The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1966-81 Chevy H/J Series

**Bob B.** · 02-17-2015, 05:14 AM

The 637 gas V-8 did show up in some Chevy 90 series trucks from '70 to '72. I remember that 'Diesel 90' badge on some Chevy J series trucks well into the 70's.

As far as engine codes go, 'S' was Chevy straight 6, 'M' was GMC V-6, 'G' was Toroflow V-6, 'E' was Chevy V-8 or 637, and 'J' was Toroflow V-8.

02-17-2015, 05:14 AM	#18
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,309	Re: 1966-81 Chevy H/J Series The 637 gas V-8 did show up in some Chevy 90 series trucks from '70 to '72. I remember that 'Diesel 90' badge on some Chevy J series trucks well into the 70's. As far as engine codes go, 'S' was Chevy straight 6, 'M' was GMC V-6, 'G' was Toroflow V-6, 'E' was Chevy V-8 or 637, and 'J' was Toroflow V-8. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.