[sst3447]

I have had both 6.2 and 6.5 in my tow vehicals put injector pumps on both cylinder heads on the 6.5 , they both are underpowered and if you tow a large trailer you will have overheating problems my 6.5 would run about 240 degrees towing my gooseneck i would stay away . my duramax will pull with no problems