Here are some more spark plug numbers for a stock Y.

Autolite: 46

Motorcraft: SP430 or SP431

AC Delco: R83TS

Denso: MA20PR-U or 5013

Lorena, Texas (South of Waco)

Tom, here is a link to spark plug recommendations on John's site. I used it after installing a mild cam and milled G heads on my 312. Ended up using  RF-11C Champions and have been happy so far.

http://www.ford-y-block.com/tuneup.htm

1956 Fairlane Victoria (ORREO)

 

Overlooking Beautiful Rimrock AZ

Just finished my 292 and I don't have a clue what kind of plugs to use.  It is a 292 bored to +.040 with a B intake and and headers and a little bigger cam.  What are the new part numbers for Y Block plugs?

tom in iowa

54 Merc wagon

54 sunvalley