Performer RPM E-Tec cylinder heads feature an LT1-style raised runner intake port design for increased air-flow and ultimate performance. Available in 170cc or 200cc runner size, they both feature high-quality stainless steel intake and exhaust valves, 64cc combustion chambers and high flow intake and exhaust ports. The high-velocity Intake and exhaust runners are hand blended in the bowl area and the intake entries and exhaust exits are cnc profiled for increased air-flow. A unique combustion chamber design positions the spark plug closer to the centre of the cylinder, promoting uniform atomisation of the air/fuel mixture for more efficient combustion resulting in more power. These heads include adjustable rocker stud and guide plate set-up for use with adjustable rockers or washers to properly position the stud height to te factory style self-aligning rocker arms. The casting is manufactured of A356 aluminium and heat treated to T6 spec for superior quality. An extra-thick 5/8" deck and Heli-coil threaded inserts offer improved durability. RPM E-Tec heads are dual-drilled to accept 1987-95 centerbolt and/or 1986 & prior flange mount valve covers. RPM E-Tec cylinder heads are available fully assembled and ready to bolt on or bare for use with your own valve train components.

Performer RPM E-Tec 200 cylinder heads have all of the same great features as our E-Tec 170 heads, but feature a 200cc intake port and 80cc exhaust port for maximum flow. These heads outflow other aluminium heads of a similar design by 10% on the intake and 17% on the exhaust, making power up to 6500 rpm. The 64cc chambers produce 10.2:1 compression with flat-top pistons in 350-inch engines.

• Requires the use of hardened push rods.
• To use stock stamped steel rockers on small-block Chevy heads, +.100" longer than stock are required.
• Small-block Chevy heads may not be used on engines with less than a 4.00" bore except with camshafts with less than .450" valve lift.
• Vortec

Product Reviews for ED60989 - EDELBROCK