502 gen 5 question
+ Reply to Thread
Results 1 to 10 of 10

Thread:
502 gen 5 question

  1. #1
    Renegade jet tunneljet's Avatar
    Join Date
    Apr 2008
    Location
    Shorewood Il
    Posts
    472

    Default 502 gen 5 question

    I found a nice 502 gen 5 for sale for $4500, what are the differences in this block from a gen 4 bbc. Will oil pan, intake manifold, etc. interchange? It has a set of gen 4 781 heads on it, will these work on this motor? or should I run away. Thanks for the help.

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Boat Nut sleekcrafter's Avatar
    Join Date
    Dec 2007
    Location
    South Elgin, Il.
    Posts
    5,131

    Default

    oil pan, timing cover, and crankshaft are different. everything else is bolt on.
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


  4. #3
    21 Daytona Outlaw's Avatar
    Join Date
    Dec 2007
    Location
    Artesia, N.M.
    Posts
    5,291

    Default

    I thought you could NOT run mark 4 heads on a gen 5, isn't that why they went to gen 6?
    #55

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member Boat 405's Avatar
    Join Date
    Dec 2007
    Location
    San Diego, CA
    Posts
    3,736

    Default

    gen v is kind of the red headed step child of the bunch. I'd keep looking. there is a nice 454 gen vi in the spam section intake, headers, oil pan, ignition and berk pump for $3500.

    the gen 5 blocks are special in the case that the water holes don't match up with other mark iv and gen vi heads. Special gaskets are required to ensure water leakage does not occur.
    Boat 405.

  7. #5
    Senior Member
    Join Date
    Jul 2008
    Location
    Kingman/Golden Vly, Az
    Posts
    1,278

    Default

    Quote Originally Posted by widowmaker View Post
    I'd keep looking. there is a nice 454 gen vi in the spam section intake, headers, oil pan, ignition and berk pump for $3500.
    x2...there are several nice engines for sale in the Spam Section for reasonable prices...just do a search

    FastRat

  8. #6
    Senior Member Futs's Avatar
    Join Date
    Dec 2007
    Location
    Orange CA, Big River
    Posts
    4,549

    Default

    i ran protopline aftermarket heads on my gen 5 with the right head gaskets, boats still running strong 5 seasons later without issue last i heard. it can be done, but like others said, look around.

  9. #7
    Renegade jet tunneljet's Avatar
    Join Date
    Apr 2008
    Location
    Shorewood Il
    Posts
    472

    Default

    There are some nice engines in the spam section, but they are all on the left coast. This one is close to my house, but I don't want to buy a bunch of new stuff to make it work.

  10. #8
    Senior Member Josh@JBP's Avatar
    Join Date
    Mar 2008
    Location
    California
    Posts
    388

    Default

    Most aftermarket heads and some Mark IV heads have enough material to seal and will fit. As to which ones I can't say, I've been told each installation needs to be checked for proper sealing. Most head gaskets now should fit all blocks and heads mentioned above in regards to sealing. Also Gen v and Gen vi heads are essentially the same, so gen vi heads are a direct bolt on. The gen vi block was revise to not have this issue along with a few other revisions.

    I don't know if this has been mentioned yet but the gen v production block doesn't allow for a mechanical fuel. And they're all 4 bolt mains.

  11. #9
    Senior Member high flyer's Avatar
    Join Date
    Jan 2008
    Location
    Elsinore CA / 6 Ave
    Posts
    257

    Default gen 6 the way to go

    just so happens I have one carb to pan msd 850 dp 10 qt dooley came out of my placecraft and was gonna save it for a cruizer but bought a pontoon so no need 4 it iron head motor very low time built by boostpower marine in 99. simple drop it in let her rip aprox 490 horse 540 tq je pistons 8.875 cr very low key pump gas deal lookin for 5k obo pm if interested john

  12. #10
    Senior Member n8dawg's Avatar
    Join Date
    Jan 2008
    Location
    Santa Paula
    Posts
    1,185

    Default

    Quote Originally Posted by Futs View Post
    i ran protopline aftermarket heads on my gen 5 with the right head gaskets, boats still running strong 5 seasons later without issue last i heard. it can be done, but like others said, look around.

    Good to know for my Gen V.
    thnx!!

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95