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454 investigation...well last hope..

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  • 454 investigation...well last hope..

    The original engine gave up the ghost...And what i found was a 454 in a rv...1983 rv to be specific. Compression and leak down test came out surprisingly well, however a new timing chain is order and the tinker bug has struck again. Dropping in a new cam could get some surprising results ive found and at the same time one key component is missing...Compression ratio.... it seems those old engines run 7.8/1 and what i need to get to is 8.5. And no i am not willing to go as far as new piston assy...frankly nor am i willing to go to Ovals...im fine with 4500 rpm...It seems milling is not the answer....actually i seem to be stuck here...Any thoughts or suggestions as to how one bump the C/R without a major rework...Smiles i do get what i am asking here...but if i could get to a smidge over 8...i could get big gains on the cheap so to speak.

    And yes the engine will be marianzed....

  • #2
    You need to start with what heads are on it, what combustion chamber, and what pistons.

    what is your issue with oval port heads? If you say you cant make power, you need to rethink that.
    Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

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    • #3
      There factory peanut heads...flat top pistons all factory stuff..If one can get the C/R up to 8.5 it is quite possible to get 420/40 hp but most importantly is very close to 500 ft lbs of power...and really inexpensively... And yes i do grasp the Ovals potential..

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      • #4
        "peanut heads" were only available on gen V motors. which is 1990-1995.

        specifically post your head casting numbers. most likely you have 049's which are not a bad head and will easily support 500 lb-ft. however you will need to mill them .030 to get the combustion chamber down to 114-115 range. you could have 781 heads.

        you need a smaller chamber. I would consider the L29 head (vortec) used on the 1996-2000 gen VI motors with flat tops. the heads flow well to about 5200 rpm and they have a 99cc combustion chamber
        Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

        1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

        Past Boats
        1970 Wooster Hellion - Merc 9.8
        2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
        1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

        What’s behind you doesn’t matter.Enzo Ferrari

        Comment


        • #5
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          At this point there is hope...last night i used a site to identify what was made during that time. I believe you to be correct which would be a happy moment...it seems marine ovals with small valves and a 4 bolt main was built during that time frame it also seems it is a bit haphazard. I need to go out to the garage and pull the head covers and get the block numbers...My personal experience with the 454 is very limited and the available information on... online sources are all over the place. I came back to this site for clarity and your depth of experience on this subject...i really enjoyed the overall build on your cruiser..very well done This will take a day or so in the meantime i thankyou for your clarity.

          Respectfully
          Tail_Gunner
          Last edited by Okimbackkinda; January 6th, 2020, 02:41 PM.

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