20 mpg or not? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*mrhino* · 03-12-2013, 07:32 PM

Within the week or so, the wife & I will be starting the engine build for the crew cab project we have going on. Over the weekend, It brought up a interesting debate with a few buddies that I trust and respect for their engine performance knowledge. My Goal with this engine is to get 20 MPG. A couple said it could be done and a couple said it wouldn't happen. Everyone made their points and theories. The debate and conversation was educational and interesting so I thought Id ask it here and see what some of the thoughts are.

The truck is a 88 1 ton crew.
4:11 rear
305/70/16 tires
700r4 trans

the engine will be a .30 over 5.7
58cc 187 swirl port heads with a mild port job.
20cc dished pistons
vortec Roller Cam 191º/196º 0.414"/.428" lift on a 111º LSA.
1 5/8 headers

so do you think it will get 20 MPG?

03-12-2013, 07:32 PM	#1
mrhino Account Suspended Join Date: Aug 2007 Location: USA Posts: 1,223	20 mpg or not? Within the week or so, the wife & I will be starting the engine build for the crew cab project we have going on. Over the weekend, It brought up a interesting debate with a few buddies that I trust and respect for their engine performance knowledge. My Goal with this engine is to get 20 MPG. A couple said it could be done and a couple said it wouldn't happen. Everyone made their points and theories. The debate and conversation was educational and interesting so I thought Id ask it here and see what some of the thoughts are. The truck is a 88 1 ton crew. 4:11 rear 305/70/16 tires 700r4 trans the engine will be a .30 over 5.7 58cc 187 swirl port heads with a mild port job. 20cc dished pistons vortec Roller Cam 191º/196º 0.414"/.428" lift on a 111º LSA. 1 5/8 headers so do you think it will get 20 MPG? Last edited by mrhino; 03-12-2013 at 08:31 PM.



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