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WE RECOMMEND USING 200149 HD VALVE SPRINGS AS THEY HAVE THE LEAST CHANCE OF TOTAL COLLAPS,, OR IN OTHER WORDS BOTTOMING OUT COIL TO COIL. THE OUTTER SPRING IS 30MM TALL THE INNER SPRING IS 29MM TALL LIFAN 90 110 120 and 125 HEADS DON'T NEED THESE AS THEY ARE DIFFERENT AND ARE GOOD AS IS FOR THE HIGH LIFT CAMS...

ALSO WORK TO REPLACE STOCK 50 AND 70 STOCK SPRINGS AND ADD SOME MORE TENSION

@ e HEAVY_DUTY VALVE_SPRINGS WITH_WIDER COIL_SPACING FOR_HI_LIFT_CAMS IN_50_70_HEADS (GREAT_STOCK_REPLACMENT) (S1129) S1129