Yes, I've seen those. The plastic one is junk for sure. And, you still have to add on measurement to the exiting ones taken, not to count how many times you will be rotating the engine over to get the pushrod set right. How is that better ?
http://www.compcams.com/Technical/FA...inGeometry.asp
Verifying Pushrod Length And Rocker Arm Geometry
They come in two different designs, the more expensive of the two being easier to measure (once you have it adjusted to the proper length for your valve train).
Other companies offer their own versions of pushrod length checking devices, funny little plastic things and such with a sheet of complicated instructions to calculate the length. The main disadvantage with these is that you have to order the pushrods and receive them before you know if your calculations are correct.
You telling me a 18.00 dial indicator with base from Harbor freight is to expensive ?
I use my method, because no matter what the rocker ratio is, I can quickly check it in one revolution of the motor.
Notice you measure at midlift.