Dinsdale wrote:

> 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.
>
>

Agree, the 4bbl heads are too big for the street, typically. Check your
references - the '73 Q code very well could have the 2bbl heads, which
are huge to begin with, leading into the "smog" motor era...

Rob