E-street vs Promaxx vs 440 Source

PRH said
And then...... sometimes even heads that have been built at a shop.......have things screwed up.
Here’s a set of SBM RPM heads built from bare castings that someone sent me to look over.
Intake and exhaust valves not the same OAL..... along with also having a different tip length.
So, noticeable spread in tip height..... and an even a bigger spread in installed height.
Then there was also “that one spring”......

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I agree. I had a set of hardened seats w/new guides/valves installed in a pair of 906's. One head, every exhaust valve would show light around the valve with a flashlight down the port (half moon sliver), and alcohol poured out of it like a fountain. Took me 4 hours to get the valves to seal with my lapper.