The fiber & plastic cam gears were used to elimate the "noise factor" and are designed for that engine's 'normal' operating limits.

In commercial use or in Hot Rods you should use the aluminum ones as their stromger and last longer.

The 70s era SBC timing set (plastic)would die @ 70-90,000 miles where the 1960 version rarely failed long after 100,000. This too encouraged sales due to the SMOG restrictions then.

There often sold in sets which is to incourage installing both together with "unworn teeth" so they will run quietly.

They don't need to be from the same MFG, just unworn etc.


John M., I.I. #3370

"There are no shortcuts to any place worth going". -Anon