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Re: a milled Cylinder head question
[Re: motomatt383]
#1357335
12/22/12 09:53 PM
12/22/12 09:53 PM
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Anonymous
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Anonymous
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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.
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Re: a milled Cylinder head question
[Re: ]
#1357336
12/22/12 11:10 PM
12/22/12 11:10 PM
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Joined: Aug 2005
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MLR426
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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
Last edited by MLR426; 12/22/12 11:14 PM.
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Re: a milled Cylinder head question
[Re: motomatt383]
#1357338
12/23/12 11:23 AM
12/23/12 11:23 AM
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Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
roadhazard
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Akron, Ohio U.S.A.
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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
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Re: a milled Cylinder head question
[Re: MLR426]
#1357340
12/23/12 09:42 PM
12/23/12 09:42 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
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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.
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Re: a milled Cylinder head question
[Re: 360view]
#1357342
12/28/12 03:09 PM
12/28/12 03:09 PM
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Joined: Aug 2005
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MLR426
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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
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Re: a milled Cylinder head question
[Re: roadhazard]
#1357343
12/28/12 03:15 PM
12/28/12 03:15 PM
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Joined: Aug 2005
Posts: 4,799
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MLR426
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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
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Re: a milled Cylinder head question
[Re: motomatt383]
#1357344
12/28/12 03:20 PM
12/28/12 03:20 PM
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Joined: Aug 2005
Posts: 4,799
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MLR426
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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
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Re: a milled Cylinder head question
[Re: MLR426]
#1357345
12/28/12 11:04 PM
12/28/12 11:04 PM
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Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
roadhazard
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master
Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
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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
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