rocker arm nuts breaking
#7
TECH Fanatic
iTrader: (4)
I had the same problem my engine builder called me after he was finishing up the build and he wasnt even putting much force to set the preload and they snapped. This was on a used set of pro mag style poly locks. Bought a new set and never looked back. I have the rest if you need two just pay for the shipping.
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#9
TECH Veteran
iTrader: (12)
I have broken at least three CC poly locks in the last year. The set screws were torqued to 25# IIRC and it appears they would just fail under normal driving. I got rid of them and went ARP perma-locks and have had no further issues but I did have to machine the tops of the perma-locks down to clear the composite valve covers.