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    • Weistec releases CNC ported/polished M156 (C63 AMG) aftermarket heads 50+ hp gains, $4895

      Weistec has released CNC ported heads for the Mercedes M156 6.2 liter V8 engine. Weistec claims this is the first head solution although we believe MHP had an option available first. Regardless, claim is a 40-50 horse gain on naturally aspirated motors and 70-80 on supercharged motors. No dynos released but flow charts are below.

      Key Features:
      5-axis CNC machined
      397.88 CFM Intake flow
      257.81 CFM Exhaust flow
      Fully assembled, Read to run heads
      Custom ground factory 40mm intake valves
      Custom ground factory 33mm exhaust valves

      Heads can add an extra 40-50 HP on naturally aspirated engines, and up to 70 HP on supercharged engines with stock cam shafts.

      $4,895 with core exchange.

      Supported Platforms
      2007-2010 S63 AMG
      2007-2011 ML63 AMG
      2007 R63 AMG
      2007-2008 CLK63 AMG
      2008 CLK63 Black Series
      2007-2010 CLS63 AMG
      2008-Present C63 AMG (Sedan and Wagon)
      2007-Present E63 AMG (Sedan and Wagon)
      2008-2010 CL63 AMG
      2009-Present SL63 AMG













      This article was originally published in forum thread: Weistec Releases Heads started by DD GT3 RD View original post
      Comments 47 Comments
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by MHP LLC Click here to enlarge
        Pretty much everything, valve angles, port shapes/contours/sizes, quality of short/long turns, bowl blending, etc. I think they remove more material than we do and we leave the guides longer for longer valvetrain life and stability, mowing them down isn't worth 8-10cfm there are other ways to gain and N/A it's about velocity. That being said most of these heads will be paired with their superchargers so the extra port size won't matter as much due to the blower supplying the velocity.
        Would you change your heads at all if they were intended for a forced induction application?
      1. DD GT3 RD's Avatar
        DD GT3 RD -
        Click here to enlarge Originally Posted by MHP LLC Click here to enlarge
        Never tried it on a stock exhaust car, it would be a waste IMO no question.
        thanks for your honesty
      1. MHP LLC's Avatar
        MHP LLC -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Would you change your heads at all if they were intended for a forced induction application?
        Not one bit, nor for a nitrous app. Unless you're talking 2000HP build or something nuts anyway. Cams for sure, heads nope an optimal head is an optimal head. I would probably go with 34mm exhaust valves (this is optional with our ported heads and come standard on SLS/M159 heads) but I would do that N/A as well.
      1. MHP LLC's Avatar
        MHP LLC -
        Click here to enlarge Originally Posted by DD GT3 RD Click here to enlarge
        thanks for your honesty
        My pleasure. There are relatively large and less expensive gains like headers and airboxes that should be addressed before ported heads.
      1. DD GT3 RD's Avatar
        DD GT3 RD -
        Click here to enlarge Originally Posted by MHP LLC Click here to enlarge
        My pleasure. There are relatively large and less expensive gains like headers and airboxes that should be addressed before ported heads.
        no doubt, was just curious...also I have had super loud cars (no mufflers on the gt3 for a bit) and well I just dont think im ready to go that route here...so just looking into everything
      1. MHP LLC's Avatar
        MHP LLC -
        Click here to enlarge Originally Posted by DD GT3 RD Click here to enlarge
        no doubt, was just curious...also I have had super loud cars (no mufflers on the gt3 for a bit) and well I just dont think im ready to go that route here...so just looking into everything
        No harm in asking. Click here to enlarge
      1. Itsbrokeagain's Avatar
        Itsbrokeagain -
        I see the valves needed very little, if none, work around the seat..no unshrouding needed huh? The runners look like they will flow exceptionally well.