here's a message that was forwarded to me from E. Stange


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Posted by Chris on January 13, 1999 at 08:23:00:

In Reply to: Re: Can you ID this flat head? posted by Bob Fetters on January 13, 1999 at 03:47:41:

the
> long
> block engines are usually 251's or 265's. These blocks measure aprox. 25"
> long
> vs the "short" block which was 23" long. Some of the pre- '52 25" blocks were
> also 236 cubic inches.
> The price sounds right it is ready to run.
> One way to check if it is a 265 is to pull the head (on some heads you can
> remove a bolt that sits on top of the #6 cylinder) turn the engine and check
> the stroke. The 265 has a stroke of 4 3/4" while the 251 has a stroke of 4
> 1/2". Both have a bore of 3 7/16"
> Another way is to compare the rod bolts. The ones on your 265 are unique to
> the 265 and are slightly different than any of the other 25" engine bolts. If
> you have an extra rod bolt from you 265, you can take it over to the new
> engine
> and compare it. Only problem with this is that you have to drop the pan.
>
> Here are some engine block prefixes that indicate a 265 engine. you will find
> these as the first 3-54 digits on the left front side of the block juston a
> flat side just below the head and behind the water pump:
> 6-265
> TP-26
> TR-26
> TS-26
> IND 265
> IND 33
> IND 32
> IND 16A.
> If it is from a 52-54 Chrysler auto the pre-fix will begin with:
> C52-
> C53-
> C54-
> Hope this is of some help on determining a 265.
> To recap:
> 1) Try checking the stroke to see if it is 4 3/4"
> 2) Remove the oil pan and check to see if it has the unique rod bolt.
> 3) Check the prefix on the engine number (My list is not complete on the
> engine
> prefixs
> If it is a 265 and is in decent shape, I'd grab it. Rods and crank themselves
> are worth $150 - $250. Since even if th eblock is bad, you can drop them into
> any 251 and you have an instant 265!



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