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Old 01-07-2011, 05:40 PM
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3931063 heads?

I have a set, and was wondering if they were a decent head. I did research on them, but I wanted here from other people.
3931063 1969 396 325, 350 2.06/1.72 100.967 Similar to #3909802 & 3917215 with two accessory bosses above #3 (or #6) exhaust ports for air conditioning rear support bracket. Straight casting flashing
Thanks,

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Old 01-07-2011, 09:28 PM
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Yeah! Good heads!
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Old 01-07-2011, 09:30 PM
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in another post did you say they have bigger than stock valves?
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Old 01-07-2011, 09:33 PM
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Quote:
Originally Posted by matts37chev
in another post did you say they have bigger than stock valves?
Yes, that is what I was told when I purchased the car. I tried to get as much info on the motor as I could. Those are the casting numbers for the heads, but bigger valves. I wonder what kind of flow I'm getting?
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Old 01-07-2011, 09:41 PM
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if they do have the bigger valves in them i would run them!
if still stock ? i dont know enough about those castings to guess.
if stock valves, you might think about selling them to help pay for some better ones
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Old 01-07-2011, 09:43 PM
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Quote:
Originally Posted by matts37chev
if they do have the bigger valves in them i would run them!
if still stock ? i dont know enough about those castings to guess.
if stock valves, you might think about selling them to help pay for some better ones
What would be the easiest way to verify the valve size? Pull The Head? I'm sure he wouldn't lie, but you never can tell these days!
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Old 01-07-2011, 09:47 PM
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Quote:
Originally Posted by 396chevelle
What would be the easiest way to verify the valve size? Pull The Head? I'm sure he wouldn't lie, but you never can tell these days!
that would be the only way
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Old 01-07-2011, 09:49 PM
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Quote:
Originally Posted by matts37chev
that would be the only way
I'll pull it to make sure!
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Old 01-07-2011, 09:56 PM
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while you have them off you can look at your pistons to see how much, if any, dome or dish they have.
this will make difference because, most new heads and other good used castings (781/049) are open chamber and lower your comp. ratio, if those that you have now are semi closed.
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Old 01-07-2011, 10:00 PM
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Quote:
Originally Posted by matts37chev
while you have them off you can look at your pistons to see how much, if any, dome or dish they have.
this will make difference because, most new heads and other good used castings (781/049) are open chamber and lower your comp. ratio, if those that you have now are semi closed.
Thanks, for the tip! I'll make sure I take a look. I might as well change the cam while I have it apart!
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Old 01-08-2011, 06:22 AM
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If you have the 063 396 oval port heads you are all set. Don;t worry about wether they have large valves. The stock size 2.07x1.72 valve are fine for aand even prefered for a 550hp street/strip oval port 396.
The 396 cylinder bore is small and gets shrouded with larger valves in closed chamber heads.

the 2.07 valves are the right valve size for your 396 with closed chamber heads. The key is correct head porting.

But the heads need to be correctly ported for power.
The 550hp Joe Sherman built street 396 is build using the 063 heads with stock valve size. (althou they are probabily hi quality Ferrara or Manley SS)

The larger valves work better when on a large bore 427-454+cid motor.

For your purpose, The 2.07 x 1.72 valves are the ones to use on a 396 with the closed chamber type oval port heads.
They flow plenty plenty once correctly ported. Check out the details of that build. It's very simple yet delivers the power using fully ported 063 heads and stock 2.07x 1.72 valve size.

If you are serious and you want to do it right the first time:
You may want to pay someone like Meaux Racing Heads in Louisiana. www.maxracesoftware.com to correctly port your "063" oval port heads....
The cylinder head preparation is key and he can do it right for you.
The rest of the build is pretty basic,

Last edited by F-BIRD'88; 01-08-2011 at 06:39 AM.
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Old 01-08-2011, 08:56 AM
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Quote:
Originally Posted by F-BIRD'88
If you have the 063 396 oval port heads you are all set. Don;t worry about wether they have large valves. The stock size 2.07x1.72 valve are fine for aand even prefered for a 550hp street/strip oval port 396.
The 396 cylinder bore is small and gets shrouded with larger valves in closed chamber heads.

the 2.07 valves are the right valve size for your 396 with closed chamber heads. The key is correct head porting.

But the heads need to be correctly ported for power.
The 550hp Joe Sherman built street 396 is build using the 063 heads with stock valve size. (althou they are probabily hi quality Ferrara or Manley SS)

The larger valves work better when on a large bore 427-454+cid motor.

For your purpose, The 2.07 x 1.72 valves are the ones to use on a 396 with the closed chamber type oval port heads.
They flow plenty plenty once correctly ported. Check out the details of that build. It's very simple yet delivers the power using fully ported 063 heads and stock 2.07x 1.72 valve size.

If you are serious and you want to do it right the first time:
You may want to pay someone like Meaux Racing Heads in Louisiana. www.maxracesoftware.com to correctly port your "063" oval port heads....
The cylinder head preparation is key and he can do it right for you.
The rest of the build is pretty basic,
Thank's guys for the great info! Meaux Racing is only about 4hrs away, so thats not to bad. I have a shop close to my work that is well known and has been around since I was a child. Do you think they would be ok to do the work or is this something that only a few can do right?
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Old 01-08-2011, 09:17 AM
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Quote:
Originally Posted by 396chevelle
Thank's guys for the great info! Meaux Racing is only about 4hrs away, so thats not to bad. I have a shop close to my work that is well known and has been around since I was a child. Do you think they would be ok to do the work or is this something that only a few can do right?
its not magic, but you also dont want the neighbor kid doing it.
talk to them, see what they have to say, you can often get a feel about a machine shop by talking to them and some of their customers.
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Old 01-08-2011, 09:29 AM
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Quote:
Originally Posted by matts37chev
its not magic, but you also dont want the neighbor kid doing it.
talk to them, see what they have to say, you can often get a feel about a machine shop by talking to them and some of their customers.
do some head porting research on the interweb, so you halfway know whats going on before you talk to them.
it will help sort out BS from the actual knowledge
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Old 01-08-2011, 11:23 AM
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I cannot tell you about your local shop.

Remember most automotive machine shops are not trained in the art of porting cylinder heads. Their training is in re-machining and rebuilding.

I recomended Meaux Racing cause they are relatively close to you and are
cylinder head specialists. Talk to them about your cylinder heads or someone like them that is closer to you.

A lot of times I recomend you do your own porting on low buck sbc stuff.
(OEM "junk" SBC heads)
The BBC heads are a little more involved if you have not done them before.
Some things are worth paying for. Getting the heads right on this combo is critical. This is not the head to start out learning on.

Meaux Racing has a internet Forum on their site that you can join and get some good info on. If you want to build/duplicate the Joe Sherman 396, ask there in reference to these threads and the Storm Warning 396 Nova site. They can advise.

Last edited by F-BIRD'88; 01-08-2011 at 11:35 AM.
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