Head Porting

[mojavered]

When it comes to porting aluminum heads, how much more beneficial is it to have then CNC'd than have them hand ported?  The heads in question are EZ heads.  The motor is ran on the street and just wondering how much better the results would be having them done by Indy instead of by hand?  Thanks.

[Chryco Psycho]

I have no direct comparison , a bad port job can ruin a set of heads & have them flow less than unported heads , I have seen it happen . A good job should get very similar results

[mojavered]

Thanks CP
I have the Indy EZ heads with the 270 cc intake port volume.  I was thinking about getting them ported out to hopefully a 290-295 window and flowing around 350-355 cfm.  That is what is offered by Indy in their "Little EZ" heads.  Has anyone had their EZ heads ported by someone other than Indy?  My heads currently flow 278 cfm @ .600".  Just wondering what I might be able to expect.  Thanks.

[Strawdawg]

cnc porting provides a consistent, economical avenue to porting.  A good hand porter will take a set of cnc heads and make them better, but, it will cost you.  Or he will take a set of stock heads and make them better, but, it will cost even more and take longer.   Emphasis on the word good.

[mopar12372]

IMOP  why would you port them ? do you have a stroker ? what size cam ?  ect

[Road_Runner]

IMOP  why would you port them ? do you have a stroker ? what size cam ?  ect

That's been a question of mine as well.  At what point does a set of good aftermarket heads such as the Indy, Edelbrock or Stealth BB heads or RHS SB heads need porting.  I'm looking at all these for my two Mopars and wonder if off-the-shelf is OK, or am I leaving horsepower on the table if I don't port them?...

Later, Jim

[mopar12372]

my point ,  clean up the casting flash?  the heads flow pretty damn good out of the box and besides the fact youll loose power if the ports are too big anyway . maybe check the valve guides and valvae job and bolt them on and go.

[Jesus H Chrysler]

 

I took my Edelbrocks out of the box and I think (personally) they looked horrible!  The casting flash inside the ports was about 1/8 inch deep in some places!    Looks to me that it will cause lots of turbulence through the port.  I'm not "porting" them per se, just smoothing out the rough casting.  I'm wondering however if removing the casting will put me in the position Chryco mentioned about having them flow worse.

[72cudamaan]

Changing the port configuration could possibly disrupt the flow
pattern, but cleaning up the casting flashing will be fine. Think of ot this way.
The ports were designed and tested without the flashing, so you're just
putting the flow back to spec's.

[Aussie Challenger]

Eddy heads are getting a reputation for poor quality control, ports not lining up properly, casting flashing etc.   
I hear from most who have dismantled them and checked them before fitting say they are glad they did so the problems could be fixed first instead of having to remove and refit a second time. It seems to defeat the purpose of buying new heads if you need to overhaul them first, or at least the eddys anyway.   

[Chryco Psycho]

I agree , removing lumps & flashing will always help flow with poorly cast heads , the critical point is floor , you can kill flow messing with flow