BlackBetty93GT

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

r.barn

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.

BlackBetty93GT

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

aode08

the cost to do that nowdays is too expensive, get some aftermarket heads

BlackBetty93GT

how much does that usually cost?

r.barn

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.

w8less

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

BlackBetty93GT

hmm aight so maybe i should be looking into aftermarket heads...what isa good street set?

r.barn

AFR's come CNC ported from the factory right out of the box.
money well spent.

BlackBetty93GT

how much do afrs cost?