Car Information:
Chevy Chevelle
Year: 1965
Engine Size:
Trans:

Issue / Question:
Larry, I have a ’65 Chevelle with a big block 396 motor. I took it to another shop to make some changes, (replace pan, transmission and drive shaft, and cam and lifters). All went pretty smoothly, I did most of the engine disassemble and reassembly but the crew pulled the drive train and reinstalled it. He was supposed to do all of the final adjustments etc. The problem is the valve lifters, they apparently don’t want to adjust. The cam and kit were new and came from comp cams. When I set them on the engine stand, I took them to zero lash when the cam was at the bottom and turned them 1/2 turn extra. They say that when they started the engine, the valves clattered very much and when he tries to turn them tighter the engine stalls. I have rebuilt several engines and he says he has done 1000. He wants me to come over tomorrow and be prepared to buy a new set of lifters and a new manifold gasket. He wanted the lifters soaked in oil before installation (they are hydraulics). Do you have any ideas?

Answer:
Wow – 16 bad hydraulic lifters from Competition Cam’s! I’m not buying it!
If the lifters won’t quiet down there most likely not getting enough oil pressure. Now what could we have done to lessen the oil pressure to the lifters while changing the cam shaft? We may have knocked a cam bearing out of its bore now we have a massive oil volume and pressure loss in the lifter galley! Since you were going to pull the intake go ahead and pull the timing cover again but before you pull the cam shaft back out remove one of the oil galley plugs and blow compressed air into it normal leakage will be expected but if it blows out around one of the cam bearing areas unrestricted that means the motor is coming out and apart to install new cam bearings. Hey I hope I’m wrong but I cant think of anything else you could have done. Good luck! and give me an update.

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