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 when i foolishly ordered my heads thru ICH i asked them to be machined for 1.625 spring cups, "you don't need them" was their answer," you can do everything with a 1.550 spring". ok i'll go with that so i asked them to be machined for 1.550 cups, "you don't need them, spring locators are much better", well they were wrong & i experianced exactly what you posted. first time the heads came off i had them machined for cups & lowered the cup seat position 0.040 so i could go for 2" installed if i needed. those spring locator shims were shyte.
If they cast about 1/8 inch more material around the spring seats it wouldn't be a problem with 1.550 springs. I would imagine if you machined them for 1.625 springs it would also take care of it because it would clean off those thin spots that are just about guaranteed to chip and flake off due to the spring harmonics.
67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174
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