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  1. #1
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    Horsepower Freaks offering built/sleeved S54 shortblocks with options up to 1200 horse capacity

    Horsepowerfreaks (HPF) has released pricing and details on their S54 shortblocks. There are 4 options whose full specs are listed below. The first one offers a slight overbore, second is an OEM bock, third is a Darton sleeved underbored used block, and the fourth is a Darton sleeved underbored new OEM block with 1200+ rwhp capacity. Great to see these options from HPF.

    Option 1 (900rwhp - .020 Over Bore) $7,495.00
    • Send your used short block complete with crank, rods and pistons to us or pay a $2500 core charge
    • Strap your block securely to a pallet
    • It should be a motor that has never been bored or honed
    • We will magnaflux it and check for cracks when we receive it
    • We will build it to HPF specifications at .020" over bore

    Option 2 (1000rwhp - STD Bore) - New OEM Block $9,995.00
    • Securely Ship your used crankshaft to us or we will sell you one for $900
    • Greater wall thickness than option 1 from not having to bore cylinder walls
    • Greater head sealing surface area between cylinders
    • Built to HPF specifications at STD bore

    Option 3 (1200rwhp+ - .040 Under Bore) - Darton Sleeved Used Block $10,495.00
    • Send your used short block complete with crank, rods and pistons to us or pay a $2500 core charge
    • We will magnaflux it and check for cracks when we receive it
    • Darton sleeves are 4 times stronger than the OEM factory cylinder walls
    • Cylinder wall thickness increased drastically
    • Head sealing surface area increased significantly
    • Built to HPF specifications at .040" under bore

    Option 4 (1200rwhp+ - .040 Under Bore) - Darton Sleeved New OEM Block $12,995.00
    • Securely Ship your used crankshaft to us or we will sell you one for $900
    • Darton sleeves are 4 times stronger than the OEM factory cylinder walls
    • Cylinder wall thickness increased drastically
    • Head sealing surface area increased significantly
    • Built to HPF specifications at .040" under bore


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  2. #2
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    Damn that's not bad! I got quoted 18k for an n54 build Click here to enlarge
    JB4LIFE

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    Good for S54 owners , but what about S65 people ?

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    Click here to enlarge Originally Posted by mazdaspeed6 Click here to enlarge
    Damn that's not bad! I got quoted 18k for an n54 build Click here to enlarge
    $18k? Absurd.

  5. #5
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    Click here to enlarge Originally Posted by Sorena Click here to enlarge
    Good for S54 owners , but what about S65 people ?
    HPF doesn't do the S65. Your only option at this point is really Gintani because no one else can do built motors.

  6. #6
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    I wonder how this will effect the "daily driveable-ness" of HPF kits? In the 350Z world we alway had head hasket issues due to the expansion rates of the sleeve vs block. They were deemed not good for a car meant to be daily driven. Of course those were aluminum blocks. How does this work with the S54's Iron block?

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    I gotta say that unless there is a history of these blocks being weak I can't imagine why you would sleeve this block. A rb26 which is a similar inline 6 has been taken to 1400hp with no problems.

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    Rb26 has alot thicker cylinder walls

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    Click here to enlarge Originally Posted by mazdaspeed6 Click here to enlarge
    Damn that's not bad! I got quoted 18k for an n54 build Click here to enlarge
    If want a better price shoot me a pm.
    Click here to enlargeClick here to enlarge

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    I'd like to know how they are selling a 1200 rwhp motor without having ever made 1050 rwhp.

    They had one car (tran) @ 1022 rwhp that blew up, they put it back together and downgraded things and it makes like 900 rwhp. Optimistic? Yes.


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    Click here to enlarge Originally Posted by Jimefam Click here to enlarge
    I gotta say that unless there is a history of these blocks being weak I can't imagine why you would sleeve this block. A rb26 which is a similar inline 6 has been taken to 1400hp with no problems.
    It's due to the cylinder walls. They made it fairly compact by sitting the cylinders as close to one another as they could.

  12. #12
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    Click here to enlarge Originally Posted by 5mall5nail5 Click here to enlarge
    I'd like to know how they are selling a 1200 rwhp motor without having ever made 1050 rwhp.
    They aren't selling that or saying that. They are simply saying the block can handle 1200+

  13. #13
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    Click here to enlarge Originally Posted by GG///M3 Click here to enlarge
    If want a better price shoot me a pm.
    yea that was from headway performance, custom piston/ rods, cam, valve train and possibly sleeved block... i am selling my car in a month or so i want a decent daily driver and i want to save up for a another car project... thanks tho GG.. p.s are you in CT? hit me up with a pm
    JB4LIFE

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    They aren't selling that or saying that. They are simply saying the block can handle 1200+
    How can they possibly know that? Notice it says "1200+ rwhp". So they made some 1400 hp on an S54 that we don't know about? $#@!, my block will withstand 1200+ rwhp. At least once.


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    Click here to enlarge Originally Posted by 5mall5nail5 Click here to enlarge
    How can they possibly know that? Notice it says "1200+ rwhp". So they made some 1400 hp on an S54 that we don't know about? $#@!, my block will withstand 1200+ rwhp. At least once.
    You don't have to hit 1200 rwhp to have a good idea of what the block will handle. I'm sure Darton has a pretty good idea of what the blocks they sleeve will take without actually taking each and every one to that horsepower level.

    I think you are really reaching here, come on, just appreciate they are offering more parts and options. This is a good thing...

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    You don't have to hit 1200 rwhp to have a good idea of what the block will handle. I'm sure Darton has a pretty good idea of what the blocks they sleeve will take without actually taking each and every one to that horsepower level.

