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**Bob B.** · 12-09-2021, 02:36 AM

Floor and firewall of the 1973-1990 medium duty C series trucks are unique, not like 'Square Body' pickups. The floor under the seat is lower on the medium duty trucks, similar to the 67-72's. I don't think it's exactly the same, but a 67-72 carpet kit just might work with a little trimming. You will find the heater box is a lot different than same year pickups too.

You probably have a Detoit 'Fuel-Pincher' 8.2L in that. That's good and bad, they tended to blow head gaskets a lot if turbo'ed and pushed hard. Parts are getting a little tough to find and they are finicky to tune up (they have unit injection like a Detroit 2 stroke) but if it runs good they give great fuel economy.

Truck looks nice!

12-09-2021, 02:36 AM	#5
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,309	Re: 1988 C70 "Big Red" Fire Truck Toy Hauler Floor and firewall of the 1973-1990 medium duty C series trucks are unique, not like 'Square Body' pickups. The floor under the seat is lower on the medium duty trucks, similar to the 67-72's. I don't think it's exactly the same, but a 67-72 carpet kit just might work with a little trimming. You will find the heater box is a lot different than same year pickups too. You probably have a Detoit 'Fuel-Pincher' 8.2L in that. That's good and bad, they tended to blow head gaskets a lot if turbo'ed and pushed hard. Parts are getting a little tough to find and they are finicky to tune up (they have unit injection like a Detroit 2 stroke) but if it runs good they give great fuel economy. Truck looks nice! __________________ 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.