Trying to start the engine on a '56 GMC 1.5 ton after who knows how long. I thought I had a 270 I-6, however after looking up the block casting numbers it appears I have a '53 or '54 248. So guessing it's not the original engine to this truck, which is kind of a bummer. Still hoping to get 'er started up. I have spark and now I have re-installed the carburetor with new gaskets. I installed new gaskets in the Carter Ball & Ball carburetor, which came from Chrysler (still leaking fuel from accelerator pump linkage - darn). The engine backfires through the carb, so now I want to verify the timing.
So here's me question: what is the firing order for this engine? Thinking it would be cast into the intake or somewhere else but couldn't locate it. Hoping someone reading this can also comment on the engine/truck relationship as well. Is there a chance this engine was original to the truck? Still not sure what to even call this old girl. '56 GMC 250? I was told by the previous owner it is for sure a 1.5 ton, so who knows. Starting to think that it's a bit of a "Frankenstein", but hard to imagine a guy would swap the 270 out for a 248 and then put a Chrysler carb on it. But maybe it's what he had laying around.
A quick response would be appreciated as I wanted to drive it to dinner tonight! Just kidding...
