When I checked it with just 16 degrees of mechanical timing I had only about 10 to 11 inches of steady vacuum and this cam is far from being a radical cam. All the valves are set correctly and there are no vacuum leaks and timing tab I verified myself when i installed my timing chain and tdc locater. My new cam only has about 41 degrees of overlap seat to seat timing and with a 112 lsa and short duration I figured I should have more. Ok now the part that surprised me when I put my vacuum gauge on and I got all of my timing and distributor curved at a 900 rpm idle I had a very steady reading of only 15 inches and I was guessing I would have around 18 or so? The overlap on that cam was about 66 degrees. Ok my old crane roller cam specs at 284/292 222/230 50 509/528 lift and it gave me about 14 to 15 inches at idle as with its overlap it kind of went back and forth between the two. Timing is set at 16 mechanical and with full manifold timing with vacuum advance is around 28-30 degrees. First off new engine specs, 350 sbc, world sportsman 2's, edelbrock eps intake, holley 600 vacuum secondary, 260/270 212,218 50 (custom hydraulic roller cam made after the lunati 60120 voodoo cam) 510/510 lift with a 106 center line with 112 LSA and is 6 degrees advanced. Hello guys well today I finally got my cam swap done and hooked up my vacuum gauge and was surprised at my reading.
