New CM870 long block

[Hemiterry]

Thanks for all the advice, I never thought about the muffler being a problem, I’ll look into that immediately. Today I hauled ten very heavy loads and the truck smoked less and ran stronger as the day went on. I feel like it’s just now getting into initial break-in. I’m running in southwest CO at average elevation of 6500-8000 feet so I have plenty of steep hills to really wind it up on !
Thanks everyone !