Reply to "351C trouble."

Soul!... A couple of things come to mind: 1. Did you 'pre-lube' the Hydraulic lifters before installing them, by pumping oil in the side holes with and oil pumper can?. 2. Could you be adjusting the valves 360 Degrees 'OFF' from the 'True' Top Dead Center (both Cylinder #1 Valves are on the lobe 'heels'); So that you have started adjusting the valves on the TDC of the Exhaust stroke; which is incorrect? 3. I do not think it is correct to adjust the lash on Hydraulic lifters, While the engine is running, as with Mechanical Lifters. 4. On your 'Poly-Locks', you MUST tighten BOTH the Poly-Lock AND it's SET SCREW simultaniously!! Or they will never stay locked, and will back-off. 5. If you have lost the "Springy" feel in the lifters; they have either, NOT 'Pressurized' properly(see #1) or they have collapsed. 6. If you DID NOT completely cover the Cam and lifters with Moly-Disulfide or other 'Break-In' lube; and then run your Engine, on it's initial start-up, at 2500 RPM for at least 20 minutes; Then you have destroyed your cam lobes. Good-Luck with it! Regards, Marlin.