- Jul 18, 2016
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Trying to tune and road test my '67 Mustang 289 V8, but for some reason, the POLYLOCKS KEEP COMING LOOSE, and not always on the same cylinder or bank -- sometimes left, other times, right. I'm confident the valve adjustment procedure and pre-load and zero lash have been done correctly (performed more than once so you tend to get good at these things. LOL!). Engine is a 289 +.030 has a fairly aggressive "street/strip" cam (290/228, .504 lift), Comp Cams Roller Tip "Rail Type" rockers AND using polylock nuts (some type from JEGS I bought years ago. YES, heads were machined for screw-in type studs, but no guideplates. Carb is EDB 1406, brand new out of box, and I've adjusted float level, etc.
I'm thinking of ordering a set of replacement STOCK TYPE rocker ball and nuts kits from Summit Racing. Am I just NOT cranking down the polylocks enough to keep damn rockers tight for more than a few starts? Just don't want to bend any pushrods or valves at this stage. Thanks for your input and shared experiences with this PITA issue.
I'm thinking of ordering a set of replacement STOCK TYPE rocker ball and nuts kits from Summit Racing. Am I just NOT cranking down the polylocks enough to keep damn rockers tight for more than a few starts? Just don't want to bend any pushrods or valves at this stage. Thanks for your input and shared experiences with this PITA issue.