Thank you for explaining, I am going to ask the machine shop to make room for 1.65’s since they are already machining the head but plan on running stock factory 1.5’s to start. So then it sounds like I need to source a set of Ferrea valves with an overall length of 5.095 & ask the machine shop to machine the spring pockets as necessary for height & no bind? What about retainers & locks for those valves?
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