Custom Pushrods / Preload

Hi Guys,

next step in my engine build is to measure / order pushrods for it. Can you tell me some good vendors for these?

For the lifter preload: i use hydraulic rollers (factory ones, LA Roller cam block). I want to measure the length of the pushrod when it´s at the cam´s base circle, how much should i add to preload the lifters correctly?

Thanks for Info!

Michael