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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 01-12-2007, 07:37 PM   #1
BlackBetty93GT
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Default What is porting,polishing, and milling>

What exactly is a port and polish job? What does it do? How much does it cost? What does it mean to get your heads milled? Are they the same thing?

Thanks..sorry im a young buck and was just wondering
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Old 01-12-2007, 07:40 PM   #2
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Default RE: What is porting,polishing, and milling>

porting: grind out material to make the intake runnner a large opening - more air can get in = more power

polishing: polish intake runner for super smooth surface. - more air flows in easier = more power

milling: cut down the bottom surface of the head, this will make the combustion
chamber of the head smaller and raise compression for a gain in hp.
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Old 01-12-2007, 07:44 PM   #3
BlackBetty93GT
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Default RE: What is porting,polishing, and milling>

so would i be better off gettin gt40 heads and intake from a 96 explorer and porting/poishing/and milling them, or just buy new aftermarket stuff
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Old 01-12-2007, 07:48 PM   #4
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Default RE: What is porting,polishing, and milling>

the cost to do that nowdays is too expensive, get some aftermarket heads
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Old 01-12-2007, 07:49 PM   #5
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Default RE: What is porting,polishing, and milling>

how much does that usually cost?
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Old 01-12-2007, 07:55 PM   #6
r.barn
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Default RE: What is porting,polishing, and milling>

porting can run $300-$1000
same for milling

porting was more of an old school thing back in the 80's and earlier to make the
old iron heads flow better.

Now-a-days we have nice aftermarket aluminum heads to turn to.

You will also see stuff listed as "CNC Ported", that means a computer
controled machine did the work vs. some guy at a bench with an air grinder.


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Old 01-12-2007, 08:02 PM   #7
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Default RE: What is porting,polishing, and milling>

when i had my stock heads reworked it was expenseve..


first shop........
i bought manly valves 400 bucks
comp cams springs 100 bucks
ported milled $400 bucks

took it a shop that a new someone of to check over the work. first shop screwed it up and u could look through the exhaust and see daylight. and they screwed up my valves but they replaced them

took it the other shop had the heads fixed and a 3 angle valve job done and port matched the gaskets

another 400 bucks

with the money i spent i could have bought some high flowing aluminum heads
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Old 01-12-2007, 08:05 PM   #8
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Default RE: What is porting,polishing, and milling>

hmm aight so maybe i should be looking into aftermarket heads...what isa good street set?
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Old 01-12-2007, 08:06 PM   #9
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Default RE: What is porting,polishing, and milling>

AFR's come CNC ported from the factory right out of the box.
money well spent.
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Old 01-12-2007, 08:07 PM   #10
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Default RE: What is porting,polishing, and milling>

how much do afrs cost?
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BBK Ceramic Equal Length Headers
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Old 01-12-2007, 08:07 PM
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