Re: Packard V8 Engine Size

Posted by Jack Vines On 2008/7/18 12:33:27

The Packard V8 OEM pistons have steel struts cast into the side of the pin bosses to insure even circumferential expansion. Thus, the Shop Manual instructs they be fitted at .0005"-.0015" piston-to-cylinder-wall clearance.

Egge Machine pistons are simple permanent-mold slugs of cast aluminum. They do not have the expansion control feature, thus need to be fitted at .003"-.0035" or they will scuff, overheat and otherwise give a bad account of themselves. Some of the sets I received in the past have been substantially heavier than the OEM pistons, thus necessitating rebalancing the engine.

thnx, jack vines