CNC Ported GM 862/706 Casting

$1,399.00

CNC ported GM 862/706 Castings

227cc intake runner, 84cc exhaust runner

62cc chamber

Our stage 1 will use stock valves in the 2.0/1.55 size

sold in pairs

VALVE OPTIONS

SPRING OPTIONS

MILLING OPTION

Quantity

General Recommendations
Wilkes Performance assumes no responsibility for damage if the end user builds an engine without properly verifying he has enough piston to valve clearance (depth and radial clearance both checked). It is recommended for a minimum depth of .080″ on the intake valve and .100″ on the exhaust with a radial clearance of .030″ minimum around the perimeter of each valve. It is the customers responsibility to verify proper piston to valve clearance.
CNC Porting
On occasion a 100% CNC ported head might have casting areas left “as cast”.This is due to core shift and this in no way affects performance.
Disclaimer
Wilkes Performance assumes no responsibility for damage caused to engines from modifying OEM castings. These products are now classified as racing products. They retain oem valve seats, oem casting material. This cylinder head design and structure was made for oem power levels. End users now add tremendous horsepower over the oem level. This extra horsepower and added heat can cause casting failure. Wilkes Performance did not cause this from porting or valve jobbing an oem casting.

General Recommendations