cam core plug
Originally Posted by BOSS 429
from the fact the bottom went in, but..we always install the cup side in, to many aftermarket cams have rubbed the cup when put in the other way,plus it lets a little more oil back there,,,, so install cup in,and push till even with block face, done.....
The above statement is incorrect. I, personally, have never had a camshaft contact a correctly installed core plug, nor have I seen or used an 'expansion plug' (as opposed to a 'cup plug') on a 429/460 engine.
A 'cup type' core plug is designed to be installed with the flanged edge facing outward (toward flexplate). This is because the maximum diameter of a cup plug is at the outer (sealing) edge/lip of the flange. It's imperative to install a cup plug into it's machined bore using the proper tool; it's not meant to be installed with a tool that contacts the flange. A cup plug is correctly installed when the flanged edge/lip is just beyond the chamfered edge of the bore/tunnel.
Conversely, an 'expansion type' core plug is designed to be installed with the flanged edge facing inward (toward camshaft). This is because the maximum diameter of an expansion plug is at the base/bend of the flange (with the flange flaring inward). It's also imperative to install an expansion plug into it's machined bore using the proper tool; it's not meant to be installed with a flat tool that contacts the crowned portion of the plug. The tool should push on the outer circumference of the expansion plug during installation. An expansion plug is correctly installed when the maximum diameter of the plug is just beyond the chamfered edge of the bore/tunnel.
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