i dont know exact numbers, but i do know a 305 has a lot less balls than a 350 but gets the same fuel mileage so it wouldnt be worth it! wait for the 350. granted, you could modify it but (unless its a super deal or something special) i would suggest holding out for the 350 most people will tell you the same also
"I've got a shotgun, a rifle, and a four-wheel-drive and a country boy can survive!"
The 350 outperforms the 305 in both torque and hp, while getting about the same milage. How long any of them last is more up to regular oilchanges than cubic inches[img]/wwwthreads_images/icons/wink.gif[/img]
In stock form the 305 has about 20hp & 25 ft.lbs less than the 350. If thatīs a whole lot is up to you to decide.
Like pretty much everyone else here, I can't quote any numbers... But when I did the 305->350 swap in my '84 Jimmy, I actually gained about 3mpg and the vehicle actually became highway-driveable. I can't speak for the newer EFI beasties, but on the carbed engine, the difference was night and day.
I think that the 305 and 350 have the exact same block. Bore size and all. The only thing that is diferent is the crank.
Bore specs for 305 & 350 3.7350-3.7385
95 and earlier-3.9995-4.0025
95 and later 4.0007-4.0017
Those are specs from my Haynes service manual
I havent found the specs for the crank or the stroke I think these are the only difrences. Ill keep looking and maybe post them sometime if I found them.
Nope the bore is exactly the same You could pull the pistons from a 305 and put them in a 350. Thats I know is the same I think the 305 has a shorter stroke. This would cuse it to lose the power on the bottom but would cause it to rev quiker making more power on top.
Thats why everyone prefers the 350 over the 305 in their 4bys they use the power on the bottom not the top end.
In my opion they are both good motors just depends on what you want.