I wonder if there is some confusion about the letter designations of 'S' and 'T'.?
In 1971 there was some sharing of parts betweeen the 429's and the BOSS 429's. There were two BOSS 429 engines, the early ones that were designated 'T' engines and later production that were designated 'S' engines.
For example.. Camshafts; the Cobra Jet used the same cam shaft as the BOSS 429 'S' engine. and the Super Cobra Jet uses the same cam shaft as the BOSS 429 'T' engine.
The rev limiters were designed with the "T" and "S" cam shaft specs in mind since each one was capable of different RPM limitations.
Some of the old parts books just re-printed literature from previous years rather than re-writing the material. Hence you will find reference to "T" and "S" in the books for 1971, but it may be in reference to the two types of BOSS engines. :>)
Allen
Posted on Jul 26, 1999, 10:02 AM from IP address 161.184.17.109