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  1. Re: Rebuilding Mark IV's 454 cid with one counter rotating

    The big issue with the roller rockers, under the stock tin, is the oil baffle. Their height is a bit short as well. Those 'mid-height' covers, when they can be found, are the best solution as there's...
  2. Re: Rebuilding Mark IV's 454 cid with one counter rotating

    more CR = more Torque but also means the engine is more senistive to detonation....so that's all trade space.

    When we rebuilt the MarkIVs, I think the resulting CR was ~8.5:1...ethanol was just...
  3. Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    I'd be inclined to think the plumbing on the suction side of the pump isn't air-tight....

    I'll expand on bondo's suggestion and say the raw water pumps should be given a major service...
  4. Re: Rebuilding Mark IV's 454 cid with one counter rotating

    without know what condition your current stuff is in, I can't comment on new blocks - most everything I've seen is short (or standard) deck height.

    stroking a BBC isn't cheap. Agree that...
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    Re: 5.7 oil cooler changeout

    The fittings should be Flare (hose side) to NPT (cooler side) so , PST should be fine for the NPT side.....
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    Re: 5.7 oil cooler changeout

    Like matta said, there aren't any shortcuts.....the installation i the hull drives access and I'm sure you are baselined there....

    Besides the pads, a good set of flare wrenches will come in...
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    Re: Gen V 454 owners

    you answered your own question....the engine has a max WOT rating and having a carb that delivers the appropriatedly scaled volume of air is all that is needed. In other words, for a given...
  8. Re: Replace head gaskets as preventative maintenance?

    Actually, the numbers are 'servicable' per the GM updated 'compression test' procedure....
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    Re: Gen V 454 owners

    You don't need a carb any larger than what the engine needs and a bigger one won't improve the WOT performance at all. Setting up the proper carb in an optimal manner for how you use it will be money...
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    Re: Gen V 454 owners

    Got it....a BBC inboard doesn't need more than a 600 CFM carb....

    Re the 4010/4011, I'm pretty sure they are 'orphans' as Holley hasn't made them in years....if you find one, it will be...
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    Re: Engin limp mode and backfires

    a good mechanic with the scanner should be able to identify the root cause soon after it happens....I'd suggest a thorough diagnosis without speculation if you want to find the issue in the least...
  12. Thread: The Edit icon

    by makomark
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    Re: The Edit icon

    its only 'alive' for ~ 10 minutes after the original reply gets 'posted'.....at least that's been my experience.
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    Re: Gen V 454 owners

    They are 4011's.....if you look at the front of the air horn, there should be two sets of numbers stamped into the front (vertical wall) of the air horn. the top number is the "LIST" number - aka...
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    Re: Supercharger on a marine TBI?

    The GM TBI system was orphaned decades ago - parts are available but you will pay once you find them....

    And, based on the link, getting it to fit will be a challenge unless its going into a wide...
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    Re: 25hp EFI merc, No compression?

    Or the seats have eroded due to "(this engine does have a lot of time on it)".....
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    Re: What Trans do I have?

    The gear should have an ID plate - that should show the model and serial numbers along with who made it....
  17. Re: 1977 Chapparal Sunesta 232 Throttle Control

    Its probably time to remove the box and give it an overhaul.....depending upons its condition (worn/damaged parts) if may be more cost effective to get a new control box.....and while you're at it,...
  18. Re: What brand of trolling motor to purchase?

    did you check the shaft to make sure it was true?? if not, changing the bronze wont last long....
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    Re: what is this in the exhaust stream?

    if it is clear (vs yellow tint), its not tygon.....better make sure what ever is there will tolerate the fuel you use....

    and there should be a tube from the port side pump....does the pump have...
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    Re: 454 XL runs smooth for 60sec then rough

    Should be a Gen V block - only electric there... :)
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