Performer RPM with 64cc combustion chamber Performer RPM with straight plugs (64cc combustion chamber)

Performer RPM Small-Block Chevy
Designed for 302, 327, 350 and 400 cid small-block Chevy engines up to 1986, these Performer RPM 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 64cc or 70cc combustion chambers and high flow 185cc intake and 65cc exhaust ports. 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 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 RPM cylinder heads are available with straight or angled spark plug configuration to fit a variety of exhaust applications. Made in USA.

Combustion chamber volume	64cc & 70cc
Intake runner volume	185cc
Exhaust runner volume	65cc
Intake valve diameter	2.02"
Exhaust valve diameter	1.60"
Valve stem diameter	11/32"
Valve guides	Manganese bronze
Deck thickness	5/8"
Valve spring diameter	1.46"
Valve spring maximum lift	0.575"
Rocker stud	3/8"
Guideplate	Hardened steel
Pushrod diameter	5/16"
Valve angle	23°
Exhaust port location	Stock
Spark plug fitment	14mm x 3/4 reach, gasket seat
Made In	USA

Technical Notes: Sold individually. Requires the use of hardened push rods. Bare heads will have valve guides and seats installed, but will require final sizing and valve job to match the valves you will be using. To use stock stamped steel rockers on small-block Chevy heads, +.100" longer than stock Edelbrock pushrods #9629 or equivalent 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.

Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O

#60899 | #60909 | #60999
Valve Lift	.100"	.200"	.300"	.400"	.500"	.600"	.700"
Intake	66	129	188	228	240	241	-
Exhaust	55	98	131	152	162	168	-