Howards Max Effort Dual Racing Valve Springs - O.D.: 1.470", I.D.: .800" 21300MR-O 11 in Extended

11 in Extended

AFCO Multileafs are built with the same materials and craftsmanship as the popular AFCO Monoleafs

1958-1971 Plymouth Belvedere

CD Ignition Box

Howards Max Effort Dual Racing Valve Springs - O.D.: 1.470", I.D.: .800" 21300MR-O 11 in ExtendedCoiled and heat treated in the finest facilities available. Howards research and development teams are constantly updating materials and manufacturing techniques, to provide the best possible valve springs. Howards Cams pioneered many valve spring developments since the 1950's, and are still working with the best engineers and race teams to be on the cutting edge of valve spring technology. The name Howards Cams has been synonymous with high