502 Build Help
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502 Build Help

  1. #1
    AAARRRRRGGGGGGG!!!!! Motomatt68's Avatar
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    Default 502 Build Help

    I have a 502 that has some piston damage from detonation. When I got the boat I believe that there must have been some bad gas in there and it killed two pistons. I showed the damage to an engine builder and he said that I could replace all eight pistons and it will be good. The engine was rebuild less than 20 hours ago and it shows no signs of wear on the cylinder walls or anywhere else. The very edges of the two pistons were cracked and that is all of the damaged that could be found. It is a gen VI with rectangle port iron heads.

    I am planning on reassembling it my self. What I need help with is deciding on what to do. I figure that now is the time to change the cam and what ever else I can do for not too much money. I want a motor that can idle and gets decent mileage and runs on pump gas. I also want a motor that has 550+ torque and 550+hp. I think this is realistic with the motor that I am starting with.

    What I want are ideas. I also would like to find an engine builder that will work with me and give me advice. I am going to do the work but I want someone to ask questions.

    Matt.

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  3. #2
    Senior Member Boat 405's Avatar
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    plenty realistic. Which heads do you have on the engine?

    Is it a 502/502 or the base 450hp 502?
    Boat 405.

  4. #3
    AAARRRRRGGGGGGG!!!!! Motomatt68's Avatar
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    I have iron heads so it is not the 502/502. I looked it up in mike marvigian's bbc book and it refers to all of the components I have as the high performance style. Larger push rods. Larger head openinings. I dont remember all of it so I am not sure but my block casting number is G217 2 10237300 and the head casting number is 14097088 GM1. It has a roller cam and 118cc chambers.

    I have to mic the bores to see if it has been bored and to what. I believe that it has been gone through but that is from stuff I have seen on the outside. The cylinder walls and bearings look and feel brand-spankin'-new.

    I am going to Tahoe for the week tomorrow so I may not respond if I cant get internet access.

    Thanks, Matt.

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