The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - MPG on 307? Pretty sure I have to buy this truck.

72JimmyDiesel · 08-18-2009, 12:51 AM

I have a 72 SWB 307, 4spd 3.08 truck. With the 307 it would get 14-15 mpg. It ran poor and the timing chain was about to fall off. I did a fresh up on the engine and stuck it in a 47 cj2a. With 5.38's it would get 12mpg. the 307 was replaced with a 6.2l diesel. I average 20mpg now.

08-18-2009, 12:51 AM	#10
72JimmyDiesel Registered User Join Date: Oct 2008 Location: Newberg OR Posts: 14	Re: MPG on 307? Pretty sure I have to buy this truck. I have a 72 SWB 307, 4spd 3.08 truck. With the 307 it would get 14-15 mpg. It ran poor and the timing chain was about to fall off. I did a fresh up on the engine and stuck it in a 47 cj2a. With 5.38's it would get 12mpg. the 307 was replaced with a 6.2l diesel. I average 20mpg now.