906 heads and 740+ NA horsepower?

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IQ52

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I had to pull the 906 "boat anchor" heads from the shelf yesterday and strip them, so I thought I might as well take some pictures of them as we had no pictures from years before. In 2011 we used them in a Mopar Muscle Magazine dyno contest at Comp Cams and they have been sitting lonely on the shelf since then.

We called them the "boat anchors" because we had gotten more flow from them in earlier years.......tried some other things on them.......and lost flow. Threw them on the junk pile and called them "boat anchors".

When the dyno contest came up they were still the best flowing iron heads we had at the time (since then too it turns out) so we hauled them out of the scrap pile and dressed them up.

We are doing another set of less intense 906 heads now and we thought we might be able to use these for reference while doing the new 906's.

Anyway, here are the "boat anchors" that at one time went 748 HP on a 500" wedge.

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Nice work there! I like the 906 heads for an ol' school build. If you can pick up a set already ported w/bowl work completed for a reasonable price I'd use them! 65'
 
Plymouth 65 said:
Nice work there! I like the 906 heads for an ol' school build. If you can pick up a set already ported w/bowl work completed for a reasonable price I'd use them! 65'
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What's a reasonable price on a complete fresh ported 906's
 
LO23M8B said:
What's a reasonable price on a complete fresh ported 906's
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Great question, I paid $850. Truthfully, for a few hundred dollars more you can purchase a new set of aluminium heads. That's why most people go that route. 65'
 
496 polara said:
That looks like a whole lot of time to get those results.
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You cannot imagine.

LO23M8B said:
What's a reasonable price on a complete fresh ported 906's
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Who is determining reasonable?

Plymouth 65 said:
Great question, I paid $850. Truthfully, for a few hundred dollars more you can purchase a new set of aluminium heads. That's why most people go that route. 65'
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$850? Not a chance here. Try a minimum of 2x that........to around 4x that amount.......if you provide good, clean cores.
 
I still have a set of 906 heads that I ran 9.80’s @ 2800 pounds back in the 1980’s. This was on a stock crank, stock rod, TRW piston engine. They will probably get junked after I’m dead and gone but I just never cared to sell them. They could even be better today with smaller valves (still 3/8 stem).
 
I think I have done my last “big porting job” on stock iron heads.
 
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PRH said:
I think I have done my last “big porting” job on stock iron heads.
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I don’t like to use the word never so how does hopefully never again sound. I have always wondered what my old heads flow but I wouldn’t even try them without a quick buff and valve job.
 
IQ52 said:
You cannot imagine.



Who is determining reasonable?



$850? Not a chance here. Try a minimum of 2x that........to around 4x that amount.......if you provide good, clean cores.
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Yep. I tell them go buy those aluminum heads then. There arent many 'decent' flowing heads for under 2k anymore.
The power expectations have gone up.
 
IQ52 said:
You cannot imagine.



Who is determining reasonable?



$850? Not a chance here. Try a minimum of 2x that........to around 4x that amount.......if you provide good, clean cores.
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Not big block, but what's the highest flow you've found using 1.94 intake valve with any brand small block head ?
 
Let me know which lake you're throwing those boat anchors into and I'll grab my scuba gear:)
 
Good luck, he'd probably dump them in a Alpine lake in the Sawtooth's before he let's anyone get to close for inspection. :lol:
 
IQ52 said:
I had to pull the 906 "boat anchor" heads from the shelf yesterday and strip them, so I thought I might as well take some pictures of them as we had no pictures from years before. In 2011 we used them in a Mopar Muscle Magazine dyno contest at Comp Cams and they have been sitting lonely on the shelf since then.
If you don't mind what did they flow?
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I've been pooh-poohed enough on the claimed flows.

I'll just say they do make the 748 HP on the 91 octane pump gas, 11.9:1, 500" engine.

And 694 HP on the 91 octane pump gas, 9.7:1 compression, 451" engine.

There are enough guesses out there on how many horsepower you can get per cfm.
 
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