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Author Topic:   Milling the intake
MrXerox
Gearhead

Posts: 322
From: Oklahoma City, Oklahoma
Registered: Nov 2000

posted 06-10-2001 10:08 PM     Click Here to See the Profile for MrXerox   Click Here to Email MrXerox     Edit/Delete Message   Reply w/Quote
What is the proper method to check to see if I need to get my intake milled to fit correctly? My heads have been shaved several times over the years and I do not remember how much has been taken off. I want to check and see if I need to get this done before I put it on...

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SteveLaRiviere
Administrator

Posts: 32961
From: Saco, Maine
Registered: May 99

posted 06-11-2001 05:12 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
You set the intake down with the heads on the block and without gaskets and measure how parallel the surfaces are. Without getting a book out, I think it's something like .020" per running inch.

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'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
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steve'66
Gearhead

Posts: 6352
From: Sonoma,CA,USA
Registered: Mar 2000

posted 06-12-2001 06:22 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Mr.X,

Milling the heads will lower your head's intake ports in relation to the intake manifold's ports. Set your intake on and see how the ports line up, use clay for a print. If they are off more than a 1/32" or so, it's time to machine the intake.
{Or, the cheap way is to port the intake to match the head, "move" the bolt holes, and use silicone on the front and rear of the intake.}
Tell your machinist how far off the ports are and let him mill the intake to match.

SteveW

Edited due to thinking of non-sbf heads the first time around!

[This message has been edited by steve'66 (edited 06-12-2001).]

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Moneymaker
Administrator

Posts: 19686
From: Lyons, IL, USA
Registered: May 99

posted 06-12-2001 08:59 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
As Steve L. says and you also should shine a flashlight down the ports and look at the port alignment. Many times you only have to elongate the bolt holes anbd eliminate the end rail gaskets.

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Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member NHRA and IHRA SS/LA national record holder
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