Assuming good oil and care, about how many hours could you expect a 496 425 h.p. engine to last if most of the hours were in the 3000-4000 r.p.m. range? Let's say a 35' stepped hull with twin engines and Bravo drives...

I have a friend who has a 2002 Nordic Heat with the 496 mag ho 425hp....So far he has 850 hours and the motor runs like a top! Its all original too--nothing has been done to it.

800-1200 or maybe even more.

i agree,the 496 in stock configuration is a dependable engine,but not one i would ever conceder supercharging.

I agree, at least 1000 hours.

LUVLY , 850 HOURS TO GO THEN

Lost 2 intake valves and 2 exhaust valves

Luck of the draw I'm guessing, mine was either a monday or friday motor. always ran synthetic 20W-50 oil, wix oil filter, change oil every 20-30 hrs. always had good oil pressure, motor never got over heated..

Did the valve springs fail first?