Edelbrock head valve spring assembly
I just can't see a little extra pressure(less installed height)on a mild lift cam being a problem.
I was thinking through all that last night, AJ, and may come to pretty much the same conclusion. Some quick calcs this AM shows that the standard springs that come on these heads are 327 lbs per inch, and a .030" change is 10 lbs increase in closed seat pressure from 120 to 130 lbs, and the same 10 lb change in open pressure. So agreed: should not be any real issue, IMO when the detaisl are examined. And, I can't see it adversely effecting the max advertised lift limit of .575".
BTW, the standard Edelbrock springs for this head bind at .670" from standard installed spring height; that will decrease, but should still not be a big issue since max lift limit advertised for these heads OOTB is .575". You would have to float the valves .060" or so over the max advertised lift limit to get to coil bind.... hence your comment on 'mild cam' .... which we don't know in the OP's case.
BTW, my theory
today on why our heads came without the cups, and only shims in the .030" to .050" range, is likely due to a factory machining situation. The installed spring heights are right on spec, so either the valve seats were not set deeply enough or the spring pockets not machined deeply enough to allow the .060" thick cups to be installed. Since the pockets can be referenced to the bottom head surface and 'ought' to be easy to get right, I tend to think the casting was such that the valve seats did not set in quite deeply enough. We noticed some core shift in the exhaust ports and have read another online comment in intake port core shift, so combustion chamber core shift is not out of the question.
Well, that is the theory..... and I feel it beats the Edelbrock theory that 'someone shipped the heads to a customer, the customer removed the cups, and then sent them back to the seller's warehouse' .....riiiight.
