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These heads require 5 day lead time for machine work
"Get the most out of your Vortec Heads" - You asked and Pace performance listened... We are proud to offer a cast-iron Vortec cylinder head that will accommodate up to a .550" lift camshaft. We start with a "Brand new" #12558060 Vortec head pull the pressed-in studs and drill and tap them for a 3/8" screw-in stud. Next we machine the head and install a set of 1.379" diameter GM Performance springs and clearance the valve guides for clearances up to .550" gross lift. * Brand New Casting * 64cc Combustion Chamber * 1.94" intake valve/ 1.50" exhaust valve (valves included) * Set-up for 3/8" screw-in studs * Will accommodate up to .550" lift
*Straight Spark Plugs*
Steam holes are also drilled, for use on 400 blocks.
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