Hello all I am new to the site and also jet boats. I just recently bought a 79 20ft saber jet with a 460 in it and a berkely pump. The motor I was told had just been rebuilt... 3 trips on the water the bottom end went out cause the motor builder forgot to put the plugs in down in the lifter valley for the oil crossover... Oops. But I decided to build the motor because of this. I'm going to put SCJ heads on at 72cc roller rockers solid roller cam rpm air gap intake and forged pistons. I have an 800 cfm holley to fuel it. I'm looking to hit around 10.5\1compression. Best I have come up with is that I should be around 550 hp with this set up. I was wondering if anyone knew if my thoughts were correct about horsepower? And also if there is a possibility that I would have to do anything mg to my Berkeley 12 jf pump to make it handle that power? Any info helps!