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Thread: Darton sleeves

  1. #1
    CRS's Avatar
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    Darton sleeves

    This may interest some of you. Got about 8 hrs on my Darton sleeved block now,5 1/2 of them racing. So far so good,no sign of bore walking or flexing as now the bores are solid steel not the steel in Aluminium stock method.First pic is of difererent styles of sleeves I have used the H series open deck type.
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  2. #2

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    i know this is a really old thread but where can I get these sleeves and how much did they cost you to put in? I have a 215 sc with a cracked sleeve and the aluminum is cracked as well.

  3. #3
    rxpdoo's Avatar
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    Quote Originally Posted by toxicgun View Post
    i know this is a really old thread but where can I get these sleeves and how much did they cost you to put in? I have a 215 sc with a cracked sleeve and the aluminum is cracked as well.
    you can send your cases to mazworxs in orlando fl they have done it in the past #407-281-1223 figure around $1500 with add. 1/2 inch arp headstuds

  4. #4
    "Hustler" Inkaddict's Avatar
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    Quote Originally Posted by rxpdoo View Post
    you can send your cases to mazworxs in orlando fl they have done it in the past #407-281-1223 figure around $1500 with add. 1/2 inch arp headstuds
    +1... Mark at Mazworx does a great job with these... There beastly blocks and they make stupid power.

  5. #5
    MSRXP's Avatar
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    Mark Mazerowski is a bad dude! He can build some kick ass stuff. He built the 8sec Titan Supra.... Great guy all around..

  6. #6

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    sweet, I found their webpage and was going to ask if anyone had experience with them. $865ish for the sleeves and $350 to install. Sounds like the way to go. Just gotta tear it all the way down and check for any additional broken parts.

  7. #7

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    so the block can withstand more abuse after this I assume. Any upgrades for the valves as it seems the valve is what caused this problem in the first place.

  8. #8
    Vern's Avatar
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    Curious too ... if you have a block with damaged cylinders, and want to upgrade, this looks good. How big can you go on the bore? Do you gain significant performance from boring these out to the largest size? I guess I am asking what is the largest available piston / how big bore you can go, and is it a noticeable performance increase?

  9. #9
    Eastside Powersports Slow 91's Avatar
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    not sure what performance gains you would see with larger bores, they are really big already.

  10. #10
    suck my wake's Avatar
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    Quote Originally Posted by Vern View Post
    Curious too ... if you have a block with damaged cylinders, and want to upgrade, this looks good. How big can you go on the bore? Do you gain significant performance from boring these out to the largest size? I guess I am asking what is the largest available piston / how big bore you can go, and is it a noticeable performance increase?
    104mm is the biggest you can bore them out to. A bigger piston has the potential to increase the torque output of the motor but I don't know if I'd be spinning this motor to 9k+, that might not be a good idea. Would have to do the math concerning piston speeds with the larger pistons. There is not alot of info on this mod with these motors. Its been a highly guarded secret and a costly mod, about 900 for the sleeves, then another 300+ to macine the block and install THEN you have to buy custom pistons and custom head gasket so your lookin around the $2500 For most this would be a total waste of time and considering you can get a stock bore block to do over 90 mph.........Why???

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