The 261 is pretty much identical to the 235 except is bores are cast bigger and
it has beefier rods. Later ones, 57 and on (I think) have a full flo oil
filtration system evidenced by the big oil lines. Many, but not all, can
recognized by the cast Captains Bars that look like Roman numeral 2. I have seen
a 235 with this symbol so its best to check the casting # to be sure. Casting
#'s are at the Inliner site.
Most parts I can think of interchange. There are pipe thread holes for a
filter, they must have plugs in them. Make sure that if the engine is a 261 and
they are the large type for a full flo filter you run the proper 261 filter and
lines or you will cut off oil supply to the bearings. Of course if it was run
like that it is probably toasted already. Yes, a short shaft pump will work on a
261.
Grant
50 Chevy 3100
52 GMC 150
james salley wrote:
> How do you tell if you have a 235 or a 261? The PO replaced the engine in
> my 54 3100. The motor does not have a oil filter or fittings for a external
> oil filter. What is the difference between the 235 & 261? Will any parts
> interchange? The truck did not have a radiator in it when I got it. When I
> tried to put a new radiator in the fan stuck out to far. Will the short
> shaft water pump for the 235 fit if it is a 261?
>
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