On Fri, 12 Nov 2004 14:50:23 -0500, "Dean" >
wrote:

>Found a Q code 73 Mach-1 in a salvage yard. Not much left of the car, but
>got the engine and trans for $325. When I got the engine home checked the
>casting number on the block D2AE-CA this checked out, Intake manifold was
>4bbl spreadbore. All seemed good until I checked the Heads. They had a 2 in
>the corners, which means 2bbl heads. So you mean to tell me that someone
>removed the 4bbl heads and placed 2bbl heads back on, and left the 4 bolt
>main block and 4bbl intake. I guess this is possible. Was planning on
>placing this in my 71 coupe and taking out the original 302. I guess my
>guestion is, is this how you tell the difference between 2bbl and 4bbl heads
>on a cleveland?
>
> Thanks Dean.
>

That is how you tell the difference...that and the larger port sizes
on a 4v.

Here's a page with some casting numbers:
http://home.comcast.net/~jelerath/mu.../heads-fr.html


It's been my understanding that 2v heads have more low-end and the 4v
heads make their power high in the RPM range.