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SAM/CH ZR-1 · 12-17-2016

I measured by a 1990 head the with stock cams and lifters the lifter pre-load and got 0.097". With stage 1 cams the pre-load drop to 0.051"and with stage 2 to 0.025". To make the lifters work properly a minimum pre-load of 0.040-0.070" is required otherwise you can loose valve opening duration and get a noisy valve train. The situation become worse with the shorter 93-95 MY valves.

12-17-2016	#6
SAM/CH ZR-1 Join Date: Jul 2005 Location: Basel/Switzerland Posts: 152	Re: Valve length I measured by a 1990 head the with stock cams and lifters the lifter pre-load and got 0.097". With stage 1 cams the pre-load drop to 0.051"and with stage 2 to 0.025". To make the lifters work properly a minimum pre-load of 0.040-0.070" is required otherwise you can loose valve opening duration and get a noisy valve train. The situation become worse with the shorter 93-95 MY valves. __________________ Sam DR.Z/LT5-Performance 1990 #1822 with 383 cui Last edited by SAM/CH ZR-1; 12-17-2016 at 02:00 PM.