I have a pair in my 95 32 skater. They have about 140 hours currently and have never been apart, they still have the seals on the intake bolts and do not use oil. The blowers are oil/gearlube in the front and packed bearings in the rear. This can contribute to longevity, if it uses lube, and the bearings need to be repacked, recommended at about 150 hours. The cam is very conservative, hyd flat tappet with total lift of 559 both intake and exhaust. As stated they are 4.5" bore x 4.5" stroke. Due to the long stroke the rpm must remain about 5000 for them to stay together. I am very happy with mine. The boat will run 100mph at 4000rpm and 120,s at 5200. I do not need to run mine hard, not to many on the Cheasapeake that can keep up. A nice set up, just a little windy.

I believe they are hydraulic lifter; 240 degree intake and exhaust, with .560 lift. They were the same as the 600sc's? Crane produced them. They have asymmetrical lobes, easy on the valve train and should last 500 hrs. I had them in a Top Gun and they do sound good.:D

Ok, sounds like a good package, now all I need to do is get approved for the loan. That seems to be a challenge, even though I can afford it.