Help pick a piston
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Help pick a piston

  1. #1
    Senior Member Brendellajet's Avatar
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    Default Help pick a piston

    Trying to find a forged piston for a big block chevy for my dads new motor. Here are the specs:

    Bore: 4.280
    Rod 6.135-Floating pin
    Combustion chamber ~117cc(oval port 781 Casting that has been shaved)

    Cannot for the life of me locate a floating pin piston that will work in this application. Trying to achieve a 10:1 compression ratio. Would prefer go the Sealed Power route to keep costs down. If that isn't an option then we'll go with the next suitable option but we are trying to maximize power per dollar.

    I've researched Summit & Jegs and Im coming up empty handed. Everything I've found that would work has the press fit pin setup. If nothing is available My Dad will consider machining the pistons for the wire locks in the SP piston.
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  3. #2
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    Have you looked at the newer Keith Black forged pistons? The cost looks good (about $200 less than the other brands) and I saw alot of part#'s for alot of applications. I have no clue of anybody has used em or what they think but maybe worth a look for a USA made 100percent forged piston
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  4. #3
    Bostick Racing Engines six-oh-nine's Avatar
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    Quote Originally Posted by Brendellajet View Post
    Trying to find a forged piston for a big block chevy for my dads new motor. Here are the specs:

    Bore: 4.280
    Rod 6.135-Floating pin
    Combustion chamber ~117cc(oval port 781 Casting that has been shaved)

    Cannot for the life of me locate a floating pin piston that will work in this application. Trying to achieve a 10:1 compression ratio. Would prefer go the Sealed Power route to keep costs down. If that isn't an option then we'll go with the next suitable option but we are trying to maximize power per dollar.

    I've researched Summit & Jegs and Im coming up empty handed. Everything I've found that would work has the press fit pin setup. If nothing is available My Dad will consider machining the pistons for the wire locks in the SP piston.


    JE/SRP #212135
    4.280 Bore
    4.000 Stroke
    6.135 Rod
    1.645 Compression Height
    23 CC Small open chamber dome
    9.9:1 Compression ratio w/ 118cc chamber.

    I'd go with the SRP over the Sealed Power any day of the week for several reasons...
    1) Much better quality part
    2) Often times lighter weight
    3) Comparable price

    Hope this helps,
    The Bostick®

    Some people play hard to get... I play hard to want.
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  6. #4
    Senior Member Notalent's Avatar
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    Quote Originally Posted by Blue View Post
    Have you looked at the newer Keith Black forged pistons? The cost looks good (about $200 less than the other brands) and I saw alot of part#'s for alot of applications. I have no clue of anybody has used em or what they think but maybe worth a look for a USA made 100percent forged piston
    We use the KB Forged piston alot...its a very nice piston. Put it in alot of stroker motors 400-600HP and not a problem yet. These will become very popular.
    "Pain is a figment of your Imagination"
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  7. #5
    Senior Member hotbo's Avatar
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    Quote Originally Posted by Notalent View Post
    We use the KB Forged piston alot...its a very nice piston. Put it in alot of stroker motors 400-600HP and not a problem yet. These will become very popular.
    yes you are right my friend kieth blacks hypers are good pistons also have run alot of nos on the hypers with no problems ring end gap is very important on them.anyway go to kieth blacks web site and look up the pistons they have a ton of part #s to look and have compression calculators to achieve your goals,hope this helps.
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  8. #6
    It's what we do BDMarine's Avatar
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    Quote Originally Posted by six-oh-nine View Post
    JE/SRP #212135
    4.280 Bore
    4.000 Stroke
    6.135 Rod
    1.645 Compression Height
    23 CC Small open chamber dome
    9.9:1 Compression ratio w/ 118cc chamber.

    I'd go with the SRP over the Sealed Power any day of the week for several reasons...
    1) Much better quality part
    2) Often times lighter weight
    3) Comparable price

    Hope this helps,
    This would be my choice.
    http://www.performanceboats.com//signaturepics/sigpic837_1.gif
    B & D Marine Performance
    El Monte, Ca.
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  9. #7
    Senior Member Brendellajet's Avatar
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    Quote Originally Posted by six-oh-nine View Post
    JE/SRP #212135
    4.280 Bore
    4.000 Stroke
    6.135 Rod
    1.645 Compression Height
    23 CC Small open chamber dome
    9.9:1 Compression ratio w/ 118cc chamber.

    I'd go with the SRP over the Sealed Power any day of the week for several reasons...
    1) Much better quality part
    2) Often times lighter weight
    3) Comparable price

    Hope this helps,

    Im thinking we will go with the SRP. Up to my Dad but for the money i think the quality cant be beat. I did see this and was considering it but was hoping to find something forged for cheaper. Oh well, its not my money what do I care
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  10. #8
    No Sandbar To Far sanger rat's Avatar
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    I bought my LUNATI's from these fine folks. $350.00. You can call and buy them direct. http://stores.ebay.com/1-Predator-Ca...QQftidZ2QQtZkm
    Quote Originally Posted by One More Year View Post
    The only blab's I will even be a part of is just when it is me they are talking about. Aaaah yes I can see a few good looking shiny tall deck motors on the beach, with barely enough fuel to get back to the launch saying, "Holy crap how fast you think that Daytona was going man? That's like the 20th time he's gone by today?"
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  11. #9
    TEN THIRTY ONE RCB19's Avatar
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    Go with the SRP's. Hyper's dont work very well in a cold block application.
    RCB
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  12. #10
    DJD
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    6TH STREET MAFIA PRES. DJD's Avatar
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    Have you checked out the Mahle pistons yet? Very good price and a bad azz piston.
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  13. #11
    Senior Member hotbo's Avatar
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    Quote Originally Posted by RCB19 View Post
    Go with the SRP's. Hyper's dont work very well in a cold block application.
    really hmmmmmmmmmmthats funny i have run several sets without a single problemcould be the uneducated fellas setting the mills of with hypers,oh well

    the srps are about the best but you should really check the new kb forged out they are very nice
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  14. #12
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    I have a set of 10.8 forged KBs in my .030 454 with a 6.385 rod. Thy are full floaters with spiral locks. I dillasembeled the motor after one rough season and they look great. A KB779 will give about 9.7 in a .030 454 with a 117 chamber. If you are not running nitrous and want a good cheap forged piston they will due good. My machinest was surprised how consistant their sizes were piston to piston. I think they were around $350
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  15. #13
    gn7
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    if your willing to 0.060 over jegs is blowing these Mahles out at 495.00 with RINGS, phosphate coated pin bore and ring grooves and dry film skirts, I just bought a set and they are damn nice pistons, and some what better material the srp
    with plasma moly ductile ring package.
    http://www.jegs.com/i/Mahle/644/BBC6...756703%7C10219
    don't ask me why the .030 aren't om sale, call, maybe they are or are willing to sell for the same price



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  16. #14
    Senior Member H20MOFO's Avatar
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    Default hyperetics

    Is it true that hypers are denser therefore expand/contract more than a reg. forged piston, thats what I was told therefore the need to be set up even "looser". Also I was told they are heavier, I'm not telling, just asking?
    Another Hot Boat refugee
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