- Joined
- Aug 3, 2010
- Posts
- 30,298
- Reaction score
- 27,899
- Location
- Usually not in Ohio
- First Name
- Andy
- Truck Year
- '77, '78, '79, '84, '88
- Truck Model
- K5 thru K30
- Engine Size
- 350-454
The original 305 in my '84 DD runs fine and averages 16 mpg. It has around 130K on it and it uses some oil, but nothing excessive. I'll say the power is just "OK".
I can get a good running, non-oil-burning '99 4.8 for free. It also runs well but it has an internal noise that doesn't seem to be getting any worse. It doesn't sound like a rod knock, but it doesn't sound like a valve tick either. Not sure what might be causing it.
Would I just be wasting time and money replacing my 305 with this 4.8 motor? I know I would need the right headers, mounts, fuel system, etc but that would be the case with any LS swap. I'm more concerned with an increase in power and mileage, if both are significant then I think it might be worth dropping in the little 4.8 motor.
I can get a good running, non-oil-burning '99 4.8 for free. It also runs well but it has an internal noise that doesn't seem to be getting any worse. It doesn't sound like a rod knock, but it doesn't sound like a valve tick either. Not sure what might be causing it.
Would I just be wasting time and money replacing my 305 with this 4.8 motor? I know I would need the right headers, mounts, fuel system, etc but that would be the case with any LS swap. I'm more concerned with an increase in power and mileage, if both are significant then I think it might be worth dropping in the little 4.8 motor.