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  1. #1

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    155hp or 185hp Short Block How to Tell The Difference

    Need help on How to Identify 03/2002 185hp From 155hp Block, just trying to figure out how my 2004 SC-185hp center piston just grenade was told not from Lack of Fuel, No Code On Display, Just wondering the motor was replace with a 155hp 03/2002 (M5528711) block, Instead of Rebuild, Any ideas will Appreciated.

  2. #2
    Orlando Shark's Avatar
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    My understanding is that block is the same, pistons are what change. The 155 are cast, the 185 are forged. I should have a 155 piston in my garage I can check once I get home tomorrow for a specific part number for you.

  3. #3

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    Thank you, I tried to post a picture of piston did not work, my 2004 GTX-185hp SC piston are flat top with a stamp on top 97 and 99.96.
    Last edited by grinchmonster2000; 11-26-2019 at 05:08 AM.

  4. #4
    Quote Originally Posted by Shark View Post
    My understanding is that block is the same, pistons are what change. The 155 are cast, the 185 are forged. I should have a 155 piston in my garage I can check once I get home tomorrow for a specific part number for you.
    IIRC, the 185 are cast, 215 and above forged.

  5. #5

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    All S/C pistons are dished, still have eyebrows for valves but a pronounced lip around outside forming a dish when viewed from the top. All non S/C pistons are dead flat across the top except for the valve eyebrows. A flat top in an S/C motor would cause massive detonation and either a meltdown or shatter event.

  6. #6

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    First Picture is what was Center Piston, Last is Outside Piston that is not concave or dished to lower compression, I got about 25hrs on rebuild until Boomm.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  7. #7

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    Yup, 155 piston. Bet it went like stink before it blew up though! That's an ill fated extra 25hp right there

  8. #8
    Quote Originally Posted by grinchmonster2000 View Post
    Need help on How to Identify 03/2002 185hp From 155hp Block, just trying to figure out how my 2004 SC-185hp center piston just grenade was told not from Lack of Fuel, No Code On Display, Just wondering the motor was replace with a 155hp 03/2002 (M5528711) block, Instead of Rebuild, Any ideas will Appreciated.
    2002 was first year for 4 tech. There were no supercharged engines that year.


  9. #9

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    agree with above, without a doubt cast 155 piston. The blocks are the same though, just different pistons, flywheels and has a supercharger.

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