If all full pressure 235 and 261 engines use the same crankshaft, why are there (4) part numbers?
Paul
There are not (4) part numbers.
3701486 is the part number for casting/forging number 3701488.
3770327 is the casting/forging number, part number 3770326.
This was a new crank in 1960 for the 261 engine.
Although it is identical to 3701488,
except it has a 7/16 x 20 tapped hole, 1 1/4 deep
in the front end of the crankshaft.
These special cranks were only used for the
crankshaft mounted power-take-off.
It provided additional support to the press fit
of the harmonic balancer to the crankshaft,
using a bolt and washer.
