A Manifold thread turns to Cams. I love it. Still have not installed my Isky but I know it will be monster. Was told this should not be annoying with 904 and 3:23s. Will benefit with more stall. The car is just so pleasant to drive as Chrysler intended I am waiting to swap when I can massage the heads. Stock 273-4 except Edelbrock Streetmaster 318, Electronic Ignition (no performance gain over dual point), New Edelbrock 500 cfm.