Rockers and rocker shafts 340

pt70 said

Those springs look like they are too large. The diameter of a stock 340 spring is ~1.500''. The diameter of the stock retainer is 1.375".

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So I brought one of the springs and retainers to work with me today. The spring OD was 1.48", while the retainer was 1.33". That seems to be correct. Shim under the spring was 0.0625", or 1/16"