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305 to 350 swap on 85 GMC Jimmy, Carb help

8 messages,  Last post on Jun 06, 2008 at 11:37 AM

You are in the Speed Shop Tuning and Modification Forum.

What is this discussion about? GMC Jimmy, Chevrolet Blazer, Fuel System, SUV

Messages Page 2 of 2

#5 of 8 Re: fuel economy [1986blazer] by okko1

Mar 07, 2008 (7:26 pm)

Replying to: 1986blazer (Mar 05, 2008 10:26 pm)
do you have an auto or manual trans. 373 with 4 speed auto is not bad. the problem is you have to make front to rear gear changes. the cost minus the assumed savings may justify leaving it alone.

#6 of 8 Re: fuel economy [okko1] by paisan

Mar 07, 2008 (8:33 pm)

Replying to: okko1 (Mar 07, 2008 7:26 pm)
Do you need a truck? I'd look for a more economical car in terms of gas if you don't absolutely need the truck.
 
-mike

#7 of 8 ignition timimg by ahinson

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] by burdawg

Jun 06, 2008 (11:37 am)

Replying to: 1986blazer (Mar 05, 2008 10:26 pm)
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.

Messages Page 2 of 2

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