I found out the unidentifiable monster engine in my 51' GMC 640 is a ...F**d :mad: 534 c.i. Super Duty. 1100 lbs. of crap. And I thought it was the ferret under the seat that smelled. I see heart transplant in it's future 
'36 Tall cab Chevy 1.5 ton, '36 Low cab Chevy 1.5 ton, '53 GMC 2 ton, '51 GMC 640 5 ton, '47 Dodge 2 ton, '42 GMC CCKW 353 6X6.
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