Intake won't bolt up after milling heads.. - Chevelle Tech
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post #1 of 26 (permalink) Old Feb 18th, 06, 6:24 PM Thread Starter
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Intake won't bolt up after milling heads..

I'm in the process of assembling my circle track engine. I had the heads flat milled .035 and the block decked to 9.010. Additionally I am using a .015 gasket trying to get my compression as close to 10.0 as I can.
I was about to bolt on the intake (cast iron qjet) and the bolt holes will not line up. I'm assuming was brought about due to the machine work. They are tight to the inside of the holes. I'm using the standard blue felpro intake gaskets. What are my options. Can I slot the holes? Thanks for any help as this is alittle out of my experience range. Please help as I'm now at a standstill.
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post #2 of 26 (permalink) Old Feb 18th, 06, 6:42 PM
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Re: Intake won't bolt up after milling heads..

Slotting the holes may be a quickie fix but I would have the machinist mill the intake to fit. Sounds like too much was taken off or measurments stacked up.

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post #3 of 26 (permalink) Old Feb 18th, 06, 6:52 PM
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Re: Intake won't bolt up after milling heads..

Went thru that last year on my 502 and had to take a dremel (if I spelled it correct) and make the bolt holes larger.I had to do a little at a time and then recheck it.If it's anything like mine was you'll notice it will need more on the bottom side of the holes.It takes a little time and work.I did mine on a angle taking more off the bottom side.

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post #4 of 26 (permalink) Old Feb 18th, 06, 7:02 PM
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Re: Intake won't bolt up after milling heads..

If it's a single plane intake, look down through the plenum to the ports where the head mates. You'll likely see the intake sitting way too high and need to mill the sides to get the ports in alignment.
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post #5 of 26 (permalink) Old Feb 18th, 06, 7:26 PM Thread Starter
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Re: Intake won't bolt up after milling heads..

Driver
yup it's the bottom of the holes to the inside..

10secbu
Its a gm dual plane so I can't see the ports but I suspect your right about the alignment


I guess I'll call the machinst and see what he thinks..Don't know why he didn't
say anything about it while I had the intake at the shop for cleaning.

Thanks guys...
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post #6 of 26 (permalink) Old Feb 18th, 06, 8:50 PM
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Re: Intake won't bolt up after milling heads..

Almost forgot,I also had trouble getting it to seal.Had it off and on three times before I got it to seal.

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post #7 of 26 (permalink) Old Feb 18th, 06, 9:01 PM
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Re: Intake won't bolt up after milling heads..

Do your track rules specify a stock intake [unmilled] ? I've seen one track use a stock manifold to see if the bolt holes line up.

Jeff
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post #8 of 26 (permalink) Old Feb 18th, 06, 10:01 PM
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Question Re: Intake won't bolt up after milling heads..

I guess I don't understand this at all b/c a flat-top pistoned old L-48 motor , (295 and 300hp), will be 10 to 1 with stock double-hump heads so why did you go through all this??

pdq67..

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post #9 of 26 (permalink) Old Feb 18th, 06, 11:05 PM Thread Starter
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Re: Intake won't bolt up after milling heads..

Quote:
Originally Posted by pdq67
I guess I don't understand this at all b/c a flat-top pistoned old L-48 motor , (295 and 300hp), will be 10 to 1 with stock double-hump heads so why did you go through all this??

pdq67..

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post #10 of 26 (permalink) Old Feb 18th, 06, 11:27 PM
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Re: Intake won't bolt up after milling heads..

Quote:
Originally Posted by Importtech
Gotta run 76CC head castings!
Quote:
Originally Posted by Importtech
I'm in the process of assembling my circle track engine. I had the heads flat milled .035 and the block decked to 9.010. Additionally I am using a .015 gasket trying to get my compression as close to 10.0 as I can.
I was about to bolt on the intake (cast iron qjet) and the bolt holes will not line up. I'm assuming was brought about due to the machine work. They are tight to the inside of the holes. I'm using the standard blue felpro intake gaskets. What are my options. Can I slot the holes? Thanks for any help as this is alittle out of my experience range. Please help as I'm now at a standstill.
=
Best scenario is to take .050 off the intake side of the heads.
This is the amount you removed from both pieces
This should put you back to "normal"
Any time you have the heads milled this much you should also have the intake side cut by 1.2 & the bottom of the intake or the top of the block by 1.7 according to theory on a small block.
I have used 1 to 1 for years with no issue.
The next best is to cut the intake but I don't like to do this as you are now married to this intake/head combo but if the heads are on then,,,,

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post #11 of 26 (permalink) Old Feb 18th, 06, 11:43 PM Thread Starter
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Re: Intake won't bolt up after milling heads..

Thanks for the input Mike. Yes the heads are on and valves are set. I'm not worried about cutting the intake as I can't see ever using it for any other purpose. I didn't really think about all the consequences of cutting the heads and block like changing pushrod lenght,intake fit etc or I might just changed the pistons and been done with it. Just trying to get an edge
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post #12 of 26 (permalink) Old Feb 19th, 06, 11:09 AM
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Re: Intake won't bolt up after milling heads..

http://home.isoa.net/~mharrisj/mill.html
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post #13 of 26 (permalink) Old Feb 19th, 06, 9:42 PM
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Re: Intake won't bolt up after milling heads..

Last year I milled my dart heads .040, plus used a 1094 shim gasket. I had to hog out the manifold bolt holes to get it together. It sealed just fine. It's apart again, making it a 383 this year. The gaskets look great, it was sealing, and any mismatch does not seem to be enough to be a problem.
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post #14 of 26 (permalink) Old Feb 19th, 06, 10:29 PM
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Re: Intake won't bolt up after milling heads..

Quote:
Originally Posted by JimM
Last year I milled my dart heads .040, plus used a 1094 shim gasket. I had to hog out the manifold bolt holes to get it together. It sealed just fine. It's apart again, making it a 383 this year. The gaskets look great, it was sealing, and any mismatch does not seem to be enough to be a problem.
=
Hi Jim,

What the hell kind of machine shops are you guys using that don't know how to correct the intake face of a set of heads??

If the bolt holes don't line up neither do the ports.
If the ports don't line up you are probably leaving power on the table,

You go out, spend the money for decent heads & then kill part of the flow by half as$ing the intake installation ???

Why not have your heads corrected while they are off?

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post #15 of 26 (permalink) Old Feb 19th, 06, 10:59 PM
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Re: Intake won't bolt up after milling heads..

NO heads should be milled without also milling the intake face to correct the angles. I've yet to figure out the logic of milling intakes. There's nothing wrong with intake..it's the heads that are out of whack.

There are "machinists" and then there are "hackers" and "whitlers"!!

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