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Re: Milling cylinder heads?? [Re: psycho_440] #243588
03/08/09 11:55 AM 03/08/09 11:55 AM
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i had a set of 452's milled i think .080 a few years ago and had the intake side milled...everything fit just fine.
Re: Milling cylinder heads?? [Re: psycho_440] #243589
03/08/09 12:23 PM 03/08/09 12:23 PM
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Psycho,

What pary of MO are you from? Im in KC. Is there a shop you recommend?
Re: Milling cylinder heads?? [Re: cdp] #243590
03/08/09 12:57 PM 03/08/09 12:57 PM
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i live just about 2 hrs NE of you. in chillicothe right off of hwy 36. i took my heads to cameron engines in cameron, i have to give him the numbers but he's the closest shop i found that will do it. i think he charged $100 for the last set. pretty good ol' boy. K and M in kc is supposed to be a good shop. also yancys and maybe mann speed??
Re: Milling cylinder heads?? [Re: psycho_440] #243591
03/08/09 01:01 PM 03/08/09 01:01 PM
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I'm familiar with K&M and Mann. Have used neither as I've never had much work done before. Never heard of Yancy.

I've heard different stories on different ones. You know how it is, you only hear the bad.
Re: Milling cylinder heads?? [Re: psycho_440] #243592
03/08/09 01:12 PM 03/08/09 01:12 PM
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Quote:

mill the intake side of the head not the intake. then you dont have an intake that only works on one set of heads or vice versa.



thats nice and works for light milling jobs, but I think there is not enough material on intake side of heads when we talk about a heavy mill job( 050 or so ), will get weak side walls on heads, don't you think ?

With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: Milling cylinder heads?? [Re: NachoRT74] #243593
03/08/09 01:22 PM 03/08/09 01:22 PM
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To get to the 70-72 cc's that I want, I'd have to take off about .060 on the chamber side and about .030 on the intake side. What will happen is the rough cast surface will be machined off on the intake side. I don't know how much material is on there, but .030 is alot to take off and will take some out the valve cover gasket surface on the intake side I think.
Re: Milling cylinder heads?? [Re: cdp] #243594
03/08/09 01:32 PM 03/08/09 01:32 PM
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all that i can tell you is i have gone .080 before with the intake side also corrected and had no problem. really even .030 is very small amount of material removed.just kinda "flattened out the raiesed spots on the intake side of the ones i had done .080...you know how its kinda raised where the gasket sits.
Re: Milling cylinder heads?? [Re: cdp] #243595
03/08/09 01:50 PM 03/08/09 01:50 PM
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Quote:

I'm familiar with K&M and Mann. Have used neither as I've never had much work done before. Never heard of Yancy.

I've heard different stories on different ones. You know how it is, you only hear the bad.

only motors i know of built at k&m were 800-1000 hp chevys. the local car quest machine shop does all my standard procedure stuff, and hughes has done all my head work cam etc. local place says they cant mill the intake side of the head (or the intake for that matter). and any of the local "performance shops" dont seem to want to mess with just a head mill on some dang dodge motor. so i take my stuff to cameron. kinda nervouse bout taking my $1200 heads to anybody but hughes but it would have taken prob $200 just to ship them there and back. cameron has always done me good. he even miled a smallblock intake for me years ago.
Re: Milling cylinder heads?? [Re: psycho_440] #243596
03/08/09 01:51 PM 03/08/09 01:51 PM
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I don't think it will "weaken" the head any. And .030 is relatively small I think. When I talk to the machine shop, i'll find out. I'd prefer not to cut the intake.
Re: Milling cylinder heads?? [Re: psycho_440] #243597
03/08/09 01:56 PM 03/08/09 01:56 PM
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ok here is some confusing info ( I think, unles I'm reading wrong )

I have in my archives that for every 0.010 of head need to mill 0.0123 of intake side... actually could it be done on intake or intake side of head, thats on each one, but still wondering if there is enough material to make a heavy mill down job on intake side of the head without get weak ( maybe it could be shared between head and intake )


that would mean for 0.060 mill down head surface will need 0.0738 on intake side... 0.030 would it be 0.0369 on intake side


but here has been told:

Quote:

and .0063 to the intake for every .010 you mill from the head. so .030 off the heads would get you about 5cc and require a .0189 intake cut







Then ARE WE ALL AGREE about needs to mill 0.0062 for each CC ?

ALSO confirming conversion info... one milimeter would it be about 0.052 ? or less ?

