Hot rod got 320 HP out of a dead stock 340, and 352 HP replacing the manifolds with headers.
"On factory claims of 275 horsepower at 5,500 rpm and 340 lb-ft (3,200 rpm), we got 320 horsepower at 5,500 rpm and 368 lb-ft at 3,500 rpm. So it's clear Mopar understated the facts by 45 horsepower and...