Waiting for confirmation, but Muscle Motors is supposed to have a CNC program for the 906 head. The bottom will still be $ vs reasonable results.

Uuuuuuummmm....... Isn't Muscle Motors closing the doors?

I can't imagine having a set of 906's CNC'd is going to be less $$$ in the long run than a set of E-street heads........ But I'm curious to hear what the number is.

I believe KG Engines also has a CNC program for 906's.

KG offers a standard port window CNC 906 and also a Max wedge port CNC 906.

Maybe someday a set of those will find their way into my shop for some reason or another...... And if they do....... A little trip to the flow bench will ensue.

I had a set that came from MM here a few years ago.
2.19" intake valve...... Worked pretty well.

I currently have a set of the standard port KG cnc 906s on my stock stroke 440. They work well I must say. 10.42@129 is my current best with traction issues. I have a set of the max wedge ones on the way and hope to have them on the car in a couple weeks. The rest of the engine besides the intake will remain the same. I am currently running a Victor intake and plan on trying a 337 M-1 and 440-2 with the MW heads. I'll post the results after they are installed and able to try both intakes.

I still have my set of 906 heads that went 9.80's with a stock 440 crank and rods and .030 over TRW pistons on a shelf. Maybe they will make a come back and be worth something. Lol

Did they happen to come with a flow sheet?

No flow sheet included.

Fast,
Good solid info as always. What pushed me to buy Edelbrocks was the fact that we lost 2 sets of 906s and a set of 915s to cracking, leaking after they had been heavily ported. We ran them for five or six years, then they were junk, and our investment was out the window. We've had that original set of Edelbrock RPMs since 2002, ran them on four different engines, two of which expired under them, and they are still going strong, so I can't see investing all that time and money into 40 year old castings anymore.

That's what happened to my good 906 heads that I still have but it was MY fault. Back then I always took a minimum .40 cut off the block and we would also cut the heads. I ran this set of heads MANY years and during a rebuild I didn't notice the dowl pins setting high and I cracked the head tightening it down when the dowl bottomed out. It started leaking at the Halloween Classic and I dumped a can of K&W block seal in it and ran them for 6 more races with zero issues but I haven't ever tried them since. I keep saying this but one of these days I would love to do a valve job and throw them on my flowbench. To this day I warn guys to set their heads on to make sure the head sits flush.

Billy..... I'm with you 100%.

I've thrown away countless ported iron bb mopar heads over the years, and some of them were very very nice heads, due to cracking.

Probably the nicest set I ever did myself went on a high level FAST build.
Motor made really good power, car went pretty fast.
It started using a little water pretty early on. The heads came off for some unrelated issue and got sent back to me for a look over.
There was a crack opened up right across the intake seat. No mag test needed for that one.
Had dyno time and maybe 20 passes on it.

The two main failure points seem to be, on the exterior under the center 2 ex ports, and in the chambers across the intake seats.

I'll tell you this...... Those high cr FAST strokers with short duration cams seemed to be extra tough on those heads.
I have a feeling that 260+lbs cranking pressure has something to do with it.

Wow, 30 posts and 700 views on home porting 50 year old crack prone scrap iron heads. Do we get another thread on when to use a 509 cam vs a 590 next?

I think now that mp has decided that the 509-108 cams are now worth their weight in gold, you may finally see them fall out of favor

They are expensive so they must be good, right?!

If you can get 906/452's CNC'd cheap as filler work to keep the 5-axis making money, I'd see them for street meat and cheater parts for cars that need to look stock.

To me, if I can just get the porting done for say $500'ish, I'd be game. I can do valve's, seats, guides, and blending, I just hate hunching over cast iron for hours.

It's not time sensitive, I'm not one of these A-holes screaming about needing their parts yesterday (because they're clowns who can't plan ahead after burning their junk up because they can't tune either.) S/F....Ken M

While I'm curious to know what KG or MM charges for the CNC part of the job, I'm not curious enough to call and find out...... Although I'd be shocked if it was something like $500.

The cheapest I can imagine it costing is like $800-900....... But I don't have a CNC machine to feed.

That being said, I thought someone told me they saw KG at a Mopar show with a display of bb and sb CNC heads for what sounded like pretty reasonable money.

$750 for aluminum head CNC is what I paid.

Unless your class requires it, I would trash the cast iron BB heads and use painted Stealths. The average person cannot tell the difference..

I think cnc'ing the iron is a little tougher on the cutters, and you probably can't cut as fast or as deep...... So it should just take longer.
I'm not certain of this...... Just how I imagine it is.

If that's correct...... It would seem like it "should" cost more to do the iron heads.

There are Dart SBC heads that are essentially the same, available in aluminum or iron.
I wonder if they cost the same to get CNC ported?

I know it's more difficult, I know there's more wear, although that isn't all that much with non-stupid feed rates. I also know that unless you have a backlog of business, $500 minus actual costs is more than 0 dollars. Very few machine shops have more business than they can handle. Most of the ones I know take a lot of time because they're run poorly ie disorganized.

Like so much, pricing is contingent on costs of doing business and what the market will bear. S/F....Ken M

When I talked with K&G over the Winter, they told me $1500 for a complete, ready to run set of 906's if I supplied the heads. That included the standard port window CNC program and new Ferrea 2.14 valves. I don't remember any more details about the work or anything else about the parts. He said that they flow in the low 280's; I want to say it was 283 or 4 (I don't know at what lift that number was recorded at). I've not seen a flow sheet. Very nice guys and I must say, it is tempting to me given the type of car I have.

I've spoken with a few people that have nothing but good things to say about K&G including one with a budget type 68 or 69 Road Runner that said their car picked up a second in the quarter going from basic rebuilt 906's to K&G's CNC'd 906's.