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 Intake / Carb and Fuel Delivery Tech
 cutting intake ports on head
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beertracker
Cochise

350 Posts

Posted - 19 Aug 2014 :  11:35:54 AM  Show Profile  Reply with Quote
Wanted to get a few other opinions before spending. My machine shop told me it's not necessary to cut the intake ports if the heads are milled .040" the intake gasket will still seal. I realize the ports will be mis-matched. What do you think? Would you follow this advise?

I want a LS engine in my Pontiac

Edited by - beertracker on 19 Aug 2014 2:04:54 PM

cortcomp
Coyote

USA
5335 Posts

Posted - 19 Aug 2014 :  3:29:36 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
I would mill the intake side just so everything lines up better if you're gasket port matching. I mean, sure, for a stock rebuild you'd likely never know, but cheap to do now since the heads are off and at the shop already.
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Blued and Painted
Chief PONTIAC

USA
3406 Posts

Posted - 19 Aug 2014 :  3:34:21 PM  Show Profile  Reply with Quote
Sounds like chevy guys. If your paying the money, you should be able to get the services you want. If there not comfortable or not set up to preform the task, then find another shop.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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beertracker
Cochise

350 Posts

Posted - 19 Aug 2014 :  4:44:13 PM  Show Profile  Reply with Quote
It's a street engine and the shop is chevy guys!! I know, I know pontiac heads in a chevy shop :(

I want a LS engine in my Pontiac
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Latech
Cochise

USA
397 Posts

Posted - 19 Aug 2014 :  8:41:33 PM  Show Profile  Reply with Quote
My machine shop milled my heads .045. He also milled the intake side so any intake can be used and will match up good(and it does).
IIRC he said to machine a third of the amount that the heads were milled, from the facing side of each head.
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beertracker
Cochise

350 Posts

Posted - 20 Aug 2014 :  12:08:13 AM  Show Profile  Reply with Quote
If you want to get into the subject here is something I found on the net.

http://victorylibrary.com/mopar/intake-mill-c.htm

I want a LS engine in my Pontiac
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bnorris_74
Crazy Horse

USA
1442 Posts

Posted - 20 Aug 2014 :  09:13:17 AM  Show Profile  Reply with Quote
quote:
Originally posted by Latech

My machine shop milled my heads .045. He also milled the intake side so any intake can be used and will match up good(and it does).
IIRC he said to machine a third of the amount that the heads were milled, from the facing side of each head.


You mill Pontiac heads the same amount on the intake side as what was removed from the combustion side. If you take .045 off the combustion side you need to take .045 off of the intake mounting side.
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Blued and Painted
Chief PONTIAC

USA
3406 Posts

Posted - 20 Aug 2014 :  10:13:42 AM  Show Profile  Reply with Quote
And a clean up on the exhaust flange. The center divider tends to bulge.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Blued and Painted
Chief PONTIAC

USA
3406 Posts

Posted - 20 Aug 2014 :  11:25:42 AM  Show Profile  Reply with Quote
I would go with one of the Pontiac specific shops. The services will be about the same price just add shipping. Guide stanchions will be cut for positive valve seals. And they will be set up for your cam and combo. To Me, peace of mind is worth a few extra bucks.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.

Edited by - Blued and Painted on 20 Aug 2014 11:26:56 AM
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Mr. P-Body
Running Bear

USA
2258 Posts

Posted - 21 Aug 2014 :  7:20:11 PM  Show Profile  Visit Mr. P-Body's Homepage  Reply with Quote


Raising the roof of the port will not only allow a better alignment, but at the right place. The roof is where the power is.

That being said, if heads are truly stock, milling .040 iosn't going to change things enough to be concerned with.

As a general practice, it's better to remove material from the intake manifold than the intake "side" of the head. If too much is removed from the head, sealing the valley can become a huge adventure. Chevy guys do the head because they don't have the valley to "deal with", but that's only at the lower levels. Modern race engines have intakes "fit".

FWIW

Jim
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beertracker
Cochise

350 Posts

Posted - 23 Aug 2014 :  9:22:16 PM  Show Profile  Reply with Quote
thanks all, good info.

I want a LS engine in my Pontiac
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