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Yes, tensioner is Mopar Performance part. http://www.forabodiesonly.com/mopar/showthread.php?t=136340

here is one article to study, there are many more. http://www.moparmusclemagazine.com/techarticles/engine/mopp_0001_360_engine_head_porting/

look at the 318 head porting post at the top of this forum "small block tech". Also, there is an article from one of the mopar magazines about magnum head porting. Blending the intake bowl....for street use they say the bowl diameter should be around 85-88% of intake valve diameter based on...