D-Port Exhaust Heads For Pontiacs

Can A Pontiac V-8 Designed In The '50s And Obsolete Since The Late '70s Benefit From Modern Cylinder-Head Technology? Find Out As We Test . . .

Photography by John McGann, Terry McGean

We flow-tested both the iron Pontiac heads and KREs on the same Superflow 600 flowbench at Westech used to test all CC's heads.

AIRFLOW CHART
VALVE	IRON 7K3		KRE ALUMINUM
OPENING	INT	EXT	INT	EXT
0.050	38	24	33	26
0.100	80	51	67	55
0.200	143	96	148	100
0.300	180	125	198	134
0.400	201	142	227	154
0.500	211	162	235	170
0.600	215	168	236	180
0.700	219	171	234	183
*Intake and exhaust results are in cfm.

'If for some reason you want a set of 7K3 heads, JMS has another pair.

SOURCES
Corteco Gaskets Milan OH corteco-na.com	Kauffman Racing Equipment 740-599-5000 www.krepower.com
Denso	Lucas Oil Products Corona CA N/A www.lucasoil.com
Demon Carburetion Dahlonega Ge 7-06/-864-8544 barrygrant.com	MSD Ignition El Paso TX 9-15/-857-5200 msdignition.com
Edelbrock Dept. 5.0 2700 California St. Torrance CA 90503 310-781-2222 www.edelbrock.com	Summit Racing Equipment P.O. Box 909 Akron OH 44309
H-O Enterprises Rancho Cucamonga CA hoenterprises.com	Westech Performance Group 11098 Venture Dr., Unit C Mira Loma CA 91752 9-09/-685-4767 www.westechperformance.com
JMS Racing Engines 6-26/-357-2718