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  •  » Cylinder head modification

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    6/29/2021 6:41 AM  #1

    Nos681
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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,333

    Cylinder head modification

    Has anyone ever modified older cylinder heads to use the smaller diameter spark plugs?

    I figure it would be similar to installing new seats for valves.

     

    6/29/2021 7:03 AM  #2

    RV6
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    From: Pine Junction, CO
    Registered: 3/01/2016
    Posts: 1,248

    Re: Cylinder head modification

    https://www.aircraftspruce.com/catalog/eppages/efis-sparkplug-07-19991-2.php

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
     

    6/29/2021 10:33 AM  #3

    rpm
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    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,656

    Re: Cylinder head modification

    Hmm... learn sumpin ever day.

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    6/29/2021 11:36 AM  #4

    Texas!
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    Registered: 6/27/2014
    Posts: 232

    Re: Cylinder head modification

    Why would you want to use the smaller plugs?

     

    6/29/2021 3:42 PM  #5

    Nos681
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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,333

    Re: Cylinder head modification

    I thought of having adapters to do that as well.

    The reason is for header flange clearance on older heads.
    Another reason is availability of different heat ranges as well as material construction of the spark plugs.

    I’ve never seen an article about modifying heads like this.

    Compare 13/16” and 5/8” spark plug sockets.

       •Thread Starter
     

    6/29/2021 8:10 PM  #6

    HudginJ3
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    From: Cedar Hill, TX
    Registered: 4/29/2015
    Posts: 1,249

    Re: Cylinder head modification

    It's commonly done on experimental airplanes using certified engines so they can use and experiment with plug heat ranges. They commonly experiment with ignition and fuel systems as well. 

    70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
     

     

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