Re: gen 2 hemi head cutting ?
[Re: domingo]
#1431086
05/06/13 11:31 AM
05/06/13 11:31 AM
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Joined: Jan 2003
Posts: 75,092
A Banana Republic near you.
JohnRR
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Quote:
Id measure the diameter of you combustion chamber and do the math as if it was the thickness of a gasket....should get you pretty close. better to shave a bit less than a bit too much....cc them again and see if you have to shave em any more than that.
This is moparts , surely I can get someone else to do that and tell me the answer? 
But good point on the head gasket thickness .
I looked in my 2002 vintage MP catolog and it says they are supposed to be 170cc just like original castings ... NOT ...
Why does this not surprise me.
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Re: gen 2 hemi head cutting ?
[Re: JohnRR]
#1431087
05/06/13 11:37 AM
05/06/13 11:37 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Id measure the diameter of you combustion chamber and do the math as if it was the thickness of a gasket....should get you pretty close. better to shave a bit less than a bit too much....cc them again and see if you have to shave em any more than that.
This is moparts , surely I can get someone else to do that and tell me the answer?
But good point on the head gasket thickness .
I looked in my 2002 vintage MP catolog and it says they are supposed to be 170cc just like original castings ... NOT ...
Why does this not surprise me.
Myself I would pour in your amount of liquid to see
where thats at... then measure what you need to cut
(of course this is with the head level)... no guessing
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Re: gen 2 hemi head cutting ?
[Re: JohnRR]
#1431088
05/06/13 11:41 AM
05/06/13 11:41 AM
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Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo
EL Master
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EL Master
Joined: Jan 2003
Posts: 9,670
Lima, Peru
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Quote:
Quote:
Id measure the diameter of you combustion chamber and do the math as if it was the thickness of a gasket....should get you pretty close. better to shave a bit less than a bit too much....cc them again and see if you have to shave em any more than that.
This is moparts , surely I can get someone else to do that and tell me the answer?
But good point on the head gasket thickness .
I looked in my 2002 vintage MP catolog and it says they are supposed to be 170cc just like original castings ... NOT ...
Why does this not surprise me.
the newer castings are 172 to 173 ccs new
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Re: gen 2 hemi head cutting ?
[Re: domingo]
#1431091
05/06/13 12:33 PM
05/06/13 12:33 PM
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Joined: Jan 2003
Posts: 75,092
A Banana Republic near you.
JohnRR
OP
I Win
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OP
I Win
Joined: Jan 2003
Posts: 75,092
A Banana Republic near you.
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Quote:
Quote:
Quote:
Id measure the diameter of you combustion chamber and do the math as if it was the thickness of a gasket....should get you pretty close. better to shave a bit less than a bit too much....cc them again and see if you have to shave em any more than that.
This is moparts , surely I can get someone else to do that and tell me the answer?
But good point on the head gasket thickness .
I looked in my 2002 vintage MP catolog and it says they are supposed to be 170cc just like original castings ... NOT ...
Why does this not surprise me.
the newer castings are 172 to 173 ccs new
Yes I found that out at 2am this morning
I'm trying to decide how much money to spend. I would like to bump the compression on the hemi to 10.5 , but I don't really have $2500 kicking around to do it via the stroker route ... As it is it's going to be 1500 to buy new semi custom pistons , bore and rebalance 
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Re: gen 2 hemi head cutting ?
[Re: dogdays]
#1431093
05/06/13 11:03 PM
05/06/13 11:03 PM
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Joined: Jan 2003
Posts: 75,092
A Banana Republic near you.
JohnRR
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Quote:
You are looking for 5cc, that'll be about 0.020".
I just did the math on a 4.25" bore, 5cc is 0.0215".
This is not exact but it'll get you closer.....
R.
Thanks , I really wish I could cut the head that much , as it is the edge of the intake valve is close to the OD of the chamber ... which is close to 4.320 ...
The fix is a semi custom piston with a 92cc dome ... or the 4.375 stroke crank I put my name on ... 
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Re: gen 2 hemi head cutting ?
[Re: JohnRR]
#1431094
05/06/13 11:06 PM
05/06/13 11:06 PM
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Joined: Jan 2012
Posts: 2,678
Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,678
Stuttgart, Arkansas
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The Mopar Hemi engine manual says remove .0041" for each cc. For each .010 removed cut .0085" off the intake face and .0116" from the front and rear rails of the block.
2011 Drag Pak Challenger
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Re: gen 2 hemi head cutting ?
[Re: rickseeman]
#1431095
05/06/13 11:29 PM
05/06/13 11:29 PM
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Joined: Jan 2003
Posts: 75,092
A Banana Republic near you.
JohnRR
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OP
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Joined: Jan 2003
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Quote:
The Mopar Hemi engine manual says remove .0041" for each cc. For each .010 removed cut .0085" off the intake face and .0116" from the front and rear rails of the block.
Thanks Rick . I have that engine book buried somewhere around here ... 
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Re: gen 2 hemi head cutting ?
[Re: JohnRR]
#1431096
05/07/13 04:55 AM
05/07/13 04:55 AM
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Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo
EL Master
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EL Master
Joined: Jan 2003
Posts: 9,670
Lima, Peru
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Quote:
Quote:
You are looking for 5cc, that'll be about 0.020".
I just did the math on a 4.25" bore, 5cc is 0.0215".
This is not exact but it'll get you closer.....
R.
Thanks , I really wish I could cut the head that much , as it is the edge of the intake valve is close to the OD of the chamber ... which is close to 4.320 ...
The fix is a semi custom piston with a 92cc dome ... or the 4.375 stroke crank I put my name on ...
Yes the intake valves are veryclose to the edge of the chamber, but you can still mill them. Take your intake valve out and see where the valve seats. All you need is that the valve is still sitting. The edge of the valves will protrude a bit past the flat surface of the head after you shave them.
Still I would advice to get a stroker crank or custom pistons to get you where you want compression wise....why shave the heads when its not needed? HEMI heads are expensive.
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