the only thing on a cam on a 289-351 > there is a retainer plate that bolts to the block with 2 .25" bolts that holds the cam in. yes you need it cause if it aint there the only thing holding the cam i is the timing chain. the chain will hold it in but that puts added pressure on the chain which causes it to wear out quicker. there is also the possiblity of cam walk without. that plate needs to be there. the bolts that hold it in place have low profile heads. ford racing sells the plates and the parts. as for the Haynes manual showing a thrust plate , no a sb ford anit got one. BUT if your using a steel cam timing chain sprocket they come with a bronze washer thats installed between the sproket and the cam retainer plate. it keeps the hard steel gear from wearing the face of the reatiner down.
Last edited by supershifter2; 03-18-2012 at 05:44 PM.