HOW MUCH POWER DID THE L78 375HP 396 REALLY MAKE? WAS THE 1965 L78 425HP 396 CORVETTE OVERRATED? WAS THE 375HP L78 396 CAMARO OR CHEVELLE UNDERRATED? HOW MUCH POWER DID CHEVY'S LITTLE BIG BLOCK REALLY MAKE? AFTER FINDING LEAKING HEADS IN PART 1, WE REPLACED THE HEADS FOR A SECOND TEST. I INSTALLED NEW 858 HEADS IN PART 2, ALONG WITH AN ELGIN REPRODUCTION FACTORY L78 CAM AND STOCK ROCKERS. I RAN THE 396 BOTH WITH LONG TUBE HEADERS AND STOCK, CASTIRON BBC EXHAUST MANIFOLDS. CHECK OUT THE POWER DIFFERENCE THAT HEADERS MADE ON THE BBC. FINALLY WE HAVE DYNO RESULTS ON THE L78 396!