The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - What kind of gas mileage do you get with your 67-72?

**Steeveedee** · 02-08-2021, 08:42 PM

OK, either you have too-strong springs on the advance weights, or the weights are stopping at the limits. The limits and/or weights can be modified. Is it an HEI? The VAC isn't that hard to remove and replace. Is it one of those electronic ignition distributors that look like stock?

02-08-2021, 08:42 PM	#120
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,131	Re: What kind of gas mileage do you get with your 67-72? OK, either you have too-strong springs on the advance weights, or the weights are stopping at the limits. The limits and/or weights can be modified. Is it an HEI? The VAC isn't that hard to remove and replace. Is it one of those electronic ignition distributors that look like stock? __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA