azzman.. did you by the truck new or used because i'm trying to figure out why you are having so many problems with the engine.... This motor nt-16 is a tank and I have yet to develope a leak of any kind even after almost 5 gallons of 20% thru it.... I take off the head occasionally just to look inside and have never developed a leak... are you sure everything is flat and nothings warped? The only turning issues I've ever had traced back to a bad carb spacer which cen promptly replaced (the whole carb) free of charge........ I keep trying to convince myself to replace the engine, but it works too well and I can't justify the money....