Last post on Jun 06, 2008 at 11:37 AM
You are in the Speed Shop Tuning and Modification
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GMC Jimmy, Chevrolet Blazer, Fuel System, SUV
#7 of 8 ignition timimg
May 31, 2008 (6:19 am)
what is the timing for 86 chevrolet 350,ie 2,4,6,8,DEGREES .the sticker is gone on the radiator support that usually tells you. thanks.
#8 of 8 Re: fuel economy [1986blazer]
Jun 06, 2008 (11:37 am)
Changing the gear ratios from 3.73 won't be much help. That is already a very good compromise between economy and effeciency. 3.42 was higher ratio for those years, not sure if it was available on a Blazer though. I had an 85 Suburban with 3.42, it was OK on fuel mileage (well, for a carbureted Suburban anyway), but absolutely was terrible at towing anything other than a light load.
The best modification you can do is to your driving habits. Slow down, try to stay in higher gears, leave it parked more often.