Light checker springs or your combo's actual springs? For determining the right pushrod length, each has its pros and cons. Gee, Kenny. I don't know. It depends how cute the spring is. (Groan.) ...

This may feel like specialist information, but for serious engine builders and home mechanics with a project themselves, checking the pushrod length may be a pain in the neck, but it’s worth doing.

Correct valvetrain geometry is critical to ensure trouble-free operation of an engine, especially during high-rpm operation. When building a new engine, many people simply reuse the original pushrods ...