a milled Cylinder head question

Posted By: motomatt383

a milled Cylinder head question - 12/23/12 12:27 AM

I'm looking at a used set of 452 heads, lightly ported (gasket matched) nice valve springs retainers & all that stuff. my question is they have been surfaced, quite a bit it appears. 1 needs to be surfaced again. my concern is, is there a way to tell how much has been milled off them? I know small block Chevy heads have a target spot to measure off. do the Mopars have a spot like that?

Posted By: Anonymous

Re: a milled Cylinder head question - 12/23/12 01:53 AM

Yes
The distance from the deck to the "closed" or shallow part of the open chamber is almost always near .100 thou give or take--good yardstick if there ever was one.

Posted By: MLR426

Re: a milled Cylinder head question - 12/23/12 03:10 AM

Use a mic and measure the lower head bolt outside flange area at one of the corners. The range in stock thickness can be from .995 to as much as 1.015 for stock heads that haven't been milled.
Measure both heads and post the readings. You need to measure both heads and if one head does need milled mill the other so you have both heads the same thickness when done.

MLR426

Posted By: motomatt383

Re: a milled Cylinder head question - 12/23/12 04:52 AM

both heads measure at .995-,993 pretty evenly across them. how far can they be safely milled then?

Posted By: roadhazard

Re: a milled Cylinder head question - 12/23/12 03:23 PM

Quote:

both heads measure at .995-,993 pretty evenly across them. how far can they be safely milled then?

A whole lot more

My 915's have a .110" angle mill plus a .025" straight cut on them

I'd say there's about .100" material left between the spark plug threads and the deck

Been

it for years

Posted By: JohnRR

Re: a milled Cylinder head question - 12/24/12 01:10 AM

How much is the seller asking for the heads ?

Posted By: lewtot184

Re: a milled Cylinder head question - 12/24/12 01:42 AM

Quote:

Use a mic and measure the lower head bolt outside flange area at one of the corners. The range in stock thickness can be from .995 to as much as 1.015 for stock heads that haven't been milled.
Measure both heads and post the readings. You need to measure both heads and if one head does need milled mill the other so you have both heads the same thickness when done.

MLR426

this is correct. i've found the '906 heads to be 1.00 and the '452's maybe 1.1.

Posted By: 360view

Re: a milled Cylinder head question - 12/24/12 02:07 PM

Is there a similar measuring spot for small block cylinder heads?

Posted By: MLR426

Re: a milled Cylinder head question - 12/28/12 07:09 PM

Quote:

Is there a similar measuring spot for small block cylinder heads?

Use same spot, lower corner head bolt boss.
I don't recall right off what the norm is for stock cast iron head thickness ?

MLR426

Posted By: MLR426

Re: a milled Cylinder head question - 12/28/12 07:15 PM

Quote:

Quote:

both heads measure at .995-,993 pretty evenly across them. how far can they be safely milled then?

A whole lot more

My 915's have a .110" angle mill plus a .025" straight cut on them
I'd say there's about .100" material left between the spark plug threads and the deck
Been it for years

Now thats screwed up

How does the intake fit ?

MLR426

Posted By: MLR426

Re: a milled Cylinder head question - 12/28/12 07:20 PM

Quote:

both heads measure at .995-,993 pretty evenly across them. how far can they be safely milled then?

What are you trying to accomplish ? With what piston and what camshaft ? As John asked what is the price of the heads ? May be better options for you depending on price. They appear to be original thickness.

MLR426

Posted By: roadhazard

Re: a milled Cylinder head question - 12/29/12 03:04 AM

Quote:

Quote:

Quote:

both heads measure at .995-,993 pretty evenly across them. how far can they be safely milled then?

A whole lot more

My 915's have a .110" angle mill plus a .025" straight cut on them
I'd say there's about .100" material left between the spark plug threads and the deck
Been it for years

Now thats screwed up How does the intake fit ?

MLR426

It's been made to fit together

Only thing I worry about is performance. I make things work to get what I want if need be

Makes life interesting and I can't argue with the slips