Rich, I don't remember, but in your poly build did you change any of the dimensions in your combustion chambers by machining the heads or the block? The plug #'s I reported would be for a stock 318. Paul L. '63 Sport Fury 440/727 http://www.1962to1965mopar.ornocar.org/ml-lennemann63.html Rich Kinsley wrote: > > > > Rich Kinsley '64 Dodge Polara 4dr 318poly w/goodies > > I've been looking for the spark plug type and number that Don D > recommended for the big blocks. It was a short lawn mower plug as I > recall. Maybe like Autolite 295???? ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.