ok I am looking for advice on my rebuild .
Stock hp 500efi with a procharger stage 3 , running hours unknown . It runs well but burns oil , 1 qt per hour when running hard . The fuel system was modified , but otherwise stock. What would you do on a complete rebuild and what hp could I expect without giving up reliability .Thanks for the help in advance . The motor is currently in a local builders shop (MRD on long Island)and I am relying on his expertise but I want to hear other opinions , thanks again

Jim

Don't be suprised if the oil consumption is only marginally better after the rebuild.
Wider lobe separation angles (114-115 degrees) with duration around 230/236 intake and exhaust, keep valve lift down to something reasonable (.510 -.540) for maximum valve spring life (Comp Cams). Retain the stock heads, stock ignition and stock oiling system (stock oil pan). Lower the compression with flat top pistons but keep the quench tight. Champion RV15YC4 spark plugs gapped at .045 inches.
Good Luck
Sincerely
Dennis Moore
FAMILY AND PERFORMANCE BOATING MAGAZINE

Hi Jim,

It is never easy to make these decisions when rebuilding a motor. Take your time to weigh out many options before committing yourself. Since you have the motor apart, don't rebuild it to Merc. specs. Being that the motor is ProCharged built it accordingly. As Dennis said, go for higher duration camshafts and keep the lift low. Blowers work better with more duration while lift is not as critical. Your valve springs will thank you. I feel the biggest problem you will have is getting the E.C.U. re-mapped correctly.

Hey Vin ,
Yea its difficult , so many differing opinions , we all want that hp but dont want to give up reliability , I have been told that there are a few good places to get ecu remapped and new sensors that read not just vacuum required in naturally asperated motors but also boost , anybody have experience with them? Hope to see you in a few months , dam i hate the winter !

Hey Dennis,
Thanks for the response , 1 quart an hour isnt that bad ? Dam Thats why I tore it apart ! Actually I had no real idea of how many hours were on the motor and I really want the safety of knowing whats inside , but I thought the oil consumption was a serious concern. I do a lot of long distance trips and reliability is a great concern .You think the stock ignition is sufficient with the procharger ? I do have black transom syndrome and was told that msd was a must for blown setups , the truth is though it was running pretty strong but I was only running mid 80s and it ran 78 to 80 without procharger . I know not to believe prochargers claims of 20 mph gains but what is an honest mph gain with a stock setup with procharger added? What do you think a realistic hp will be with the motor set up for boost ? what do you think a stage 3 pro charger gains with stock hp500 ?
thanks for the help

jim

5 psi max boost right now . Is it safe to go any higher ? and at what gains ? I know there must be alot of you out there with hp500 efi with prochargers , id like to hear real numbers !
thanks