496ci are 375 or 425 / 365 or 385 would be 454ci

I have read this post many times and have check my paper work on my boat which is a 2000/ 271 was a 502-415hp it came with a 26p left hand prop it top out at 63.7 gps @5100 when it got lab I hit 65 gps hope this helps . good luck to all !

left hand prop? I would be completely happy with them numbers but I wonder how much of that is due to the newer Fastech hull??

I have a stock B1 with a labbed (some cup) 24P, behind a stock 496HO (425 hp). With one person on board, 1/2 tank fuel in light chop at 4600 WOT, I get 62 mph (non GPS).