Howdy folks, I would like to get some input from all of you.
I just picked up a set of 440source stealth heads for my 440, that will be replacing a set of 516. What I would like to know is- How much should I have milled off to have my compression ratio at around 10.5 to 1 and not need to mill the intake ?

Here's a little bit of info on what I will be working with.
440 bored .60 over
Stealth Heads at 84cc
2355 pistons at .009 down in the hole
Head gaskets from 440source .44 compressed. I was going to use the felpro 1009, but there will be a little bit of over hang on the ring in a couple spots.

I could sure use some advise on this. Let me know if I need to provide more info.

Thanks in advance.

I would worry more about getting the quench right, then the milling(that's just me)

.009 in the hole, and .044 is .053.

If you use a .030" cometic head gasket, then you'll have .039" pretty good.

Right there your up to about 10.1:1

If you go crazy with head milling you also get issues with pushrods etc. Maybe cut .015 off and stick with that

The cometics cost a little bit more, but are reusable, so if you have the heads off once, you got your money back.

Thanks dave571. .015 is what a good friend had told me also but I wanted to get some more input on the subject. Thanks again for the reply.

Quote:

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I would worry more about getting the quench right, then the milling(that's just me)

.009 in the hole, and .044 is .053.

If you use a .030" cometic head gasket, then you'll have .039" pretty good.

Right there your up to about 10.1:1

If you go crazy with head milling you also get issues with pushrods etc. Maybe cut .015 off and stick with that

The cometics cost a little bit more, but are reusable, so if you have the heads off once, you got your money back.

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I took .060" off of mine to yield 75CC chambers which gave me 10.5:1 with a Cometic .027" thick MLS gasket and the same 2355 TRW flattop slugs that were .021" down in a stock deck ht., .030"-over, 440. I was trying to keep my quench as close as I could without decking and running stock "Sixpack" forgings.
I DID have to take .075" off of the intake faces. It cut a bit into the valve cover rail but not too bad. As was also brought up about the pushrod clearance, I had to hog a bit out to get my 3/8" rods to work with my 1.6 rockers but if you are stock sized with the stock stuff or even 1.5's you will probably be ok but dubble check it to be sure.
Good luck!

Bud

I took .050" off of my 452's, now 74 cc's and I run stock pushrods with a hyd cam. It may not be ideal but seems to work fine.

Just bought a set of Edelbrock RPM performers with stage three porting from Hughes (will flow about 325 cfm). Was running ported 915s flowing at 281 cfm that had milled down through the years without compensating on the intake side of the head. Always had intake manifold fitting issues and did not want to cut mill my intake down.
I estimate by the cylinder pressure I was about 11.5 -1 on the 915s.
Dave at Hughes told me I would have to go about 13-1 with the aluminum to really see the benifit of the increased cfms. We ended up milling down the heads and the intake side of the head for proper fit of the intake, am also going with 0 deck on the Ross flat tops. All this is going into the new World/ MP performance block. Am really excited to get this together and see how she flys.