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  1. #31
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    Tom is a great guy, I buy from him often. As with the V4 compression on an * should not be compared with a 6 as the 8 has two sets of runners like a 4. While the cut late model heads are an option they dont make the power of a 2.7 head.

  2. #32
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    My 2.7 heads should arrive on Monday, but I won't have time to test before going to work on my ship. (Btw- the engine on my ship is also a 6 cylinder 2-stroke, but the stroke lenght is over 6 feet and it's turning 94rpm at full speed @ 14knots) I'm planning to first install them and leaving the relief holes unplugged and see what the comp will be. I will then decide if I will plug those holes or not.
    Hal

    "Ton o' metalflake" 1982 Concord Mach II with 1997 Johnson 225 Venom

  3. #33
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    I would love to see if any top-end increase is there, I know bottom and mid will get much better, Matt

  4. #34
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    Maybe it will let you run a little more prop because it builds torque?
    I was going so slow I almost crashed. - JamesGang

    1978 24 Superboat - 250 EFI
    Sold: 1991 Starliner - 250 EFI Merc 3.0

  5. #35
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    Quote Originally Posted by oldschoolltv View Post
    I would love to see if any top-end increase is there, I know bottom and mid will get much better, Matt
    I sold a set to a guy who claimed 3 MPH's.
    I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.


    I refuse to allow common sense to interfere w/my boat buying decisions.


    Checkmate 16' 140 Johnson
    Hydrostream 17' Vector FrankenRude I
    Laser 480 (?) 21' w/GT 200
    Glastron Carlson Conquest w/XP 2.6
    Glastron Carlson CVX 20 w/XP 2.6
    24' Sonic w/twin 250 Johnsons
    24' Sonic w/twin 250 HO Johnsons
    19' STV River Rocket w/FrankenRude II
    Allison XR 2002 w/Frankenrude II
    Hydrostream 18' V-King w/Frankenrude II

  6. #36
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    I have a new 32p prop now and I just need to give it a try sometime, it is an 88 block do I need to change any cooling lines etc..???? or is it only on the closed deck blocks?

  7. #37
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    Quote Originally Posted by oldschoolltv View Post
    I have a new 32p prop now and I just need to give it a try sometime, it is an 88 block do I need to change any cooling lines etc..???? or is it only on the closed deck blocks?
    Should be good to go other than jetting.
    I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.


    I refuse to allow common sense to interfere w/my boat buying decisions.


    Checkmate 16' 140 Johnson
    Hydrostream 17' Vector FrankenRude I
    Laser 480 (?) 21' w/GT 200
    Glastron Carlson Conquest w/XP 2.6
    Glastron Carlson CVX 20 w/XP 2.6
    24' Sonic w/twin 250 Johnsons
    24' Sonic w/twin 250 HO Johnsons
    19' STV River Rocket w/FrankenRude II
    Allison XR 2002 w/Frankenrude II
    Hydrostream 18' V-King w/Frankenrude II

  8. #38
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    I get kinda envious when you are talking about 32" props... I'm thinking I have to get myself a lightweight hull soon. The Concord is great for family fun on the lake, but it's just too heavy for those high speed runs. My goal is to get it up to 70mph.
    Hal

    "Ton o' metalflake" 1982 Concord Mach II with 1997 Johnson 225 Venom

  9. #39
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    I feel your pain norsk, I'd be pretty good with somewhere near 70 with my current motor.

    John
    I was going so slow I almost crashed. - JamesGang

    1978 24 Superboat - 250 EFI
    Sold: 1991 Starliner - 250 EFI Merc 3.0

  10. #40
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    Well then I feel pretty good, I've hit 70 on the mark. No set up or prop yet. Still learning to keep it under control. Hope to swap the lowers soon.

  11. #41
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    Right now I can only get it up to 61, but none of my props fits too well. I have been fighting all kins of fuel problems since i got the motor and had to figure that out first. Now that's solved and I can start setting up for some more speed. First I will get those 2.7 heads on, get it jetted properly and then I think I will need a 8 - 12" jack plate and a good prop.

    If I want to scare myself, I can always slack the steering cables a turn. Then I get crazy chine walk at 55;-)
    Hal

    "Ton o' metalflake" 1982 Concord Mach II with 1997 Johnson 225 Venom

  12. #42
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    Quote Originally Posted by Gorilla0178 View Post
    Well then I feel pretty good, I've hit 70 on the mark. No set up or prop yet. Still learning to keep it under control. Hope to swap the lowers soon.
    that boat should run up around 90. my vking ran 87.8 with a bone stock 95 200hp and a pos prop. Definitely had 90 in it.
    Quartershot T-3R 15" 3.5L E-Tec 1.62 Sportmaster


  13. #43
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    hi a omc race tech did an report on using the 27 heads on a early 3 litre cut the heads 50'' in a hot boat mag some years ago we did the mod on a 500 pound boat 130 com and the motor pulled a 14 x 30 cleaver to 6800 cheers 1850 bullet

  14. #44
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    90 , I hope it'll go 90. I hope I can drive it to 90. That would be awesome!!!!!!

  15. #45
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    I watched Bobby sr run his 16 with a stock 225 to 90 it was about the second pass he made with the new setup as they just put the motor on that week

    Actions are awesome...
    Quartershot T-3R 15" 3.5L E-Tec 1.62 Sportmaster


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