11373 .12 TZ(P)-T 3 PORT TURBO

Competitors come and go -- but champions keep on winning. For rock-solid dependability and title-taking performance, there's only one choice for the long run: O.S.

Designed for top-level racing and head-to-head competition with premium-priced engines.

Available in 3-port models for ROAR-legal racing — and a 5-port powerhouse for .12 open classes!

Virtually perfect bore-to-stroke "square" creates the broadest possible power band and the ability to harness it for bottom-end torque, top-end speed or any combination of the two.

Factory-milled and flared crankcase, crankshaft and ports smooth the flow of fuel, air and exhaust gasses, reducing power lost to turbulence and boosting performance.

"Teardrop" ribs inside the crankcase channel and compress fuel-air flow for added power and better burn.

CNC-machined A7075 aluminum piston and knife-edge conrod reduce rotational mass, improving efficiency and available power.

Hefty, 12 mm crankshaft is CNC-machined for tighter tolerances and minimum vibration

Also included: true ABC construction; enlarged rear and rubber-sealed front bearings; oversized, 1.92 in. (49 mm) 2-piece turbo head and P6 Turbo Plug.