Moparts

EDDY HEADS

Posted By: QWK_ENUF

EDDY HEADS - 04/16/11 05:11 PM

i have a set of eddy heads decked fro 88cc to 64cc.any one know how much to cut the intake. thanks

Posted By: BradH

Re: EDDY HEADS - 04/16/11 07:23 PM

How much was taken off to reduce the chamber volume by 24 cc? BTW, that sounds like a LOT of milling to me.

Posted By: Jeepmon

Re: EDDY HEADS - 04/16/11 07:47 PM

When I have my SB Eddy heads shaved, I wish I would have had someone mill the intake side as well.. Everytime I want to put a new intake on there.. I have to remember the cost to have it milled..

Posted By: 64Post

Re: EDDY HEADS - 04/16/11 08:24 PM

To my thinking you would need to know what the stock height outer bolt bosses on the Eddys are; they might be 1.00" like stock Mopar heads.

Then measure your heads to find what was cut, for example .090" and multiply by 1.23 X .090"=.1107". Or, another way 9 [.090 � .010] X .0123"=.1107" off the intake.

Posted By: CompWedgeEngines

Re: EDDY HEADS - 04/16/11 08:30 PM

Typically its about .005-.006 per cc.

I usually take a minimum of 1:1 of intake per deck milling, and I think 64 Post is correct at around .011/.012 is usually the real number off the intake.So .010 off the deck, .011-.012 off the intake. Thats a lot of cutting on those heads. How come?

Posted By: Dunnuck Racing

Re: EDDY HEADS - 04/17/11 12:36 AM

The 440 I have been testing with lately has Eddy's cut to 65cc's.Besides cutting the intake mounting flanges to get it lined up,I also had to make a cut off of it where the bottom of the flange meets the valley tray.Valley tray fitment is an issue as well,the heads dont butt up to the edge of the block like they should when the heads are cut this far.
I hope it goes better for you than it did for me,but it is what I had to work with on this build.
Keith

Posted By: formula S

Re: EDDY HEADS - 04/17/11 07:39 AM

For every .010 off of the deck surface you need to remove .0123 off of the intake surface, but before you go crazy on the head I would probably look at the intake, because if you start milling the intake surface of the head, you going to end up with a head with very little valve cover rail. click on the link for milling info http://www.mopar1.us/mill.html

Posted By: 64Post

Re: EDDY HEADS - 04/17/11 03:40 PM

Quote:

For every .010 off of the deck surface you need to remove .0123 off of the intake surface, but before you go crazy on the head I would probably look at the intake, because if you start milling the intake surface of the head, you going to end up with a head with very little valve cover rail. click on the link for milling info http://www.mopar1.us/mill.html

Yeah, I remember the .123?/.0123 number from memory. I was too lazy to look it up. Thanks for the clarification. The result is the same dimension.

I remember Jeff cutting my Eddys .030". I ended up cutting the intake manifold .040" but I also used .060" Ultra Seal gaskets without the pan.

Posted By: larry890

Re: EDDY HEADS - 04/18/11 04:28 AM

when I cut my eddies down to 75cc, i hade the intake milled and welded a aluminum plate to the bottom of the intake. The valley pan would not even come close to fitting.

Posted By: Sport440

Re: EDDY HEADS - 04/18/11 05:10 AM

Quote:

i have a set of eddy heads decked from 88cc to 64cc.any one know how much to cut the intake. thanks

The 88cc heads were the Open chambered heads. So you can mill less off the face per cc loss compared to the 84cc closed chamber head.

From my estimates your Eddy 88cc open chamber heads were cut to around a .100 mill.

The correct geometry math is .100 off the flat, .123 off the intake.

With a proper .123 off the intake face, the intake vallay pan rail will need a xx amount of mill too.

I have never followed or used the correct geometry math myself. Below .040 shaves,sometimes none of the above needs to be addressed.

My Question is, Did you cut these heads yourself this much or did you pick them up, on the cheap off of someone else who did.

Either/or, no one cuts the flats this much without taking something off the intake side. Most machinests will stamp the heads with said mill measurements.