The Optimizer is just an improved cast engine block. Different Metallurgy that makes it less prone to cracking than the early cast GM blocksHello,
I am having issues finding information on the towing capabilities of the 6.5 Optimizer. I currently have a 96 K2500 and a 10616# GVWR 5th wheel. My 6.5 diesel is finally done at 225,000 miles (intake valve is sticking, low oil pressure, uses a gallon of coolant a month, uses a quart of oil per tank of fuel, and the turbo is failing). I am looking at a complete Optimizer remanned engine to drop in as a replacement. I know that they are supposed to be better than what i have now- better block casting and better heads... But the question is what can a guy expect to be able to tow with one of these? I know that with my current setup, my 6.5 has all the power i need to tow a single car on a car trailer, but i have to keep one eye on my water gauge all the time. Have any of you towed heavy with an Optimizer? How did it go?