AC Delco Spark plug issue
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AC Delco Spark plug issue

  1. #1
    Off Road Badass Bonzen's Avatar
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    Default AC Delco Spark plug issue

    Have always ran the AC Delco R43T plugs. Now Autozone says they are unavailable now. They have a R43TS that has an extended tip (the post and electrode stick out about 1/16" further than the R43T) The rest of the plug is identical in geometry/dimensions.

    I'm running a small dome 10:1 piston, with stock GM iron heads. Heads and block haven't been decked or milled down.

    Does anyone know off hand if I can run this extended tip plug or will the piston hit it?
    "I'd love to help you out wags, but there is larger issue concerning breast cup sizes on another thread that we have to work thru first. This subject suddenly became a non issue." - GN7

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  3. #2
    Some guy obnoxious001's Avatar
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    Quote Originally Posted by Bonzen View Post
    Have always ran the AC Delco R43T plugs. Now Autozone says they are unavailable now. They have a R43TS that has an extended tip (the post and electrode stick out about 1/16" further than the R43T) The rest of the plug is identical in geometry/dimensions.

    I'm running a small dome 10:1 piston, with stock GM iron heads. Heads and block haven't been decked or milled down.

    Does anyone know off hand if I can run this extended tip plug or will the piston hit it?
    The piston should not be close on a 10-1 engine. The extended tip may make slightly more power. If you look around on Ebay and such, the R43T is still available, in fact Summit has the MR43T marine version I believe. You could always cross reference it to an NGK.

  4. #3
    Off Road Badass Bonzen's Avatar
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    This is the piston I'm running. 23cc small dome. Click image for larger version. 

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    You say the extended tip plug might work better because its further into the chamber?
    "I'd love to help you out wags, but there is larger issue concerning breast cup sizes on another thread that we have to work thru first. This subject suddenly became a non issue." - GN7

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  6. #4
    Village Idiot fc-Pilot's Avatar
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    Quote Originally Posted by Bonzen View Post
    This is the piston I'm running. 23cc small dome. Click image for larger version. 

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    You say the extended tip plug might work better because its further into the chamber?
    Yes, being further in the camber helps to get the flame slightly more centered, and therefore a better burn. You might need a little less timing, so that is something that I might be aware of while running.

    Paul

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