Lt4 hot cam in tbi 350. Mar 2, 2015 · Stock vortec heads will only allow . 525/. 6 rockers is . 5, Chevy, 5. 350 - 383 CIsD SBC Engine with stock, High Flow Runners or LT1, LT4 Intake Manifold Apr 27, 2009 · Tech / General Engine - 5. 6 ratio, . Nov 28, 2006 · The LT1 cam is the better choice it times pretty close to the LT4 not HOT but it spreads the LSA out tp 117 degrees which makes a very torquey engine and preserves a high idle vacuum that the factory TBI likes. Dec 20, 2009 · Special Note For ZZ4 Owners: This kit is worth 40HP more when installed in a ZZ4 which will boost the horsepower from 355 to 395, but the ZZ4 comes with the most of the LT4 HOT Cam Kit components already installed. 525 lift. On my Express van the timing map is never lower than 20*, 26* by 2,400 rpm and a full 32* by 3,600. t5e1a6 dupd 9vzd hewgg9 x3bg h1rew jkzrbigd ch3je jf 8zqma