"Budget" 555 build
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"Budget" 555 build

  1. #1
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    Default "Budget" 555 build

    Looks like I have finally acquired enough pieces to drop it all off at the machine shop..

    .....Thought I would run it by you guys and see what ya'll think...

    This is going in a 24' I/O and has to run N/A for this summer but I plan on adding a Procharger next year as $$ permits..


    I'm well aware some of the parts I'm using are not the best out there but hopefully good enough to stay together and make reasonable power..


    Ok, with that all out of the way here's what I have....

    ....short block....
    Dart big M tall deck block billet mains 4.560 bore.
    Eagle forged 4.25" stroke crank turned 10 10
    Eagle 6.535 rods with ARP 2000 bolts
    Cleveite H series bearings.
    Manley forged 2618 pistons. -20cc dish. 1.520 CH
    Sealed Power Plasma Moly file fit rings.
    Pistons will be .005 in the hole..

    ......cylinder heads....
    Merlin "Grumpy Jenkins" Iron heads.. 320cc runners 119cc chambers
    2.25 in. stainless intakes 1.88 inconel exhaust
    Fel Pro .041" MLS head gaskets


    It'll be a Cam Motion hyd roller cam & lifters
    Something about 240in 248ex dur. .630" lift on a 114 lobe center
    (waiting on the heads to decide)

    .... Intake / Exhaust.....
    Cutler EFI intake with 42# injectors (for now)
    Fast throttle body Mefi 3 ecm
    Early K/E (Drake) manifolds dry to the tips.

    Hoping for 600hp at 6000 rpm N/A but don't know if the heads are gonna cut it...

    Now a couple questions I have....

    Will doing a bowl blend on the heads help much at all or is it just $$ wasted ?
    Speed Pro suggests .006" per inch of bore for ring end gap supercharged which comes out to .028" is this enough for supercharged marine use ?
    Manley suggests a piston to cylinder wall clearance of .006 for ALL BBC applications is this sufficient ?


    Any advise / input is greatly appreciated...

    Thanks,

    Doug
    Some call it A.D.D. I call it "multi tasking"

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  3. #2
    gn7
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    Quote Originally Posted by gn7 View Post
    Have you bought the heads yet?
    I bought them from a friend for $400.00.. One cylinder had dropped an exhaust valve.

    If it turns out they are going to need too much work to be worthwile he said he'll take them back though..

    I just hadn't found anything else for that kind of $$

    Thanks

    Doug
    Last edited by Boatally Insane; 03-29-2013 at 03:10 PM.
    Some call it A.D.D. I call it "multi tasking"

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  6. #4
    steelcomp was here
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    Quote Originally Posted by Boatally Insane View Post
    Looks like I have finally acquired enough pieces to drop it all off at the machine shop..

    .....Thought I would run it by you guys and see what ya'll think...

    This is going in a 24' I/O and has to run N/A for this summer but I plan on adding a Procharger next year as $$ permits..


    I'm well aware some of the parts I'm using are not the best out there but hopefully good enough to stay together and make reasonable power..


    Ok, with that all out of the way here's what I have....

    ....short block....
    Dart big M tall deck block billet mains 4.560 bore.
    Eagle forged 4.25" stroke crank turned 10 10
    Eagle 6.535 rods with ARP 2000 bolts
    Cleveite H series bearings.
    Manley forged 2618 pistons. -20cc dish. 1.520 CH
    Sealed Power Plasma Moly file fit rings.
    Pistons will be .005 in the hole..

    ......cylinder heads....
    Merlin "Grumpy Jenkins" Iron heads.. 320cc runners 119cc chambers
    2.25 in. stainless intakes 1.88 inconel exhaust
    Fel Pro .041" MLS head gaskets


    It'll be a Cam Motion hyd roller cam & lifters
    Something about 240in 248ex dur. .630" lift on a 114 lobe center
    (waiting on the heads to decide)

    .... Intake / Exhaust.....
    Cutler EFI intake with 42# injectors (for now)
    Fast throttle body Mefi 3 ecm
    Early K/E (Drake) manifolds dry to the tips.

    Hoping for 600hp at 6000 rpm N/A but don't know if the heads are gonna cut it...

    Now a couple questions I have....

    Will doing a bowl blend on the heads help much at all or is it just $$ wasted ?
    Speed Pro suggests .006" per inch of bore for ring end gap supercharged which comes out to .028" is this enough for supercharged marine use ?
    Manley suggests a piston to cylinder wall clearance of .006 for ALL BBC applications is this sufficient ?


    Any advise / input is greatly appreciated...

    Thanks,

    Doug
    Since you're going to be doing some repair, I'd suggest installing a 2.30 valve in those heads and porting the bowls and short turns accordingly. That would make them a decent set of heads. Might as well install a good ex valve for the blower app. while you're at it. I use Ferrea Super Alloy or Rev Inconel.
    As far as the rings and pistons, I'd go with what SpeedPro says on the rings but for the second ring, I'd use the same gap as the top.

    As for the pistons, .oo6 sounds like plenty but I'd talk with someone at Manley. I've never heard of one clearance recommendation for ALL engines. Typically on a large bore deal like that I'd add ~.0015 for cold water/hot piston marine use. Same with the guide clearances in the heads. Add a few tenths to the guide clearances.

    The cam will bring the package together. I'd be talking with someone like CStraub for a custom grind once you have the heads done and some flow numbers. Basically, though, it sounds like a decent combo.
    Last edited by scott foxwell; 03-29-2013 at 03:24 PM.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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