CK5
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6.2 or 6.5 diesel versus 350 V8Tbi. Out of which diesel engine is better than the 350?
- Thread starter blackandgold51
- Start date
I just got 16.8 mpg on my last trip to the city, most of which was either 60-65 mph or slow crawl in traffic. No overdrive 3.73 gears with an sm465 in an 84 k20 on 33s with 4 inch lift. I bet if I had overdrive I'd be getting 20.. Easy..
Oh and 300k miles. Best square I've ever owned.. Slow but gets the job done and great for running around.
We're gonna need to see some pictures...
I have A '90 K5 6.2 that I bought in 1994 with 49k on the clock. 3.73 gears, 700r4, and all stock besides for a set of 32" mud tires. It consistently got high-teens to low-20's mpg with a teenager behind the wheel and the throttle pedal always touching the floor. It made several long trips on the freeway during those years running 70-80 mph (and I have a couple speeding tickets to prove it). After getting out of college I leased a '98 Toyota Tacoma regular cab/short bed, 5 speed, 4 banger to drive everyday and it got worse mileage than the K5 did.
Power-wise I thought it was decent. Growing up I spent a lot of time driving late-70's through early-90's trucks working on the local farms and for a construction company. I regular drove a mid-80's F-350 with a 460/4 speed combo when working construction and will say that the seat of the pants performance when empty wasn't much different. I also believe the later model 6.2's had more power than the earlier versions........early versions show around 130 HP/240 TQ but go up to 160/285 in factory applications later in production. Granted not super impressive numbers but that is a 20+% power increase. Ironically I met the previous owner of my Blazer around 2012 (18 years after buying it from a dealership) and he remembered being impressed with the power of it back in the days and compared to the 6.2 rumor mills of being a complete dog. I've since added a single plane J-code intake and turned up the pump some, and kinda' wish I could see how it would run compared to being stock. The 1-ton axles and 40" tires make it hard to compare.
I have about 130k on the 6.2 now and it has been used hard since I have owned it, including being a trail only rig that gets beat on and put away wet for the last 10 years. Never have done anything internal to the engine or had issues with the harmonic dampener. A couple of starters and alternators (probably due to mud) and replaced the glow plugs and controller once. Always starts with no problems if the batteries are good.
Power-wise I thought it was decent. Growing up I spent a lot of time driving late-70's through early-90's trucks working on the local farms and for a construction company. I regular drove a mid-80's F-350 with a 460/4 speed combo when working construction and will say that the seat of the pants performance when empty wasn't much different. I also believe the later model 6.2's had more power than the earlier versions........early versions show around 130 HP/240 TQ but go up to 160/285 in factory applications later in production. Granted not super impressive numbers but that is a 20+% power increase. Ironically I met the previous owner of my Blazer around 2012 (18 years after buying it from a dealership) and he remembered being impressed with the power of it back in the days and compared to the 6.2 rumor mills of being a complete dog. I've since added a single plane J-code intake and turned up the pump some, and kinda' wish I could see how it would run compared to being stock. The 1-ton axles and 40" tires make it hard to compare.
I have about 130k on the 6.2 now and it has been used hard since I have owned it, including being a trail only rig that gets beat on and put away wet for the last 10 years. Never have done anything internal to the engine or had issues with the harmonic dampener. A couple of starters and alternators (probably due to mud) and replaced the glow plugs and controller once. Always starts with no problems if the batteries are good.