    I think you are really reaching here, come on, just appreciate they are offering more parts and options. This is a good thing...
    Sorry I am a firm believer in not making $#@! up - if it hasn't been tested, don't claim it.

    They built a 1022 rwhp unit and it blew up. They rebuilt it with the smaller bore sleeve setup and it made LESS horsepower. Assume nothing, especially in the 1000 hp range.


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    0 out of 1 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by 5mall5nail5 Click here to enlarge
    Sorry I am a firm believer in not making $#@! up - if it hasn't been tested, don't claim it.

    They built a 1022 rwhp unit and it blew up. They rebuilt it with the smaller bore sleeve setup and it made LESS horsepower. Assume nothing, especially in the 1000 hp range.
    +1
    Click here to enlargeClick here to enlarge

  18. #18
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    Click here to enlarge Originally Posted by 5mall5nail5 Click here to enlarge
    Sorry I am a firm believer in not making $#@! up - if it hasn't been tested, don't claim it.
    Why wouldn't Darton have tested their sleeves? If they advise the blocks are capable of 1200+, I believe them, why wouldn't I? They do it for a living and have done so successfully for a long time. It isn't HPF just making up numbers out of the blue. Just because they don't have a 1200 whp kit does not mean the block is not 1200 whp capable.

    Click here to enlarge Originally Posted by 5mall5nail5 Click here to enlarge
    They built a 1022 rwhp unit and it blew up. They rebuilt it with the smaller bore sleeve setup and it made LESS horsepower. Assume nothing, especially in the 1000 hp range.
    I'm not familiar with that failure but there can be many causes for an engine failure beyond the block. We are talking iron blocks that are sleeved. When I spoked to Chris he told me the blocks were about 4 times as strong as stock when sleeved by Darton. The stock block being strong considering it is made out of iron.

    You don't have to look negatively on everything HPF does. They aren't even the ones sleeving these blocks.

  19. #19
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    Darton can rate the sleeve all they want - I am more familiar with sleeved blocks than you may know. Steel liners in an iron block expand at different rates and can crack the iron around them. I would not make a 1200 rwhp claim when my 1022 rwhp setup broke. I will praise HPF when they do something intelligent/proper.


  20. #20
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    Click here to enlarge Originally Posted by 5mall5nail5 Click here to enlarge
    Darton can rate the sleeve all they want - I am more familiar with sleeved blocks than you may know. Steel liners in an iron block expand at different rates and can crack the iron around them. I would not make a 1200 rwhp claim when my 1022 rwhp setup broke. I will praise HPF when they do something intelligent/proper.
    I think that is why the block is underbored... I also don't believe that 1022 rwhp setup was the same block as what is being quoted here as being 1200 rwhp capable.

  21. #21
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    I think that is why the block is underbored... I also don't believe that 1022 rwhp setup was the same block as what is being quoted here as being 1200 rwhp capable.
    The 1022 setup blew up due to tuning/methanol failure (the system they say has infinite failsafes)

    The block that was built to replace it was the debored sleeved setup good for "as much as can be thrown at it" yet they turned it back to 900 hp or something. Mtran is the owner.


  22. #22
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    Click here to enlarge Originally Posted by 5mall5nail5 Click here to enlarge
    The 1022 setup blew up due to tuning/methanol failure (the system they say has infinite failsafes)
    Ok, so why are you equating this with a block failure?

    Click here to enlarge Originally Posted by 5mall5nail5 Click here to enlarge
    The block that was built to replace it was the debored sleeved setup good for "as much as can be thrown at it" yet they turned it back to 900 hp or something. Mtran is the owner.
    And is it running fine? I don't know if he wants to be a test mule to establish just how much he can push.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Ok, so why are you equating this with a block failure?



    And is it running fine? I don't know if he wants to be a test mule to establish just how much he can push.

    You don't get it - I am sure my M50 stock block could do 1500 rwhp. I could fill the block 1/2 up with epoxy and go for broke. However, these are being marketed as 1200+ rwhp long blocks... they have never made 1200 rwhp they don't know that the pistons are good enough, rods are good enough, hell we don't know that the cranks are good enough. I have no doubt a steel sleeve will contain the pressure for a bit, but that's the least of the issues. Mtran continuous ripped on his car and the motor was severely damaged throughout. So they boasted his rebuild as more, bigger, better, stronger... then they turned it down by 100+ rwhp. They don't have a working setup for 1200 rwhp, its speculation. If you go by what Eagle says about their rods, a 4 cylinder BMW rod they make is good for 225 hp each (900 hp) - so we're to assume their 6 cyl kit will hold 1350 hp? GTFO. A lot of guys are turning over 820 hp on Eagle rods (myself included) but that doesn't mean I am about to trust them up to 1350. This is common sense.


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    1 out of 1 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    I think that is why the block is underbored... I also don't believe that 1022 rwhp setup was the same block as what is being quoted here as being 1200 rwhp capable.
    You are correct in the 1022rwhp setup being not the sleeved block. The replacement sleeved block only made ~900whp. So to date, the sleeved blocks are only good to mid-900's IIRC, and the non-sleeved are good to far lower than that. I would also like to inquire as to the redesign of the piston to prevent shearing of oil squirters. Has HPF figured that out? Brand new oil squirters being clipped by the skirts, chewed up, and dropped into the pan speaks volumes to the end user about the level of engineering present. A second inquiry that is also pertinent to the sale of $$ built blocks would be the complications of HPF's machine shop not knowing how to spec a crankshaft. Hopefully that has been resolved so customers do not randomly have oil pressure failures related to shoddy blueprint work. That way they will only have to be worried about shoddy engineering of the pistons in their claimed 1200whp capable motors.

  25. #25
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    Yes, the oil squirters in the bottom of the pan was another oversight. That one kind of went under the radar.


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