75gmck25
Full Access Member
- Joined
- Oct 13, 2016
- Posts
- 2,260
- Reaction score
- 2,200
- Location
- Northern Virginia
- First Name
- Bruce
- Truck Year
- 1975
- Truck Model
- K25 Camper Special TH350 NP203
- Engine Size
- 5.7
My '75 K25 has a 350 with aluminum heads, 213/[email protected] retrofit roller cam, Edelbrock Performer intake, and a Quadrajet that has been tuned to run a little better with the cam. I have stock 31" height tires, 4.10 gears, and my NP203 is still full time 4WD. RPM is about 2800-3000 at 60 MPH.
On a recent 220 mile highway trip I checked the mileage carefully and found I get about 10.6 MPG when driving about 55-65 on the highway. Engine is smooth running and has good power, but it will never get good gas mileage.
On a recent 220 mile highway trip I checked the mileage carefully and found I get about 10.6 MPG when driving about 55-65 on the highway. Engine is smooth running and has good power, but it will never get good gas mileage.