Granatelli Motorsports now offers in-house porting for late model Modular two valve heads - so you have another choice for CNC Head Porting.
They are offered in four different stages:
• Stage One – General Clean up of intake and exhaust ports.
• Stage Two- Intake turn, bowl work with blended intake and exhaust ports. Flow rate is 205 CFM on the intake and 183 on the exhaust.
• Stage Three- Even more port work on the intake and exhaust. Valve sizing is increased. 232 CFM on the intake and 195 CFM on the exhaust.
• Stage Four- Combustion chamber welded up for increased compression. Intake turn has epoxies on the intake runner for a straighter direction on air flow, bronze valve guides, and largest valve size on a 3.552. Flows 268 CFM on the intake and 218 CFM on the exhaust. Compression ratio is bumped to 11:1 on a stock short block. Undercut intake and exhaust valves allow for stage two cam.
Check out more of their parts at: http://www.granatellimotorsports.com
