blower engine build ?
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blower engine build ?

  1. #1
    Senior Member Scapegoat's Avatar
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    Default blower engine build ?

    If you were building a pump gas blower engine for a lake boat with 6lbs boost expected
    B&M mega 420, lee chiller, dual 850 holley boost ref.
    MK IV 454 block bored .40 over.
    2 bolt now, convert to 4 bolt.?
    rods I beam or H beam?
    aluminum heads. brand and size?
    pistons?
    Compression goals? etc.
    semi budget....
    What would you build

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    Senior Member TexasJet's Avatar
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    You were doing so well till you said "semi budget".

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    Senior Member Scapegoat's Avatar
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    Right, kinda an oxymoron. Lol

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    Senior Member TexasJet's Avatar
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    It would help a lot if we knew your budget. If it's $5000 the parts would be different than if it's $15000. Give us a starting point. As an example, I'm building a blown 540, probably gonna cost in excess of $18000 and I have some of the parts already. TJ

  7. #5
    gn7
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    Right off the bat, the .040 bore screams BUDGET!!
    Who makes .040 pistons that aren't budget pistons. Icon and Speed pro? Anybody else?



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  8. #6
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    Quote Originally Posted by Scapegoat View Post
    If you were building a pump gas blower engine for a lake boat with 6lbs boost expected
    B&M mega 420, lee chiller, dual 850 holley boost ref.
    MK IV 454 block bored .40 over.
    2 bolt now, convert to 4 bolt.?
    rods I beam or H beam?
    aluminum heads. brand and size?
    pistons?
    Compression goals? etc.
    semi budget....
    What would you build
    I would go 4 bolt mains, with studs. IMO you have a potential 750-850HP combo with the right parts on pump gas. 2 bolt mains isnt what i would want there.

    I would go H Beam. (An H beam really doesnt cost much more than an i beam)

    I would go with a quality blower piston with upgraded pins.


    I have a pair of 468ci, with B&M 420's, 6lbs of boost, that made 804HP at 6200 on pump gas. They have been in my boat for 2 summers running great in this form.

    Mine are
    MARK IV blocks
    4 bolt mains with ARP stud kit
    GM 4'' steel crank
    Manley H beam rods with ARP 2000 bolts
    JE flat top blower pistons
    older Dart 308 Race series alum heads with some port work
    236/245 .630 lift, 114LSA Hyd Rollers
    Morel 4603 lifters
    Isky springs.
    Twin 850 Holleys.
    B&M 420's non intercooled
    MSD distributor with Crane ignition box. Timing locked at 32.

  9. #7
    Senior Member Scapegoat's Avatar
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    Quote Originally Posted by Mild Thunder View Post
    I would go 4 bolt mains, with studs. IMO you have a potential 750-850HP combo with the right parts on pump gas. 2 bolt mains isnt what i would want there.

    I would go H Beam. (An H beam really doesnt cost much more than an i beam)

    I would go with a quality blower piston with upgraded pins.


    I have a pair of 468ci, with B&M 420's, 6lbs of boost, that made 804HP at 6200 on pump gas. They have been in my boat for 2 summers running great in this form.

    Mine are
    MARK IV blocks
    4 bolt mains with ARP stud kit
    GM 4'' steel crank
    Manley H beam rods with ARP 2000 bolts
    JE flat top blower pistons
    older Dart 308 Race series alum heads with some port work
    236/245 .630 lift, 114LSA Hyd Rollers
    Morel 4603 lifters
    Isky springs.
    Twin 850 Holleys.
    B&M 420's non intercooled
    MSD distributor with Crane ignition box. Timing locked at 32.
    Cool thanks

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