V4.0 BILLET CYLINDER HEAD
JDBB with long-ram manifold pictured above
The next generation in SMI billet heads is here! New and improved port design for maximum flow, this
velocity, and efficiency. Available with either long-ram or space saving tip-down billet intake manifolds, billet front or center-load plenum, and our all-new center load exhaust manifold. Comes with our original bullet-proof valvetrain and billet valve cover.
Available in JDBB, JDSB, and IH 400 series