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Milling cylinder heads?? #243568
03/04/09 11:34 PM 03/04/09 11:34 PM
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I have a set of 516's that appear to be stock surface. How much would I need to mill to get 70-72 cc's?

Its going on a 383 with pistons in the hole of .095.

Wanting 9:1 or so.

Thanks
Re: Milling cylinder heads?? [Re: cdp] #243569
03/05/09 01:08 AM 03/05/09 01:08 AM
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.030" should do it. Don't forget the intake side...
Re: Milling cylinder heads?? [Re: cdp] #243570
03/05/09 01:52 AM 03/05/09 01:52 AM
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plug it all into here http://kb-silvolite.com/calc.php? so you'll know what you really have for CR.

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Re: Milling cylinder heads?? [Re: RapidRobert] #243571
03/05/09 01:04 PM 03/05/09 01:04 PM
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Have the shop cc a couple chambers and then tell you waht you need. They are always larger than the factory specs.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
Re: Milling cylinder heads?? [Re: moper] #243572
03/05/09 01:14 PM 03/05/09 01:14 PM
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Quote:

Have the shop cc a couple chambers and then tell you what you need. They are always larger than the factory specs.



you can't just ASSUME they are a certain cc
Re: Milling cylinder heads?? [Re: JohnRR] #243573
03/07/09 05:11 PM 03/07/09 05:11 PM
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Yes, measure first, but I bet they are stock around 84cc. You'll cut about 60 off to get to 73 cc, my WAG.
Remember to cut the intake port side of the head too.
R.
Re: Milling cylinder heads?? [Re: dogdays] #243574
03/07/09 06:45 PM 03/07/09 06:45 PM
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Just a rough measure and they were 75cc. I thought all of them were under 80 from the start?
Re: Milling cylinder heads?? [Re: cdp] #243575
03/07/09 06:49 PM 03/07/09 06:49 PM
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Quote:

Just a rough measure and they were 75cc. I thought all of them were under 80 from the start?



they must have been cut before ? how thick is the boss where the outer rom of headbolts are under the exh ? something better than a rough measure , don't use a tape measure

Re: Milling cylinder heads?? [Re: JohnRR] #243576
03/07/09 08:41 PM 03/07/09 08:41 PM
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I cc'd them a while ago, this time with a plexiglass plate and a syringe from the local animal supply. I get right at 78-80. The thickness is 1.000-1.010 (digital calipers).

My A12 906's are right at .995 thick. Kind of in the same situation on my A12 heads. I want to get them down to around 80cc. They have been cut already, but with my .030 stock pistons, its around 8.9:1.

There are no mopar specific machine shops locally and I can't exactly afford Modern Cylinder head right now.

The 516's were a pretty good deal to use on my 383. the are already ported and polished with oversized valves and good springs/retainers.
Re: Milling cylinder heads?? [Re: cdp] #243577
03/07/09 09:12 PM 03/07/09 09:12 PM
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if your already at 8.9:1, just run em. You will see no difference in 8.9:1 HP versus 9:1 HP
Re: Milling cylinder heads?? [Re: Baxter61] #243578
03/07/09 09:27 PM 03/07/09 09:27 PM
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You would think with those closed chambers you could go higher on the compression. (Depending on cam.)

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Re: Milling cylinder heads?? [Re: Rug_Trucker] #243579
03/07/09 10:08 PM 03/07/09 10:08 PM
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I shoudn't have mentioned the A12 906's. Thats a different subject.

I have a rebuilt shortblock 383 HP that I got in trade several years ago and am now finishing putting it back together. I turns out that the guy I got it from had low compression forged pistons installed and it comes out to about 7.8:1 with 906/346 (85-88) heads.

Since we are in a thrifty economy, I'm going to not restore my Bee and just put it together on the cheap. So I ran across a set of 516's and since I'm going to have them checked out, lapped, and milled, I figured I'd try and get the CR more in the 9:1 range. This is going to be a pretty low buck assembly.
Re: Milling cylinder heads?? [Re: cdp] #243580
03/08/09 02:10 AM 03/08/09 02:10 AM
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Quote:

I cc'd them a while ago, this time with a plexiglass plate and a syringe from the local animal supply. I get right at 78-80. The thickness is 1.000-1.010 (digital calipers).





You are still seeing a .010 difference , that 10 thou , thats alot with a digital caliper , but the heads haven't been planed , if much at all .
Re: Milling cylinder heads?? [Re: JohnRR] #243581
03/08/09 08:22 AM 03/08/09 08:22 AM
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factory miling marks on th head deck are straight wheras machine shop ones leave circular marks. this may help you determine if it is original/unmilled

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Re: Milling cylinder heads?? [Re: RapidRobert] #243582
03/08/09 09:45 AM 03/08/09 09:45 AM
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Someones used a scotchbrite on the gasket surfaces with a air tool or something. Makes it hard to tell.
Re: Milling cylinder heads?? [Re: RapidRobert] #243583
03/08/09 09:50 AM 03/08/09 09:50 AM
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Quote:

factory miling marks on th head deck are straight wheras machine shop ones leave circular marks.


Not nessessarly so. Depends on the machine shop.
Re: Milling cylinder heads?? [Re: cdp] #243584
03/08/09 10:11 AM 03/08/09 10:11 AM
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Quote:

Someones used a scotchbrite on the gasket surfaces with a air tool or something. Makes it hard to tell.



Those things can screw up the flatness of the surface real easy , the heads should be at a minimum SKIMMED to true the surface .
Re: Milling cylinder heads?? [Re: JohnRR] #243585
03/08/09 10:55 AM 03/08/09 10:55 AM
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I'm thinking of having about .030 taken off. I have an old DP4B that I can have milled also.

Heres a question: How does it affect the valley pan gasket when taking that much material off?
Re: Milling cylinder heads?? [Re: cdp] #243586
03/08/09 11:46 AM 03/08/09 11:46 AM
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Quote:


Heres a question: How does it affect the valley pan gasket when taking that much material off?




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Re: Milling cylinder heads?? [Re: cdp] #243587
03/08/09 11:53 AM 03/08/09 11:53 AM
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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. mill .0062 to reduce the chamber by one cc (on 915 and 516). 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. just dropped my 452's of yesterday to have them done.
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