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1.7 rockers will not work well with a cc503. The ramp rate, or how fast the lifter travels up the lobe will be intensified on the spring side with a higher ratio. The XE lobe is already fairly fast for the normal springs used with them. It can lead to spring failure and valve float if the springs are not up to the task.

Those rockers you are looking at are scary for that price. A stainless steel rocker set is in the $450 range from Comp or Crower. I would recommend these as a nice budget rocker arm -- Made in the USA

Scorpion Racing Products SCP1003 Scorpion Race Series Rocker Arms

The Comp Ultra Pro Mags are also very nice pieces for a bit more $..
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