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Old 07-19-2006, 11:07 AM
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383 heads vs. 440 heads

What's the basic difference between the 383 and the 440 heads. What is the performance advantage of using 440 heads on a 383, chamber volume? valve size? chamber geometry?

George

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Old 07-19-2006, 03:36 PM
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Not much of a mopar guy, but here is a page with some casting numbers and coresponding specs for all the diffrent heads.

Here is a little more info pulled from this site.

All "B" and "RB" engine cylinder heads are interchangable. The only problem arises in trying to use Stage I, II or III Heads (413-426 Max-Wedge) on the 383 or 400 "B" engine because there is no intake manifold available for this combination.

"There have been many "B" engine heads since 1958. The early "B" engine (up to 1961) used a head with 1.95" intake valves and 1.60" exhaust valves. "B" engine heads (up to) 1963 had only four valve cover attaching bolts and used aluminum rocker shaft attaching brackets. The standard 1962 head had a 2.08" intake valve but retained the 1.60" exhaust valve. Several early "B" engine high performance heads, like the 300J Head, used a 2.08" intake valve and a 1.74" exhaust valve. In 1963 and 1964, the six cover attaching bolts and cast-in rocker stands were introduced and are still in use today."

Wish I had a little more for ya!
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Old 07-19-2006, 03:49 PM
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I'm not really a Mopar guy either, but I plan to be. I acquired this '41 Dodge 3-window coupe that I plan to drop a 383/727/Dana 60 combo into, and someone said to consider the 440 head option for some additional horsepower. BUT, that's about all I know at the moment...that they are interchangeable. I'll keep looking...

George
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Old 07-19-2006, 04:49 PM
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440 heads on a 383 was the old hot ticket for the Mopar's. Mopar did it first and called it the 383 Commando but people later found out about it and did it themselves. my dad had a '68 Cornet 383 with 440 heads he aquired and put on, said it made a huge diffrence.
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Old 07-19-2006, 06:11 PM
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There may be a difference in chamber volume in the earlier closed chamber (pre-smog) heads but as far as I know the differences in the "open chamber" heads are slight. Most B/RB heads (post smog with hardened seats) could be found on either 383's or 440's depending on year so the term "440" heads post smog doesn't mean much. That said, some of the smog heads do breath a bit better than others. I'm building a 451 stroker using 452 castings. Another popular casting are the 906's.
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Old 07-19-2006, 06:30 PM
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906 heads

All the high performance 383 and 440's came with the same H.P 906 heads.
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Old 07-20-2006, 10:51 AM
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OK...the donor car is a '65 Fury III, pre smog I presume. Are the HP improvements going to be substantial if I use pre smog 440 heads? I'm thinking yes if I read the thread responses right.
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Old 07-20-2006, 09:46 PM
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They will improve your compression ratio somewhat I believe and they will probably breath a bit better, however you'll want to have hardened seats installed for the exhaust valves at a minimum to burn unleaded fuel.
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Old 07-20-2006, 10:45 PM
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Quote:
Originally Posted by 35chev/302gmc
All the high performance 383 and 440's came with the same H.P 906 heads.
The 2843906 heads were on all 1968 to 1970 big blocks, 383 2 bbl to 440 6bbl.

The 440 TNT head for 1967 was the 915, it was 2.08 intake 1.74 exhaust, "closed" chamber.

1965 big block would be the 2406516 heads, which were- if I remember correctly- 2.08 intake and 1.60 exhaust with a 6 bolt valve cover rail.

The later heads compatible with unleaded gas were induction hardened seats, a substantial valve grind could remove the hardening.
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Old 07-21-2006, 08:23 AM
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Quote:
Originally Posted by Centerline
They will improve your compression ratio somewhat I believe and they will probably breath a bit better, however you'll want to have hardened seats installed for the exhaust valves at a minimum to burn unleaded fuel.
The hardened seats are a given...

I think I have all the information I need now. Thanks for all the discussion.

George
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Old 12-13-2006, 12:33 PM
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Just wondering if this guy ever got this project fired off? If not Look for any late model 400 heads or I even heard that the motor home heads are pretty good. As far as flow goes for the most part the later so called smog heads work pretty well. After that its all that Max Wedge and stage 1, 2 and 3 stuff. Now the aftermarket is filled with anything your heart or engine desires.
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Old 12-14-2006, 11:01 PM
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Nothing wrong at all with the later model heads, the 452 heads are used in performance applications for relatively high HP stuff all the time... as far as production heads go they are decent heads.
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