At 1 time on this site, there was a person who wanted all the spark plug wires to be divided on each side of the motor, a crossfire cap was suggested but then, was said not to be known produced anymore well. I was looking through a Yearwood Speed and Custom catalog, that I picked up at a car show, and they have crossfire caps listed. they are only listed for Chevy tho. www.yearwood.com is the site.The company is located in Agusta Georgia.