Put them on SBC 350 and so far so good. Filling the oil pump delivered oil to all 16 on them. Make sure you have a deep thin wall socket to install. I had a thin wall and still had to use a vise to remove the bushing after tightening each rocker. I've tightened each rocker a half turn after zero cam failure and about 30 miles on a new build and so far so good. Make sure the small holes in the rocker arm are not clogged with grease or oil as this could cause problems lifting the pushrod and into the channel on the rocker arm. area in a cup. I also used Comp Cam's valve train assembly spray before installing the valve covers.
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