LT1 DIRECT INJECTED FACTORY CYLINDER HEADS. CNC PORTED FOR GM LT1 6.2 BLOCKS. GM factory cast re-manufactured cylinder heads for the GM LT1 6.2L series. Engine block, these heads come assembled with a choice of three different valve configurations. Exhaust Valves, Manley Extreme Duty. Intake Valves, Manley Severe Duty/Pro Flo. New Manley Severe Duty/Pro Flo intake valves. New Manley Extreme Duty exhaust valves. New Manley Nextek Valve Springs. We are CBM Motorsports based out of Colton, CA, USA.. We specialize in racing and high performance LS engines and parts for off road vehicles, hot rods, muscle cars, drag cars, rock crawlers and watercraft. We manufacture and stock hundreds of specialty…