've been thinking was trying to find a pound spool of nickel wire and useing mig on it, lower heat from mig. after looking (and not doing the math) i'm afraid if we milled them we'd be running race gas all the time.

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