5078684-Head.jpg (46 downloads)
Last edited by NachoRT74; 03/08/09 02:10 PM.
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Re: Milling cylinder heads?? [Re: NachoRT74] #243598
03/08/09 02:09 PM 03/08/09 02:09 PM
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yes my big mopar book says to mil .0123 on the intake for every .010 but... a friend of mine used those mopar performance figures on a small block and we had to stack intake gaskets for the intake to fit...it wasnt even close. the specs i gave are from hughes engines and have worked perfect for me in the past. so i dunno??? .0123 seems alot if you are only milling .010 on the head.
Re: Milling cylinder heads?? [Re: psycho_440] #243599
03/08/09 02:11 PM 03/08/09 02:11 PM
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well those numbers are stated on the archive to B and RB blocks. not SB, so that it could be the reason

With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: Milling cylinder heads?? [Re: NachoRT74] #243600
03/08/09 02:20 PM 03/08/09 02:20 PM
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Quote:




Then ARE WE ALL AGREE about needs to mill 0.0062 for each CC ?

ALSO confirming conversion info... one milimeter would it be about 0.052 ? or less ?



quoting myself...

somebody told me the conversion for 1 mm was 0.052, and I got on my calculator IT IS REALLY 0.03937... what a difference!!!

that would mean for around one milimeter milling job I would get around 6.5 cc less

With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: Milling cylinder heads?? [Re: NachoRT74] #243601
03/08/09 02:29 PM 03/08/09 02:29 PM
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Quote:

well those numbers are stated on the archive to B and RB blocks. not SB, so that it could be the reason

nah...we used the small block specs... trying to find them...cant find them in my mopar book right now. hughes says the same for small block (.0063 for every .010) his machine shop also might have donked them up????
Re: Milling cylinder heads?? [Re: NachoRT74] #243602
03/08/09 02:34 PM 03/08/09 02:34 PM
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Quote:



Then ARE WE ALL AGREE about needs to mill 0.0062 for each CC ?




quoting myself again... I had doubts about this info. I made these same questions long time ago at DC.com board and got this answer:

With the open chamber heads on big block mopars you figure you need to mill about .004" per cc and since you need to reduce it by 12 cc's your looking at about .048" to mill off of the heads and around .060 off of the intake side of the heads, also pay close attention to your pushrod length and lifter preload especially if you don't have an adjustable valvetrain.

so... .0062 or .0040 for each CC ?

WHY I'm constantly asking ? because I don't have funds to mill down again if I get short, or make another head job If I pass the wished numbers!!! so I need to make the job JUST ONCE AND GET IT RIGHT!!!!

With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: Milling cylinder heads?? [Re: NachoRT74] #243603
03/08/09 02:38 PM 03/08/09 02:38 PM
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What head are you milling? Open Chamber vs Closed Chamber makes a difference...

http://www.mopar1.us/mill.html
Re: Milling cylinder heads?? [Re: 1_WILD_RT] #243604
03/08/09 02:44 PM 03/08/09 02:44 PM
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I have 452s to make the job.

BTW sorry the highjack cdp, but maybe my questions it could be very usefull on this thread

GREAT LINK!!!!...

BTW, I think we all were talking about open heads ( however, 452s are on 90 CC numbers, mine got 92 CC, LOT MORE than the link states, but I think works the same on reducing CC job, since we talk on these about a cilindrical geometry on open heads not the wedged chamber area. )

Last edited by NachoRT74; 03/08/09 02:50 PM.
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Re: Milling cylinder heads?? [Re: NachoRT74] #243605
03/08/09 02:52 PM 03/08/09 02:52 PM
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no problem. You have valid questions. I have a set of 906's and was curious to how much was needed just to get 1cc. I need to get them down some too.

Thanks to everyone here, I think I got my answers to some degree.

I've heard that some info in the BB MP Book is not correcet. The milling could be one of those things. I have the book too.

The heads I have are 516's (closed chamber), so it will take more to gain 1cc as compared to an open head.

So the .0062 would be for closed, and .004 for open?

Last edited by cdp; 03/08/09 02:56 PM.
Re: Milling cylinder heads?? [Re: NachoRT74] #243606
03/08/09 02:53 PM 03/08/09 02:53 PM
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well i am thouroghly confused now. i will go with the hughes engines numbers...they worked for my in the past. plus you could have use the lesser of the two figures and if it was wrong you could have more milled. hard to weld those shavings back on

Re: Milling cylinder heads?? [Re: psycho_440] #243607
03/08/09 03:18 PM 03/08/09 03:18 PM
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I still haven't done anything yet in all this 6 months since I got all the parts to my performance upgrade ( I have been some lazy to began the porting job LOL ), but I also wanted to be sure about the numbers needed.

Quote:

plus you could have use the lesser of the two figures and if it was wrong you could have more milled.



yes definitelly you are right, but as stated I don't want to make the job twice ( funds reasons mainly )

Last edited by NachoRT74; 03/08/09 03:43 PM.
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