Had the opportunity to run the ported aluminum Mummert heads on the 312 dyno mule.  I was already in the process or running a variety of iron heads in a single day on the mule engine in preparation of the ‘Exhaust test to end all tests’ and did manage to sneak the ported aluminum heads into this test session. The ported aluminum heads were conveniently off of the EMC engine to make molds of the combustion chambers for a new domed piston design so it was just a matter of bolting them onto the mule for a quick three pull test.  Thanks to Randy Gummelt for spending the day in helping change out several sets of heads while doing the dyno testing.

The mule engine is the +060 over 312 with cast pistons that reside 0.025” in the hole and still retains the same Crower camshaft that’s been used in a multitude of other tests.  1.6:1 roller rockers are being used with Best Gasket head gaskets.  A stock Mummert intake with 750cfm Holley carb atop a 1” spacer is also being used.  377HP with the EMC headers and 368HP with the Sanderson headers.  Here’s the graph showing the ported Mummert aluminum heads on the dyno mule with both the Sanderson 1½” tube headers w/22” of 2½” collector extension/no mufflers and the EMC 1¾” stepped headers with mufflers.

Lorena, Texas (South of Waco)