Pushrods and rocker arms

On a small block Ford, getting the right pushrod length is critical to engine longevity. since I changed the heads, I needed to re-check pushrod length.  I neglected to take pictures of a lot of the process but will try to explain it properly without them. I began by disassembling one of the hydraulic lifters and placing washers inside to simulate the lifter being in the pumped up position while the engine was running. Then I cut a stock pushrod in half, drilled and tapped it for a small threaded rod and made it's length adjustable. I could have purchased an adjustable pushrod but then I would have had to order it, pay $35 and wait several weeks for it to arrive.

Adjustable pushrod

I took a Sharpie and made the top of the valve stem black, then installed the pushrod and the roller rockers according to the manufacturers instructions. After turning the engine over four full rotations, a line would be worn in the Sharpie ink. By adjusting the length of the pushrod and repeating the process, I could determine what length I needed to get the rocker arm pushing down directly in the middle of the valve stem. Once I had that, I could measure the pushrod and order the length I needed.

I ordered these Manley 6.5" pushrods from Kens Kustom Machine

And installed all the pushrods and rockers per Comp Cams instructions.