A Sherlock Holmes needed to ID 340 springs - Aftermarket

toolmanmike said

I would agree. They list a dual spring for the E-4 which is a mild solid cam for the 273 with a 216°/.425 spec.

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Yes TMM, they do...The Z-30 Chev grind ("280 " as advertised.., 254 @ .050/."480" lift) doesn't really need a dual spring, with a damper. (340-350 ish open, as I recall). Not really needed..