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What is porting,polishing, and milling>

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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
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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
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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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Old 01-12-2007, 08:08 PM   #11
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Default RE: What is porting,polishing, and milling>

really i thought that was just there castings. i thought they had another option for a cnc porting
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Old 01-12-2007, 08:13 PM   #12
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Default RE: What is porting,polishing, and milling>

if i got new heads i wouldnt have to get a new cam right?
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Old 01-12-2007, 08:13 PM   #13
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Default RE: What is porting,polishing, and milling>

AFR's run about 1400$ a pair, depending on the size of them. Unless your going FI then id stock with the 165cc. Not to hijack, but If i did a P&P of gt-40's how would it flow compared to some aluminum heads?
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Old 01-12-2007, 08:16 PM   #14
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Default RE: What is porting,polishing, and milling>

yeah would the flow be the same worse or better
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Old 01-12-2007, 08:41 PM   #15
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Default RE: What is porting,polishing, and milling>

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ORIGINAL: MustangMadness7

AFR's run about 1400$ a pair, depending on the size of them. Unless your going FI then id stock with the 165cc. Not to hijack, but If i did a P&P of gt-40's how would it flow compared to some aluminum heads?
head flow chart.
a good port job can get stock heads to flow about 220

Click the image to open in full size.
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Old 01-12-2007, 08:56 PM   #16
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Default RE: What is porting,polishing, and milling>

thats good info...but from what i understand i could P&P and mill gt-40's and flow better than anything on there
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Old 01-12-2007, 09:45 PM   #17
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Default RE: What is porting,polishing, and milling>

bump
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Old 01-13-2007, 01:04 PM   #18
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Default RE: What is porting,polishing, and milling>

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ORIGINAL: BlackBetty93GT

thats good info...but from what i understand i could P&P and mill gt-40's and flow better than anything on there
They'll still be heavy iron heads, but also if you port and polish those heads, that's about as much as you'll ever get out of em. Get some light aluminum heads that would flow roughly equally (and for the same cost), and if you want to p/p those later you'll have an even better setup. Go w/ aluminums, IMO
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Old 01-13-2007, 01:16 PM   #19
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Default RE: What is porting,polishing, and milling>

I had a set of E7TE heads done and the cost would have been outrageous. The shop I had them worked at did alot of 4cyl road race heads for people all over the world. The shop gets $3000-$4500 for a 4 cyl head! That doesn't include parts. These guys weren't like your run of the mill machine shop they were cylinder head only. They told me polishing actually hinders air flow. You want a rough surface or a grooved surface. I traded out work with the shop to do my heads and they put alot of man ours into them, used bigger valves, reshaped the combustion chamber for more compression and to unshroud the valves and they still didn't flow as good as AFR 165s CNC ported.
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Old 01-13-2007, 01:50 PM   #20
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Default RE: What is porting,polishing, and milling>

Quote:
ORIGINAL: Jasperstang308

really i thought that was just there castings. i thought they had another option for a cnc porting
No, I'm pretty sure the 165's are CNC ported. The TW's have a CNC port that runs about 500-600 more than the regular TW's......

Blackbetty-- You don't need to swap your cam, but a lot of people do since they have it all apart anyway. You can find a good Trickflow Stage 1 for $100 or so. Also, Central Florida Motorsports has (or had) AFR's for $1278 shipped (c-f-m.com). That's the cheapest I've seen them anywhere, but you might call Dave from jdsperformance.com and see what he can do...he's always got really good deals that he can't advertise online.......
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Old 01-13-2007, 01:50 PM
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