Reply to "OEM Appearing Alloy Cleveland Heads From Scott Cook"

January 12, 2011

The externally stock appearing aluminum cylinder head from Scott Cook Motorsports is one step closer to being ready for market. The head features "stuffed" 4V intake ports and high swirl combustion chambers. Some details have changed from Scott's original plans, so here's the latest run-down.

(1) CHI and AFD heads were designed around "stuffed 4V ports" and were constrained by 4V port architecture. Unlike those heads Scott Cook's head is a clean sheet design. The ports represent the best work of a pro-level port designer restrained only by the original 4V port locations at the manifold flanges and the original valve seat locations in the combustion chamber. Everything in-between is new.

(2) The intake port of Scott Cook's head is at 4V port height, which is raised approximately 1/2" higher in comparison to a 2V intake port like those of the Edelbrock and Trick Flow cylinder heads.

(3) Valve sizes have been finalized at 2.19" intake and 1.625" exhaust.

(4) There shall only be one intake port offered, with two possible combustion chambers. The standard combustion chamber shall be approximately 58cc - 64cc. A shallow chamber shall also be offered with a volume of approximately 40cc - 45cc. Intake port flow is on average 4% better with the shallow combustion chamber. Scott cannot measure the exact chamber volumes, port volumes, exhaust port flow, etc, until he has the heads in hand (they are en route from the US).

(5) Now for the exciting news! The out of the box flow specs for the CNC machined intake ports:

Valve Lift ... Standard Chamber ... Shallow Chamber

... 0.200" ........... 153.3 cfm ................ 158.0 cfm
... 0.300" ........... 215.9 cfm ................ 229.3 cfm
... 0.400" ........... 279.0 cfm ................ 293.9 cfm
... 0.500" ........... 325.7 cfm ................ 335.7 cfm
... 0.600" ........... 347.3 cfm ................ 356.5 cfm
... 0.700" ........... 352.9 cfm ................ 364.5 cfm
... 0.800" ........... 358.7 cfm ................ 372.5 cfm

(6) Since the ports and chambers shall be CNC machined Scott's customers are guaranteed their heads will match the advertised flow specs as closely as is possible, from cylinder to cylinder, right out of the box. Porting will not be necessary.

(7) There shall be no 4V port offered at this time; the 4V port will come at a later date.

-G