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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Apr 2003 Posts: 942 'Bolter | | 'Bolter Joined: Apr 2003 Posts: 942 | I used to drive a 637 V-8 in a '71 9500. They are like the big 478 V-6 with 2 extra cylinders "welded" on. Same Cubic Inch per Cylinder. But, they are very different engines. They may look similar but where the 478 is a "lugger" with a lot of torque, the 637 is more of a "revver" like a Detroit. The 637 replaced the 702 in '66. I would have to check to be sure, but believe they were available till at least '72. Not my favorite engine ever made, but I still like them. Keep us posted if you buy it.
Bill
'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
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