The customer may choose to specify a smaller exhaust valve and slightly larger intake valve (2.180") without adversely affecting the head's performance. The head includes as standard 45 degree valve seats. Flow numbers can be greatly enhanced, in particular the exhaust flow, with a 55 degree exhaust valve seat, combined with a 50 degree intake valve seat. Weld Tech gives the customer the option of either valve job. The amount of actual performance increase on the dyno will vary from one engine combination to another.

Note: Due to the deep bowl of this head, intake valve spring seats must not be lowered at all!

The exhaust port design is relatively straightforward with the exception of a fairly large bowl and a large venturi. Both act to further enhance the performance of the engine, but do not necessarily increase flow numbers.

The chamber design is considered a heavily unshrouded chamber, providing good low-lift wet and dry airflow. The chamber design should require relatively conservative ignition advance (31-32 deg.).

Camshaft recommendations for Winston Cup/ARCA competition are standard cookbook 272 at 50/280 at 50 with 108 degree lobe center spread. 1.75 Intake/1.65 Exhaust rockers are recommended. The customer may, depending on their engine combination, be able to use as much as 4 degrees more exhaust duration and/or 4 degrees less intake duration to increase torque and horsepower.