f-12 plug length

wacp · Feb 19, 2011

A couple of days ago I posted about the type of plugs to use in my 1938 f-12, the overwhelming responce seemed to autolite 7033. When i went to change them I compared them to the old plugs, the autolites where at least 1/8" longer than the originals. Im not sure what the plugs that are in it are you cant tell. Im measuring fron the threads to where it sparks, do you think that these longer plugs will be ok to use.

thaks any help is very appreciated

36F30 · Feb 19, 2011

Lots of space in that low compression combustion chamber, don't think you will have any trouble.

J.J. from Afton · Feb 20, 2011

Yep as said by F30 youll be fine, I use 3077s in my F12 too, I was worried at first but they fit fine and work great. Otherwise for reassurance just put the new plugs in and slowly turn engine over with spark off to make sure all of the pistons pass TDC freely.

-Jordan

f-12 plug length

wacp

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36F30

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J.J. from Afton

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