An update to the older Z head, the Ford Performance Parts M-6049-Z2 competition cylinder head is now available via Marken Performance for more power. It has a 63cc combustion chamber and added velocity vane yielding 500+ horsepower.  Applications include small-block engines 289/302/351Windsor.  The head is equipped with 2.050 inch stainless steel intake valves and 1.600 inch 23-8N stainless exhaust valves, respectively.  One of the biggest differences between the Z2 new head and older Z head is the location of the exhaust port flange.  The new Z2 head has the exhaust flange in the stock location.  The Z2 also utilizes the stock exhaust bolt pattern (2.00”). The exhaust ports seal with standard Fel-Pro 1415 exhaust gaskets.  These heads accept straight rocker arms making choice of rocker ratio more expansive. 

   The unique “velocity vane” intake port was tested on a 363 cubic inch (302 based) crate engine.  The findings revealed that on a 363 inch engine the velocity vane was worth 3-7 horsepower from 4500-6500 rpm vs. the same port without the vane.