Designed for 1986-91 Tuned Port Injected (T.P.I) 5.7L small-block Chevy Corvette engines originally equipped with centerbolt valve covers, these Performer cylinder heads are available fully assembled and ready to bolt on or bare for use with your own valve train components. Features include high-quality stainless steel 2.02" intake and 1.60" exhaust valves, choice of 60cc combustion chambers and high flow 165cc intake and 65cc 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. These heads include adjustable rocker stud and guide plate set-up for use with adjustable rockers. The casting is manufactured of virgin A356 aluminum and heat treated to T6 spec for superior quality. An extra-thick 5/8" deck and Heli-coil threaded inserts offer improved durability. Performer centerbolt cylinder heads are 50-state Street legal and accept factory centerbolt valve covers. The intake bolt pattern utilizes the 1986-91 (straight) 90-degree angle on the two center bolts. Made in USA.

Item Code	EDE-608719
Vendor Name	Edelbrock
Product Type	Cylinder Head
Product Model	Performer
Application	1987-91 5.7L Corvettes (except LT1, LT4, LT5 Vettes) originally equipped with centerbolt valve covers and the early "straight" manifold pattern
Engine Family	CHEVROLET - Small Block
Material	Aluminum
Finish	Polished
Cylinder Head Style	Assembled
Combustion Chamber Volume (cc)	60cc
Intake Runner Volume (cc)	165cc
Exhaust Runner Volume (cc)	65cc
CNC Machined Combustion Chamber	No
CNC Machined Intake Runner	No
CNC Machined Exhaust Runner	No
Combustion Chamber Style	Standard
Intake Port Shape	Rectangular
Intake Port Location	Standard
Exhaust Port Location	Standard
Valves Included	Yes
Intake Valve Diameter (in)	2.020"
Exhaust Valve Diameter (in)	1.600"
Valve Springs Included	Yes
Maximum Valve Lift (in)	0.575"
Outside Diameter of Outer Spring (in)	1.460"
Retainers Included	Yes
Rocker Arm Studs Included	Yes
Rocker Arm Nuts Included	No
Rocker Arm Nut Thread Size	3/8"
Rocker Arms Included	No
Guideplates Included	Yes
Guideplate Pushrod Diameter (in)	5/16"
Accessory Holes Drilled	Yes
Valve Guides Included	Yes
Heat Crossover	Yes
Quantity	Sold individually.
Notes	50-state street legal.