piston questions

Hyper pistons are fine for towing. The 360 mags were DESIGNED as long runner short cammed truck engines from the factory with those pistons. They’ll be fine. I run hypers on a turbocharged 8.1 in my GM dually and it’s got over 630,000 miles on it, towing its entire life ON BOOST!! Ring gap and skirt clearance are important.

@volaredon I think you should build it stock, the 360 magnums stock are great truck engines. Step up one cam size or so (like 208 @ 050) and send it. Your 87 octane requirement keeps you in the stock long block territory. Use the longest runner dual plane intake you can find (rpm ag) and whatever carb you’re comfortable tuning. And my final thought, BALANCE EVERY ENGINE YOU ASSEMBLE. It’s a non negotiable part of engine building.