250/700r4 combo?

[lasher78]

I have the hardest time finding stuff here using the search so......could someone post a link to any existing threads that are discussing putting in a 250 and using a 700r4 behind it. hopefully with lots of pics. would greatly appriecate it. ads i am thinking of pulling out my 350/th350 combo and going to this. any thoughts and links helpfull. thanks in advance.

[NEWFISHER]

Check my 50 Burb thread in my sig.
If you have any questions let me know. Its a great combo!

[Clyde65]

Good one here

http://67-72chevytrucks.com/vboard/s...d.php?t=607113

[NEWFISHER]

Double post please delete

[lasher78]

Ok since mine already has a v8 in it is switching to a 250/700r4 going to be a complicated pain in butt or a simple swap. or should i just find a smaller v8 and put it in if rhat would be sier.

[NEWFISHER]

Just need to fabricate engine mounts or get some used ones.

[65Gregg]

I have got to ask a question, why? I personally would keep the 350 and put the 700 in. Is the 350 bad? What gear does your diff have? Ok that's 3 questions. I have a 350/700 combo and probably wouldn't trade it for anything except 5 speed.

[lasher78]

1. 3.73
2. Dont know if 350 is bad has not ran in 16 yrs that i know of.
3. Not wanting to hot rod just good everyday driver with decent gas milage.

[NEWFISHER]

3:73 , 700r4, 29" tire, 250 with cam and internals a Holley 390, clifford intake, cast headers and 2 1/2 exhaust makes 19 mpg.

[kieth]

Originally Posted by NEWFISHER

3:73 , 700r4, 29" tire, 250 with cam and internals a Holley 390, clifford intake, cast headers and 2 1/2 exhaust makes 19 mpg.

Too bad we do not have dyno information on your truck. When we look at our torque spreadsheet it seems your truck in its basic 250 155hp is a little weak kneed in stock form (419ft lbs of torque) with the tall rubber. If we think your mods have made your 250 perform more like a 292 then you do have an acceptable amount of torque (491 ft lbs). So the combination of the mods with a 4 barrell carb and you keeping your foot out of the back 2 barrells make your truck get good fuel mileage.....Torque within a usable range of speeds makes for a good combination. mph @ 2000 rpm 66mph great set up. Kieth


ps We use 460 ft/lbs as a general guide for acceptable performance because we know it works in my 350 TBI, 700r4, 3:73, 30"diameter rear tires..