Howard, Check the block casting number. If it's 3733340 or 3837012 it's
a 261 with a 3.75 bore. The head casting should be 3703570 or 3836850.
Block casting 3836233 or 3837004 will be a 235 with a 3.56 bore. Head #
3835913 or 3836848. If you get any other numbers send them to me and
I'll find out what it is. Doug Odom in big ditch
Nafzger wrote:
>
> List,
> I was given a 6 cyl GMC engine from a 1957 school bus yesterday. It's
> complete except for the air cleaner, water pump, and generator. The guy said
> it was running well when he took it out and scrapped the bus a couple of
> months ago.
> How do I find out what I have? It's probably a 270 but could be a 302 or
> something else.
> Thanks,
> Howard Nafzger
>
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