I don't like using checking springs when I'm checking P/V clearance or checking geometry. I think it skews the results significantly.
Morel does not offer a checking lifter, but you have a few options:
1. Use a solid roller lifter. You can order one single lifter, such as a Comp 838-1 to check.
2. Make something that fits on the top of the Morel lifter so that the plunger does not move.
3. Order a single pair of Morel lifters and modify it so that the plunger will not move.
Keep in mind that you can use whatever you want when you're checking P/V clearance or checking geometry. However, when you go to measure pushrod length, everything needs to be in the same configuration as it will be when the engine will be running. So, make sure that you're using the Morel hydraulic roller lifter with no modifications.
When you check pushrod length, make sure the lifter you're working on is on the heel of the lobe. If you're not familiar with the EVO method, I can explain it. That will insure that the lifter is on the heel. Don't rely on the TDC method.
Don't forget to include lifter preload.
*Ideally* with T&D rockers, you want to end up with the adjuster somewhere around one turn in from all the way out. If you read their instructions, there's an oil passage in the adjuster and if you go outside of the limits, you can block off oil flow.
