Complete crate engine, fully assembled. Features high-flow cylinder heads with premium valves, valve seats, guides, springs, and seals. Intake and exhaust valves are +1 mm oversized and 0.030" longer than stock for improved valve train geometry. Includes 0.605" lift valve springs, gear-drive cam, high-strength alloy cylinder heads, enlarged cooling passages, S&S exclusive breather boxes, forged pistons, S&S Performance oil pump and cam support plate, premium valve tappets, billet aluminum covers, and sprocket shaft spacer. Crankcase features dual-spray piston cooling jets and precision-machined oil scraper. Made in the U.S.A.