When To Rebuild
 

Restoring 1979 Donzi It Has A 454 420hp Motor With Under 450 Hrs Of Fresh Water Use Runs Like A Top Comp Is Good No Smoking Or Blow By What Is The Life Before It Needs To Be Rebuildt

I had 454 they run forever

I know guy that had over 950 hours on his pair and they looked like new when he took them out, only because he thought it was time for a rebuild.

Couldnt beleive how good they looked and what the overall great condition they still were in, but he took great care of them too during their life.

800-1200 hrs

What Would Need To Be Done To Motor To Run Blower

What kind of drive are you running? Can it handle the torque?

Trs

For me it's usually when it goes rattle, rattle, bang, bang. :eek:

If properly maintained, those motors in their current state will last at least 1000 hours. I supercharged a set of similar motors on my last boat at 450 hours. I sold the boat with 590hours and it was still running strong. I ran B&M 250 blowers with 3-4 pounds of boost. The larger blower with low boost allowed the engines to live as this combination limited intake heat, which ultimatly kills engines by detonation. I recommend the B&M 250, 671 or 871 blower pushing 3 pounds of boost for these engines.

do i need to change anything in motor to run a blower
internals?
what would be the advantage and disadvantages how much more hp will i see
boat currently runs in the high 60s