Originally Posted by rich970
what plugs for indy 440-1 with 15 to 1 comp. could i use ngk R5672A - 9 OR 10 or stay with the R5672A- 9 or 10 thanks Rich
Try the -9 and see how they work, if they fowl out easy, go to the -8
I'm not familiar with the indy heads as for what reach plug they take.