From what I recall the factory installed spring height on RA4 is just over 1.8”. It takes some adjustments on the spring height to run a 1.7” spring. The 1.7” springs like the 68405 and the 995 Comps work ok though, but it usually needs a -.050” valve lock and a shim to get the seat pressure where it needs to be, that varies when the valve retainers are swapped with aftermarket versions.
Last edited by Jay S; 05-22-2026 at 05:56 PM.
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