When the shop rebuilt the heads they put .029" spacers under all of the springs. When I measure the installed spring height (without the spacer), I'm getting 1.86" with calipers. From what I've read, this is the bottom of spec.

I put a dial indicator on the cam to check lift and got .288". With the rocker ratio being 1.5:1, that should give me .432" max lift.

I put one of my springs in a vice and compressed it until it was almost bound up. That measurement was 1.325".

If you take the installed spring height 1.86" and subtract the max lift .432" that gives you a compressed spring height of 1.428". If you subtract the spacer they had in there you get a new compressed spring height of 1.399". Is that enough extra room to keep from messing something up? It's only about .074"? Do I need to have a spacer on the spring seat at all?