The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 4.3L Vortec Manifold Gasket Replace/Spider Upgrade

Mr Bear · 12-30-2016, 10:31 AM

I was surprised. At 150000 miles, the throttle body and the butterfly are still so precise in fit that the slightest misalignment could make such a difference. About two weeks of driving since the final fixes and everything is fine. I'm quite pleased and my mileage is staying in the mid 19 mpg range. I got 21+ on one tank running mostly highway, 65 mph and under. Overall, I'm reasonably happy I did the job, even though it was about 2.5 days of steady work.

12-30-2016, 10:31 AM	#7
Mr Bear Registered User Join Date: Sep 2014 Location: All Over Posts: 54	Re: 4.3L Vortec Manifold Gasket Replace/Spider Upgrade I was surprised. At 150000 miles, the throttle body and the butterfly are still so precise in fit that the slightest misalignment could make such a difference. About two weeks of driving since the final fixes and everything is fine. I'm quite pleased and my mileage is staying in the mid 19 mpg range. I got 21+ on one tank running mostly highway, 65 mph and under. Overall, I'm reasonably happy I did the job, even though it was about 2.5 days of steady work. __________________ No fancy sayings here.