Swapping bad gen 5 for new gen 4 bbc
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Swapping bad gen 5 for new gen 4 bbc

  1. #1
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    Default Swapping bad gen 5 for new gen 4 bbc

    Hi Greg, it's funny seeing your name on here because a friend of mine who built jet pumps back in the early 90s has mentionted your name..

    I am relatively new to being a boat owner but am very mechanical inclined working most anything.

    I have a 96 Team Hawaiian 21st open bow with a 454 and dominator jet. I ran it last season, ended up with a hrdrolocked motor and now bent rod or ? I'm not sure. I got a new motor for it. It was in a Belair for about 5 miles then pulled. Basically new engine (full rebuild). I got it for a good price and have pulled the bad engine out of the boat and prepping to swap all parts over to the new motor. The bad motor I pulled is a gen V 454 and my new motor is a gen IV.

    I'm looking for any advice or heads up during this swap that I should be concerned with. I have a few concerns already that I will include.

    My Gen V motor I pulled has a flywheel and top mount starter bell housing with clamp mount straight to pump bearing housing. Can I use this same flywheel on the new GEN IV motor? I've read balancing issues and such between the two. I don't think a regular flexplate would work for my setup with the bell housing and top starter. What is the best avenue to proceed?

    I'm going to be running a tunnel ram on the new motor with dual carbs so should be putting out some power. I have all the stuff off my motor I pulled (Marine Power SportPac 454) to swap over (thru transom exaust, mounts, water lines etc.

    I really appreciate any insight you can provide.

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  3. #2
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    Default Gen 5 VS Mark 4

    Quote Originally Posted by RyeRye177 View Post
    Hi Greg, it's funny seeing your name on here because a friend of mine who built jet pumps back in the early 90s has mentionted your name..

    I am relatively new to being a boat owner but am very mechanical inclined working most anything.

    I have a 96 Team Hawaiian 21st open bow with a 454 and dominator jet. I ran it last season, ended up with a hrdrolocked motor and now bent rod or ? I'm not sure. I got a new motor for it. It was in a Belair for about 5 miles then pulled. Basically new engine (full rebuild). I got it for a good price and have pulled the bad engine out of the boat and prepping to swap all parts over to the new motor. The bad motor I pulled is a gen V 454 and my new motor is a gen IV.

    I'm looking for any advice or heads up during this swap that I should be concerned with. I have a few concerns already that I will include.

    My Gen V motor I pulled has a flywheel and top mount starter bell housing with clamp mount straight to pump bearing housing. Can I use this same flywheel on the new GEN IV motor? I've read balancing issues and such between the two. I don't think a regular flexplate would work for my setup with the bell housing and top starter. What is the best avenue to proceed?

    I'm going to be running a tunnel ram on the new motor with dual carbs so should be putting out some power. I have all the stuff off my motor I pulled (Marine Power SportPac 454) to swap over (thru transom exaust, mounts, water lines etc.

    I really appreciate any insight you can provide.
    The flywheel is not the same so your are going to have a different flywheel for the Mark 4. You already have an electric fuel pump for the Gen 5 so the fuel pump issue is resolved. Your oil pan is not the same so a new oil pan is in your future. Make sure that the oil pan is no deeper than 8 inches or it will not fit in your boat

  4. #3
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    Can I just get any flywheel for a Mark 4 and it will work with the top mount starter? Assuming it is same tooth and diameter..
    On the oil pan do you have a source to get a marine pan or could I just run the truck pan already on the motor? I appreciate your help.

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  6. #4
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    On another note, do you remember a Mike Rudar from Alpha Marine?

  7. #5
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    Default Flywheel

    Quote Originally Posted by RyeRye177 View Post
    Can I just get any flywheel for a Mark 4 and it will work with the top mount starter? Assuming it is same tooth and diameter..
    On the oil pan do you have a source to get a marine pan or could I just run the truck pan already on the motor? I appreciate your help.
    Is this a 330 hp 454 base or is it a 454 magnium 425 hp. Both take different flywheels. SFI approved flywheels are thicker and will work fine with a top mount starter.

  8. #6
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    Engine numbers
    Head) 353049
    Block) 10069286

    It is stamped high performance on the block and has a bigger cam. Not sure on size but was told it wasn't a crazy cam, but bigger than sock. Big oval ports, and large chambered heads.
    Not sure on the magnum part.

  9. #7
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    Default

    Quote Originally Posted by RyeRye177 View Post
    Engine numbers
    Head) 353049
    Block) 10069286

    It is stamped high performance on the block and has a bigger cam. Not sure on size but was told it wasn't a crazy cam, but bigger than sock. Big oval ports, and large chambered heads.
    Not sure on the magnum part.
    What flywheel is on the Mark 4 now?

  10. #8
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    A damaged flex plate. Supposedly it was balance with the engine, can't be sure though. I don't believe it will work with my top mount starter aND bell housing. I can get a flywheel but I'm concerned about engine balance. most info I find is that 454 blocks are external balance.how do I go about getting the correct one?

  11. #9
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    Default Flywheel

    Quote Originally Posted by RyeRye177 View Post
    A damaged flex plate. Supposedly it was balance with the engine, can't be sure though. I don't believe it will work with my top mount starter aND bell housing. I can get a flywheel but I'm concerned about engine balance. most info I find is that 454 blocks are external balance.how do I go about getting the correct one?
    The flexplate will work with a top mount starter, go to local parts house and match up the flywheel you have and tou should be good to go. On the counter weight is there any signs where weight has been added or taken away?

  12. #10
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    I can use your oil pan off the gen 5 if it is for sale. Call 760 288 6906 Dave is my name

  13. #11
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    Hi Jack sorry Greg if a 454 magnum rectangular port motor has mech fuel pump is it a Gen 5 or 6 or what ever??Mid late90's motorThanks

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