455 plugs

i have r45 a/c plugs but with 12-1 comp and iron heads dont i need r43's
can anyone suggest a good plug to run?and a source for them.

 

FINE TUNING BY PLUGS TAKES PATIENCE AND GOOD RECORD KEEPING ALSO SOME SPECIAL TOOLS (OTOSCOPE) TO LOOK DOWN DEEP IN THE PORCELAIN. GOOD LUCK
http://www.4secondsflat.com/Spark_plug_reading.html

 

R45 should be gasketed plugs, i beleive you need R45TS for the tapered seat.

You can choose to get them shorter (i beleive the T stands for extended tip) but you need tapered seat.

 

I have 12.5 to 1 comp also with Iron heads, and use r43ts Delco plugs, have been using them since 2000 in the race car.

 

thanks 4 the replies,i picked up a set of ngk's for 30.00 hope they work
ken

 

You made the right choice going with NGK.