Technical Notes: Sold individually. #77929 heads are supplied with valves only; the valve guides and finish valve job are machined to accommodate the Edelbrock valves included. The customer must choose and install the correct valves springs, as suggested by their camshaft manufacturer. #77919 heads are sold bare and will require proper machining of the valve guides and a finish valve job for the specific valves the customer chooses to install. Due to the increased intake runner width, off-set intake rockers are required. The amount of offset will very depending on deck height, lifter type and cam-shaft base circle. Additionally before porting the Cylinder Head intake runner, fit the Cylinder Head to the block and verify push rod clearance to the Cylinder Head, at times the Cylinder Head push rod area may need to be relieved for appropriate clearance providing the correct off-set rocker is used. Before you begin this process you need to install the cam & lifters that will eventually be used in this engine. After the process has been completed you need to let your head porter know the push rod area of the intake port wall could be limited and care needs to be taken in this area so you don?t machine through the intake runner surface.

Flow Data tested @ 28" H20 (rated in CFM)

Valve Lift	.100"	.200"	.300"	.400"	.500"	.600"	.700"
Intake	85	150	211	261	298	322	325
Exhaust	63	118	160	189	207	219	226