Don't know much about a Chevy 305.

[Darkman]

Just like it says I don't know much about Chevy 305 motors, what would the Got Mud crowd recomend I do with it? Its an '86 Carborated with unknown milage Haven't heard  it run yet but have been assured that it does, just needs a battery and some good gas. I'm looking to make it so it will turn 35's comfortably, My buddy Ralph has an '87 K5 Blazer with the same motor running 6" of lift and 35's and it just doesn't seem to have enough poop to throw chunks. Any advice would be helpful, thanks.

[7387chevynut]

IF it runs good.........then I'd use it..........you can compensate a high mileage low horse power motor by running a lower axle ratio and that can make up for lack of horse power to spin tires.

You didnt say what axle ratio your buddy has in his 87 K5..........but either 3.73 or 4.10 should be enough to spin those 35's easily.

[Mudbuster]

IF it runs good.........then I'd use it..........you can compensate a high mileage low horse power motor by running a lower axle ratio and that can make up for lack of horse power to spin tires.

You didnt say what axle ratio your buddy has in his 87 K5..........but either 3.73 or 4.10 should be enough to spin those 35's easily.

I agree I'd regear if needed and run it till it dies, while your beating the out of it find a 350 to put in it.

[Orangecrush]

well regearing can get costly too, dont know what your budget is but I would look for at least a 350.
305's just arent very good in the power department.

[Kodiak450r]

cost effectively it's better to build a very mild 350 versus building up significantly a 305. although there are a few guys who have gone out and made 375 horse and 400+ ft-lbs with a stock block 305 with alot of head and cam work.

[Econo-box from Hell]

I've run a bone stock 305 in my Metro turning 54 inch tires with good results.  I use a stick transmission with a 6.44 first gear, a 205 t-case with a 1.96 gear and Rockwell axles with 6.72 gears.  The whol rig weighs around 6000 pounds. 

If you are on a budget run the 305 with some smaller tires.  After you have been playing in the mud for a bit start saving up for a 350 and some bigger tires.

[Bo Duke]

I'd just run the 305 and build a 350..

[BadF-150]

my buddy has a 305 in his 92 k1500 backed with a 5spd and on 33's and that thing slings mud with ease and tows with the best of them we've had it loaded down with probably 5 tons of scrap and it pulled it good for a half ton

[RIP_K52007]

i got a 305 in my 85 blazer with 38.5's when it moved it went pretty good... tranny didnt hold tho lol

[RIP_K52007]

4got to mention... it has 4.56 gears so that helps definetly

[Darkman]

Thanks, I'm going to run it for as long as I can for now with some light bolt on motor work such as headers, exhaust, and some quality tune up parts. Probably gonna throw on some chrome accessories just for decoration. Thinking about either a set of 33"x12.5 mud terrains or 34"x10.5 Swamper LTB's but haven't made my choice. I don't know what the stock gears are for an '86 1/2 ton Scottsdale but I figure it should spin a 34" tire just fine.


What should I be looking for in a moderately priced 350, I don't know much about those either? I might have a lead on a a GM Goodrich 327 out of a '79 two wheel drive Scottsdale is this something I should even consider?

Thanks for your help guys.