For those unfamiliar with Detroits, the series (51, 53, 71, 92, 110, 149) represent cubic inches per cylinder. The number in front designates number of cylinders 2-71, 3-71, 4-71... and V engines are labeled as 6V71, 8V71, 12V71....
to find total cubic inches multiply the two numbers.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-