Question about Cylinder stamp/ head stamp?
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  1. #1
    PWCToday Regular
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    Question about Cylinder stamp/ head stamp?

    So I have a 750 big pin engine that I'm in the process of rebuilding. After breaking down the engine I noticed that the cylinder has a "B" stamp on the cylinder but the cylinder head has a "C" stamp on it. Is there any concern with having a "B" stamp on the cylinder and a "C" stamp on the cylinder head? Thanks!

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    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: Question about Cylinder stamp/ head stamp?


  3. #3
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: Question about Cylinder stamp/ head stamp?

    A head with a "C" stamp would be from a 1995 SXi, ZXi, or STS 750 and originally would be with a # 24 cyl.
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  4. #4

    Re: Question about Cylinder stamp/ head stamp?

    No, the cylinder stamp relates to the piston used for assembly purposes at the assembly plant. The cylinder head stamp relates the dome volume size and the specific model year the engine was produced.

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    Re: Question about Cylinder stamp/ head stamp?


  6. #6
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    Re: Question about Cylinder stamp/ head stamp?

    Quote Originally Posted by 2strokesmoke View Post
    No, the cylinder stamp relates to the piston used for assembly purposes at the assembly plant. The cylinder head stamp relates the dome volume size and the specific model year the engine was produced.
    Thank you! This is my first rebuild and just noticed the difference in the head stamp and the cylinder stamp on the 750 big pin engine that came in the 93 X2 I bought. I'm going to have the cylinders bored and the head milled. So as long as I have the matching size pistons for the cylinder bore I should be OK?
    Last edited by TROL; 09-04-2020 at 02:45 PM.

  7. #7

    Re: Question about Cylinder stamp/ head stamp?

    Correct. The cylinder head stamp will only affect final compression # depending on what stamp cylinder you use it on.

  8. #8
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    Re: Question about Cylinder stamp/ head stamp?

    Quote Originally Posted by 2strokesmoke View Post
    Correct. The cylinder head stamp will only affect final compression # depending on what stamp cylinder you use it on.
    Thanks for the reply. Just want to make sure I'm covering everything on my first rebuild.
    Last edited by TROL; 09-05-2020 at 09:10 PM.

  9. #9
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    Re: Question about Cylinder stamp/ head stamp?

    Finally got my parts back from the machinist. After having the head milled I found out that the head is cracked. Now I need a new head for my 750 Big Pin. Any suggestions on what head to get? Do I just get a used head for a 750 BP engine or is there other spec's I need to consider? This is a fresh re-build going in a 93 X2.

    IMG_2813.jpg IMG_2814.jpg

  10. #10
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    Re: Question about Cylinder stamp/ head stamp?

    Quote Originally Posted by TROL View Post
    Finally got my parts back from the machinist. After having the head milled I found out that the head is cracked. Now I need a new head for my 750 Big Pin. Any suggestions on what head to get? Do I just get a used head for a 750 BP engine or is there other spec's I need to consider? This is a fresh re-build going in a 93 X2.

    IMG_2813.jpg IMG_2814.jpg
    I would install a stock big pin head and lighten up the pump load for good response. If you're racing a little more pump load and compression would be needed for best results.
    What exactly does the IJSBA do?

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