Cushman Motorsports

These Trick Flow® Ultra 18 250 cylinder heads can make serious horsepower—power ideal for high-rpm circle track or super class drag racing. Dyno-testing proves it a 406 cubic inch, 12:1 compression small block with out-of-the-box Ultra 18 250 heads produced 730 peak horsepower at 7,500 rpm and 545 ft.-lbs. of peak torque at 6,000 rpm. The heads deliver high airflow numbers 334 cfm intake/256 cfm exhaust right out of the box. Trick Flow® Ultra 18® 250 cylinder heads feature 56cc CNC-profiled combustion chambers, Fast As Cast 250cc raised intake and 100cc exhaust runners, ductile iron intake and hard bronze exhaust valve seats, and manganese bronze valve guides. The bare castings are machined for 2.150 in./1.600 in. valves (and can accept valves up to 2.200 in./1.625 in.) and 1.640 in. valve springs. Assembled heads feature 2.150 in./1.600 in. stainless steel valves, 1.550 in. dual valve springs, and 10 degree retainers and locks. These Trick Flow® Ultra 18® 250 heads accept most current 18 degree intake manifolds (including two-piece manifolds), headers, and other components. These heads require the use of offset shaft mount rocker arms and a mechanical roller camshaft with offset intake lifters. Bare cylinder head castings are also available.