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Where can I find instructions on how to adjust a new heat riser that I am putting in my 4-134 L engine?

Thanks for the info. I am going with 49 for now but I am still going to look for some serial numbers. The truck is under 4 ft. of snow right now so it will be a while.

Truck 1946 to 50? 4-134 L head Motor (just got it started. Runs like a charm)1946-50.
Split windshield. V shaped grill.This indicates 1950-64.
Motor not like on page 241 (parts catalog 2014)....