![]() ![]() however, 4k is not exactly high revs, and my head is not milled all that much. I did read somewhere on the interweb, source of all information, that noisy valvetrain at high revs can be caused by incorrect pushrod length, particularly with milled heads. I have them adusted as per specs with 1/2 turn beyond when you can no loner spin the pushrod with your fingers. These do fit kinda loose on their shafts in terms of end play, but not in terms of bearing play. Also, the engine is smooth and quiet and wonderful up to about 4k, then it gets noisy, so I don't believe the pushrods are hitting anything. ![]() I can only conclude that I have the right lifters. YELLA TERRA 1.80 Ratio Roller Tip Ultralite Rocker Arm Kit GM LS Kit P/N YT6670. Yella Terra Rockers are made in Australia to high. ![]() Also, there is plenty of oil in and around and on the valvetrain when I remove the cover. Yella Terra Rockers have proven themselves over the years in use, a high quality product doing a tough job and making it look easy. I have to assume they where the correct lifters, and the pushrods definitely had oil passages. I got the complete package from Classic Inlines which included lifters and pushrods.
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