Exhaust pic

Chamber shot

Next

Worth spending the dough?

I guess that depends on how much you're willing to spend to get them ready to run, and what your expectations are from them.

If you're trying to make 700hp+, I'd say use something else.
Depending on exactly what it would take to make those a ready to bolt on pair of heads, and you were looking to make under 700hp...... Then they might be worth it.

At a minimum they need $500-600 worth of parts, someone to measure everything up, check the valve job, more than likely need surfacing, etc...... It's an easy $1000 bill if there are no major issues.
Without being able to evaluate the short turn work, I'd say those would probably flow in the 285-300cfm range as they are..... If the short turn is decent.
You could easily spend another $200-300 detailing the port work a bit.

The chambers look kinda deep........ Wouldn't surprise me a bit if they were in the 90cc range.
Might want to grab a head gasket and set it on there and see if there is an overhang issue.

Sounds reasonable. I'll send you a pm.

Dwayne is giving you good advice , I'll add one thing I learned ...

Put them BOTH on a block before you do anything , make sure they drop on the dowel pins AND that you can get ALL the head bolts in. I had a set of the 383/440 street castings ... Stage 6 core based ... one head was ok , the other head dropped on the dowel pins and only 2 head bolts would go in, the dowel pin holes were drilled at an angle.

Those heads would have maximum value on a 600hp engine built on a 400 block. The chambers do appear deep so let's assume they are indeed 90cc. They would give a comp ratio between 10.0 and 10.5:1 using a zero deck flattop piston and 0.039" gasket. Probably run on midgrade. The combustion chamber general shape isn't bad.
Putting them on a 400 block lets you use a 440 intake and that opens up more choices, and I believe better choices.

Oil collecting in the extra-deep valve spring pockets could be drained off with a hand drill or a die grinder with a cutoff wheel. Slots just have to work, they don't have to be precise.

That's my

R.

I have an interesting set I got from 440Jim.

Dwayne may remember them as they were a joint effort by Dwayne, Dan Costello, and Ryan J.

Real Cool Epoxied heart shaped runners and relocated ports to MW/Indy.
Maybe Dwayne recalls the flow #'s. I havent used them yet.

These will be going on a Mopar 575 hp, stage 6 head crate engine, that has been untouched, sans a set of Harlan sharp 1.6 rockers. It should be a bolt on application when done. Just looking to better my flow.

I love it when guys say stage 6 heads will only put out 600 horsepower. I'll have to tell my Friend that run 9's in his street legal Duster. LOL Trust me, in the right hands they will surpass that number.

I had them on my 70 440-6 charger. They did have some work and they were milled to 78cc.... They ran great for me and they don't look like big blocks of metal like some aftermarket heads.

Same here. I was trying to recall if MP ever listed a CNC-ported Stage VI prior to the Chapman offerings, but I simply don't know.

CNC'd or not, they still look like they could benefit from a good bit of in the ports. Lots of drop-outs where the cutter isn't even close to the casting, so it must have been a pretty conservative program, too.

You're not planning on running that crate engine w/o tearing it down & inspecting everything, are you? Some of the MP crate engines were real P's of S that need significant fixing before they should have ever been started. Very scary...

I have run this engine straight out of the crate with no significant inspection since the day I got it back in 1997. I have had no issues other than slow et's

Dwayne that set of heads you did for me are still on the same 498 short block running 10.2's in SoDak. I sold the car to a friend of mine noting that it was a "roller that runs".... it was tired and needed a new short block and the heads freshened. It ran a string of 9.93 passes at Famoso prior to the sale. He ran it for two years and sold it... it's still getting beat on the last I heard. That was the most docile engine I've ever had. Shift light set at 5600, trapped at 6200. Low rpm, easy on parts (most of them stock.... LY rods, factory main caps, stock welded stroker crank). Great running mill in a 3380 big car.

I'm sure many a Mopar 575hp crate motor owner would be happy with an 11.27 @ 118 time slip(unless it was in a 2200lb car).
Depending on the overall combo and where you're racing, that doesn't seem that bad at all to me.

Jay..... Sounds like everyone has gotten their money's worth out of that thing!!

440Pursuit....... The credit for that intake port layout goes to Mike Doty. He's the one that came up with that.
From memory, I think those heads flowed around 340. The best non-Chapman stage 6's I've seen. About 700hp from a 470 with a flat tappet cam on pump gas.

In my 2001 catalog I show a few different options for ported stage 6's.
P4876186- assy with 2.14/1.81 valves
P4876187- assy with 2.18/1.81 valves

They show 2 different CNC ported heads "machined for 2.18 intake and 1.81 exhaust" valves, but then the two different part numbers are listed as either:
P4876382- flat tappet cam(lifts up to .650)
P4876383- roller tappet cam(lifts over .600)
With a foot note stating that MW heads require offset pushrods.

If I had to guess....... I'd say the description of those two part numbers is incorrect.
I think they are bare heads and that one was std port and the other MW port.
(I realize these two numbers at one point were used for the Chapman heads, but I didn't think had arrived on the scene yet in 2001)

There is also number P4876991, which is listed as a service replacement assy for the 575hp crate motor.......90cc chamber.

And P5007484- "hi ratio assy, 78cc chamber"

Blofish, what part number is on the box for the heads you have?

Right; They were released in 2003... just in time for Steve Dulcich to get a set for that year's Engine Masters event (after the Moparts.com team had been told they wouldn't be legal, IIRC).

Oh, I had (have?) the flow #s for the Moparts EMC Stage VI heads... somewhere. Best as I can recall, they peaked about 345 on the intakes, pretty much what you said.

The 469" enginemasters entry made over 700hp, those heads had some interesting work done to them. If I remember right they flowed about 330cfm before Dwayne tweaked them after I sold them to Jim.