Spark plugs!!!

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#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
C8SE
C8VE
C9VE
DOVE-C

 Some 429-460 cylinder head casting numbers using 14mm plugs
DOOE-R
D2OB-AB& D3AE-FA(POLICE INTERCEPTOR ENGINES)
D2VE
D3VE-A2A

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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aquartlow Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19-December-2011 Location: Summerfield, Fl Status: Offline Points: 2271	Post Options Post Reply Quote aquartlow Report Post Thanks(0) Quote Reply Topic: Spark plugs!!! 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 C8SE C8VE C9VE DOVE-C Some 429-460 cylinder head casting numbers using 14mm plugs DOOE-R D2OB-AB& D3AE-FA(POLICE INTERCEPTOR ENGINES) D2VE D3VE-A2A 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
	www.supermotors.net/22468 Yeah, It's a Hybrid...It burns gas and tires. No matter how good she looks, somebody, somewhere, is tired of her sh*t. Beauty is skin deep, ugliness goes clear to the bone.

Postma98 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 25-March-2017 Location: Logandale, NV Status: Offline Points: 51	Post Options Post Reply Quote Postma98 Report Post Thanks(0) Quote Reply 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