261 Jobmaster engine id - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Maynard57 · 03-17-2014, 04:17 PM

Trying to confirm what motor I have:

PO says its a '54 261.
Head has four side screws holding valve cover in place (not 2 on top like earlier 235), front breather cap a Fenton dual exhaust manifold.

Block casting number, right side, aft of fuel pump is:
3759365

Stamped number on flat machined block boss, near front of starter is:
F3I7L

Inline website says block casting is 1959 2 ton truck 261 motor.

Can anyone confirm 261 and year?
What is the F3I7L number (engine serial number?)
How can I id head (235 vs 261)?

Thanks, Maynard

03-17-2014, 04:17 PM	#1
Maynard57 Registered User Join Date: Jan 2014 Location: Foresthill CA Posts: 8	261 Jobmaster engine id Trying to confirm what motor I have: PO says its a '54 261. Head has four side screws holding valve cover in place (not 2 on top like earlier 235), front breather cap a Fenton dual exhaust manifold. Block casting number, right side, aft of fuel pump is: 3759365 Stamped number on flat machined block boss, near front of starter is: F3I7L Inline website says block casting is 1959 2 ton truck 261 motor. Can anyone confirm 261 and year? What is the F3I7L number (engine serial number?) How can I id head (235 vs 261)? Thanks, Maynard



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