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Sorry....it's my B body background flaring up again guess I better put some salve on it lol

There is no difference between a 383 and a 440 manifold

They also had different advance curves and the HP exhaust manifolds

Awww dude...you're gonna make me blush. I have all that info in hard copies, cause I was really in to Maxi's for a while. BUT....I was to lazy to go looking for it last night. However, I had run across that site some time ago, and just had to find it again. Then, I didn't bookmark it...

Not to sound like an ***, but it only took me about 5 minutes to dig up those pics off the internet last night. Go here: http://racehemi.maxwedge.com/topics/heads.php It has pics and info on all the Max Wedge heads. And like my edited post above, the Stage 3 heads have the rocker shaft stands...

Here are some pics

No. those are just 67 440 closed chamber heads

(this is some of the stuff I'm working on forgetting) I think the Stage 3 heads had cast in rocker shaft stands.....but like I said.... I did some checking. Stage 3 heads had the rocker shaft towers cast in them, and had 6 bolt valve covers instead of the 4 like Stage 1 & 2

100% correct

There are no "thin wall" 440 blocks. One of the magazines had blocks tested several years back and the walls are the same thickness. BUT........there are some stiffening ribs on the outside of the block that were left off of the later blocks making them a bit lighter. I would guess that...