I have to do a reset. Sorry for leading everyone down a dead-end path. After taking it all in, it didn't sit right with me that a head that was built specifically for hyd roller cams could have spring pressures so far removed from Hughes Engines' specs. Today I spoke with Jeff at TF and got the right answers. I was referencing the wrong spring p/n. In my defense, I was using the p/n that was at the top of the list of spring options that were included in the instructions. Turns out I was referencing a hyd FT spring. Never assume, always go straight to the source. For those who may be interested, the correct p/n is 16094-16.
The installed height is still 1.900". But the seat pressure is 150# and the spring rate is 427. Aligning with the cam card, spring pressure at .550 lift is 385# ((.550 x 427)+150); 40# greater than what's called out on the cam card. Rather have a little more than less spring pressure.
