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it helps to spray the valve keepers with carb cleaner to remove built up varnish, use the correct tool and method or you can damage the valve or retainer or not seat the valve stem locks correctly when re-assembling the spring/retainer group. its very easy to slightly bend a valve useing the (wack it with a socket method) because the valves head always hit the bench or floor at an angle when you wack it, and it is extremely difficult to correctly re-assemble the springs with without the correct tools. if your wacking the spring hard enought to knock the keepers loose your useing more than enought force to bend a valve
BTW if your removing the springs with the engine in the car, a compressor with an air fitting in the park plug hole set at 120psi keeps the valves shut and prevents them from falling into the cylinder (do only one cylinder at a time and make sure that the engines in gear, the wheels are chocked and brakes on , and the engines at TDC on the compression stroke before working on that cylinder), if you don,t have a compressor bring the cylinder to BDC and push 10 feet of 3/8" cotton rope into the cylinder, then BYE HAND TURN THAT CYLINDER TO TDC, the compressed rope will prevent the valves from falling into the cylinder be sure to tie a big knot in one end of that 10' rope so it can,t all slip into the cylinder
 
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