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  1. #1

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    Super Charged vs NA Piston

    Hi, I just bought a used 1503 short block for my RXP215 and the seller wasn't 100% sure if it was a Super Charged or NA. I pulled the pistons as I was going to do replace the bearings anyways and I compared them to known NA Pistons I had and my original pistons from the 215 and couldn't tell the difference. That or if I could tell by the block P/N that would work as well.

    Also does anyone know the difference between the NA (420837621) and FI camshaft (420837629) Some people seem to say they are interchangeable and some say no.

    Thanks
    Last edited by kingofl337; 05-23-2022 at 11:13 AM.

  2. #2
    1tommygunner1927's Avatar
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    Quote Originally Posted by kingofl337 View Post
    Hi, I just bought a used 1503 short block for my RXP215 and the seller wasn't 100% sure if it was a Super Charged or NA. I pulled the pistons as I was going to do replace the bearings anyways and I compared them to known NA Pistons I had and my original pistons from the 215 and couldn't tell the difference. That or if I could tell by the block P/N that would work as well.

    Thanks
    N/A pistons are cast vs forged for the S/Cer pistons. PTO cover will have a hole in it for the S/Cer, its blocked off for and NA engine.

  3. #3
    ptscon's Avatar
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    It's easy to tell the two pistons apart. NA pistons have a flat top while Supercharged ones have a dome shaped one.

  4. #4

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    Quote Originally Posted by kingofl337 View Post
    Hi, I just bought a used 1503 short block for my RXP215 and the seller wasn't 100% sure if it was a Super Charged or NA. I pulled the pistons as I was going to do replace the bearings anyways and I compared them to known NA Pistons I had and my original pistons from the 215 and couldn't tell the difference. That or if I could tell by the block P/N that would work as well.

    Also does anyone know the difference between the NA (420837621) and FI camshaft (420837629) Some people seem to say they are interchangeable and some say no.

    Thanks
    A picture of what you have would be tremendously helpful.

  5. #5

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    A short block doesn't have any covers. It's a crank, pistons, and cases.

  6. #6

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    Here are my pistons

    left is unknown, middle NA, right known SC

    Based on what you guys are saying is the middle SC as well?

    Edit: I went on eBay and searched and I see the difference.

    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by kingofl337; 05-23-2022 at 12:44 PM. Reason: found answer

  7. #7
    tiderider's Avatar
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    I would just part it all out. If you do build one, let us know if you get more then 10 hours out of it..

  8. #8

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    Make sure the head your using has the good valves in it...the last 2 numbers are 75 fir the good ones...the 72 exhaust valves are the hollow or bad valves....


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