Hello All. Here is the problem. My engine pasues or hesitates when I mash the gas to the floor. After the hesitation it then gets up and goes. I have checked and adjusted the timing to 6BTDC as specified in a Chiltons repair manual. The idle is set correctly and I have no issues when starting the car. Even after the car warms up the pause or hesitation continues. No smoke and no leaks. I recently put some Crane Posi Stop lock nuts on to keep the Rocker Arms nuts from backing off. This has been a reocurring problem having to readjust them when the rocer arms begin to tap or make noise. When readjusting the valves I adjusted them as Crane reccomends by turning the engine in the normal direction of rotation until the exhaust pushrod starts to move up, then adjust the intake valve to zero lash with no preload, then between 1/2 to 1 turn more. Then turn the engine over again until the intake opens completely and then is almost all the way back down then set the Exhaust to zero lash. The specs are as follows... 350 4 Bolt bored .030, Forged .030 over Speed Pro Pistons, Crane Hydraulic CAM and lifters Cam is 480 int 494 exh grind h-228/3200-2s-6 operation range is 2800 to 6500 RPM's part number is 110591, Edelbrock Tranchula Single Plane Intake, Holley 670 Street Avenger, Turbo 350 tranny with heavy sprags and clutches (mild kit) plus transmission cooler, 3500 TCI stall converter, 2 1/2" Exhaust with balance chamber and 40 Series Flowmasters, and 12 bolt limited slip rear with 410 gears. Any help with this problem will be greatly appreciated.