Howards Max Effort„¢ Dual Racing Valve Springs - 1.437" O.D. - .800" I.D. Fittings & Hoses 50-inch bolt circle using a

50-inch bolt circle using a C4 automatic transmission

which add a solid

t feel like climbing Mount Everest

The lower air box retains your factory ram air scoop which provides constant cool air and keeps warm engine air out for maximum performance

1967-1967 Plymouth Belvedere II

Howards Max Effort„¢ Dual Racing Valve Springs - 1.437" O.D. - .800" I.D. Fittings & Hoses 50-inch bolt circle using aEngineered for racing use, springs are precisely coiled and undergo precision heat treating. Sold in sets of 16. The name Howards Cams has been synonymous with high performance camshafts since the 1950s. Howards Cams have always used on track experience to design the most powerful designs. This includes early Top Fuel favorites driven by Jack Chrisman and Larry Dixon Sr. Today we have even a greater group of experienced racers in Circle Track, Drag