RE: 440 blocks

[Bob Fortson <bobt1885@xxxxxxxxx>]

It is my understanding the difference is in the heads
on a "Magnum" block...The magnum had a larger exhaust
valve (1.74 I think!) and a better flowing pocket.
This began in the 915 head casting in 1967 and
continued until the 906 was introduced in 1968...the
906 had the standard 2.08 intake and the 1.74 exhaust
was made standard. The combustion chamber was now an
open 88 cc design. This was standard in ALL RB/B
despite the misconception that it was only in "Magnum"
applications. This was due to advertiseing claims of
the day. The only difference was the Magnum's had
stiffer valve springs stock. The 346 head was introd.
in 1971 on all B/RB engines. This was a smog
head...and not very performance oriented. It was raced
in NASCAR with many modifications in these years.

Hope this helps.
Bob Fortson

--- ledman_70@xxxxxxxxxxx wrote:

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> 
> Thanks for the info everyone. So, there is no real
> difference between a 
> 440 Magnum block and a 6-pack block? Are they marked
> the same?
> Jeff
> Joeydahook9@xxxxxxx wrote:
> > 
> > 
> > Jeff - the F means 1970 and the numbers 2 13 and 1
> 9 are the month and 
> > day  
> > of the engine build date.  Mopar stamped engines
> with HP2.  I cannot  
> > find a 
> > designator for a six pack engine.  Joe
> > 
> > [Non-text portions of this message have been
> removed]
> > 
> 
> 
> 
> Jeff Adams
> 64 Polara
> 
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