Have comp 918 springs
614-16 +.050 locks
795-16 retainers
4705-16 seats
I read where that should put me at 1.75 install height and I’m at 1.875. What am I doing wrong?

 

How many miles on the engine? Could be worn valve/valve seats. You might need to shim them. If the heads have had machine work, they might have worked the spring seats a little. Have a look a this.....


Hopefully others can chime in with more experience than I.

 

The micrometer I was using wouldn’t work with the beehives.

 

See my questions above......if the micrometer won't work, buy one that will. No time to cheap out on tools.

 

918 spring height spec is 1.800" installed height. If your cam is stock or not a much higher lift than stock you "likely" are OK installing them tighter at 1.75" but that will increase its open & seat pressure and bring it closer to coil bind if you run a high lift cam

beyond that 918's have a horrible record of breaking. If you can, IMHO, return them and get the plug & play Lunati LT1 kit.

If you are intent on running the 918's than check them every 5-10k mi and consider replacing them after 20k mi

If you have a stock cam and install them at 1.800" they can be OK

this was after 18k mi