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Back in the day, even in Nebraska, 383s and 440s came with the same head castings. So all the ports were the same in any model year. There isn't any such thing as 440-sized or 383-sized ports. It's not like the chevy world.

Exception: In 1967 there was the 516 head and the 915 head, these were a little different in flow, and there were some 915s that had larger exhaust valves than other 915s.

There are probably some other examples that nit-pickers will focus on, so be it. One of the reasons that I like Mopars so much is that when you buy a 440 from a '69 New Yorker, it has the same head, crank, block and rods as the high-performance ones. You need to change camshaft, carburetor and exhaust manifolds. A double roller timing set and a heavy duty set of valve springs complete the transformation from regular performance to high performance.

R.

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You're preachin to the choir buddy. Learned all that trivia when I got into Mopars in the mid 80's.

It's just easier to type "440" ports than "standard wedge" ports...just like "max wedge" is abbreviated as "MW". There's no misunderstanding, just lazy typing

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Actually, I have a set on the porting bench right now. Todd from CompWedge Engines and I are doing a joint venture of sorts with them. I will have a nice street/ strip 440 going on my dyno in the near future with a set of these Sidewinder heads to see how everything works out.
I hope to get some e.t. numbers shortly thereafter.
I'll update everyone as soon as I have more to tell.
Keith

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Would love to hear how they run in the real world.