spark plugs for 466 with 14 to 1 comp

Hi guys I am looking for a spark plug heat range for my 466 14 to 1 drag car. It has iron cobra jet heads and flat tappet cam and I am looking for an NGK plug heat range number. I use 110 octane in this and the plugs in it now are very old autolite's. I just got it running for this year and it seems to have a little miss so gotta start somewhere.

57ford custom wrote:Hi guys I am looking for a spark plug heat range for my 466 14 to 1 drag car. It has iron cobra jet heads and flat tappet cam and I am looking for an NGK plug heat range number. I use 110 octane in this and the plugs in it now are very old autolite's. I just got it running for this year and it seems to have a little miss so gotta start somewhere.

IF it is kept below 180 degrees, A 7 or 8 depending upon if it is driving or racing.

which one is the coldest the A7 or A8

The 8 is colder on NGK plugs. The colder the better with 14-1 on 110 octane.

Thank you I will order a set tomorrow and start with number 8's

I'm guessing if his operating temp gets above 180 he would need an even colder heat range?

My local Autozone is no help so far.