if i need a shorter spark plug for headers what can you recommend, i am currently using autolite AP605, but 2 are too long for headers. please help

6720 ngk

Call NGK tech support tell them you have a .679 reach 14mm tapered seat plug. Tell them you need a "header" plug. That being said be sure your using the right plug now as that one would never even find its way near my lawnmower.

Thanks for reaching out! Please contact our customer service department and they will be able to assist and answer your questions: https://help.summitracing.com/app/contactus/