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Spark plugs!!!

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Postma98 View Drop Down
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    Posted: 03-September-2017 at 10:28AM
Anyone know what spark plugs will fit my 429...i don't know why but the autolite APP-45 is too big in diameter. I need to know before tomorrow, as always thank you
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aquartlow View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote aquartlow Quote  Post ReplyReply Direct Link To This Post Posted: 03-September-2017 at 11:06AM
#45's (Autolite) are 18mm plugs, what cylinder heads are you using(casting # above center exhaust ports)? Autolite #3924's are a good # for the smaller 14mm plugs.
 Some 429-460 cylinder head casting number's using 18mm plugs
 Some 429-460 cylinder head casting numbers using 14mm plugs
Hope this helps.
BTW, check plug threads carefully, somebody may have installed "adapters" to the 18mm heads to allow for more plug choices in the 14mm size.
Just a thought.
If you do find that the 18mm plugs fit, try an NGK WR5, I have been real happy with these since switching from Autolite 45's. 

Edited by aquartlow - 03-September-2017 at 11:19AM
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