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240 STYL »
https://forums.nicoclub.com/240-styl-u3534.html
Mon Dec 23, 2002 8:19 am
If it's at the front of the valve cover like it was w/my stock motor, you should try replacing the lifters and the valve springs. It worked for me. Too many high revs will weaken the valve-train. Causing a kind of clacking noise. Maybe this will help.