Port & Polish Questions???

[rclifton]

So I got the port and polish kit from jegs, and I'm about ready to start porting my AFR 165's. I'm am not working and insurance is not on the car so I wanna do something to make it run a lil better. Anyone with experience, How hard is it? Can I do it with a die grinder? What do yall use to keep the chamber's equal?

 

[bentley429]

I am not about to tell you how to do it, but I would think it would be a good idea to practice on some junk heads first.

 

[rclifton]

I plan on trying the lower intake first. I don't really have any aluminum heads just lying around. I don't plan on doing much, just shining them up a bit? If I screw them up, oh well! Then I'll just put them on E-Bay!

 

[clement]

if you dont know what you are doing i suggest you leave them alone. its possible to **** them up in a hurry. have someone that knows what they are doing give those heads a valvejob and have them blend the VJ into the bowl instead of taking a dremel to your $1400 heads.

the heads need a rough finish to create a boundery layer of air for airspeed. if you polish them you will kill port velocity and itll likely run worse.

 

[Mr. Rustypwnz]

AGREED!! if you have never done this (your posting up on what to do so thats what were set to believe) please go get a crap aluminum stock 5.0 intake if you have one and practice on.

whats your combo set up like? if its nothing but an ots cam and a eddy intake (avatar pic) you will not pick up really any seat of the pants power. I would do some bowl blending and thats about it.

The way I leaned is trial and error with some e7's I noticed slight improvements with every set I did. Then went to gt series heads. still screwing with some of those and e7's.

but the best way to do it is do some iron heads and measure the intake ports with water (cc) as you go along. This way everyone is the same.

 

[phutch11]

Go for it. Fortune favors the bold.

Remember that less is more with head porting. Do a ton of research first - read everything that Tmoss has to say on it and then go to town.

Good luck...

Posted via Mobile Device

 

[90blacknight]

Don't practice on those heads!! I'm with the others who said to get a set of junkers.

 

[rclifton]

Thanks for the input guys! Gonna work with the stock intake some later tonight. I know to stay away from the valve seets, but is there anything thats off limits? Should I measure the intake (cc) and try to match the heads, or are they about the same now?

 

[jrichker]

The AFR heads are CNC ported as shipped. It is very doubtful that you would be able to make a consistent improvement to them. CNC machining uses a multi axis computer numerically controlled machine to port each port to maximum flow and every port flows the same amount of air and has the same port volume.

See 5 axis CNC Cylinder Head Porting Machine. Digitize and CNC port Intake, Exhaust ports, and Combustion chambers. to learn more about CNC cylinder head porting. It is truly amazing what this process can do.

If the still picture isn't visable on your PC, see the movie version - CENTROID CNC Video CNC Cylinder Head porting video with 5 axis CNC milliing machine. All I can say is WOW!!!

If you want to play around and port some iron heads yourself, see diyPorting.com for lots of good information

 

[5spd GT]

I agree with the rest of the guys.

Understanding the short turn, swirl needed, and tinkering with the different cross sections is asking for a good chance to see no resale value and adding very little gains to no gain to worse power gains.

Do not polish an intake. This of course is more critical on CARB intake.

 

[white 89 GT]

Sounds like you want to ruin a set of good heads.

 

[rednotch88]

IMO I say don't touch them.! Your asking for un-even flow numbers,and problems,also not really knowing what your doing with no experience, I been porting heads,cutting upper intakes in half to port,also ported alot of world heads at my CnC shop,but never touched a set of AFR's. I have been doing this almost every day for 5 years.
sorry I gada scurry girlfriend hates me on here.
Later guys

 

[tmoss]

you don't have the expereince to make the heads better - run them as-is. Practice on some E7 or GT40 heads.