There is one spark plug for the hardcore blown alcohol & nitro racer...the NGK 6061-10 and 11 V-Power spark plug. This is the true side gapped, cad plated, easy to read plug that is the standard for all of the winners in NHRA and NTPA as well as the variious Pro Mod catagories. These are a 14mm 3/4" reach spark plug that is normally close to 6.00 each. Well for a limited time, while supplies last, you can buy them in lots of 50 for 4.39 a plug...cheaper than anyone else has them. And we ship WORLDWIDE.