Verifying installed height and checking for coil bind would be a good thing to do especially with 1.6 ratio rockers and if you trim the seats. You can get cheapo height mics. from all the usual sources.
I think MRL was referring to LA heads as i just measured the guides and they are .530" in diameter and .372" from the spring seat to the top. Already measured current ret to seal is .540"
I would wait to buy seals until you know exactly what you are dealing with. Again, verify after the machining is done and then order the parts. Valve seals are not a big deal. Are you using aftermarket valves or factory? Do the springs specify a specific inside diameter?
Sounds like you are referring to valve lash? Magnums generally use hydraulic roller lifters though so let us know if you have switched to a solid roller. A hydraulic will have preload but no lash.
You generally follow the cam card for the valve lash specs. Once it's dialed, you can adjust somewhat to fine tune. Tighter valve lash can increase top end performance slightly and looser can have the effect of more torque. (I think that's how it works, could be backwards but you get the idea).
I appreciate all the help, still kinda new to the machine work side of engine building and want to make sure i cover all my basses and learn everything i can.
