First Dyno Tests On New 421sbc Dyno Mule: Big Headers Big Power

I show the new 421 small block Chevy Dino mule. I show Dyno results comparing small headers with large headers.  Link to donate to Dyno testing. https://weingartnerracing.braveshop.com/#!/Donations-For-Cam-Challenge-Dyno-Testing/p/503672395