Custom Harley Davidson Evo Engine - TP Rocker Arms

With the rocker flipped upside down, you get a good look at the roller portion of the assembly. For lubrication purposes, oil flows out of the forged arm and is deposited on the roller, helping to maintain a long life.
With the rocker flipped upside down, you get a good look at the roller portion of the asse
At the other end of the roller, you can see a dimple where the pushrod will seat. The hole in the center of the dimple is designed to carry oil from the pushrod along the internals of the rocker on its way to the tip of the roller.
At the other end of the roller, you can see a dimple where the pushrod will seat. The hole
Tolerances between the rocker arm and the stanchion were held very tightly, leading to a good fit between the two parts.
Tolerances between the rocker arm and the stanchion were held very tightly, leading to a g

Just a little wiggling of the rocker was all that was needed to fit the rocker shaft in place. Photo No. 6 shows a notch ground into the shaft. This notch lines up with one of the mounting holes in the bottom box.
Just a little wiggling of the rocker was all that was needed to fit the rocker shaft in pl
5/16 x 2-1/2-inch mounting bolts pass through the notch, securing it in place.
TP machines the rocker shafts with a threaded hole in the end. This hole makes removal of the shaft a snap by threading in a bolt and pulling on it.
TP machines the rocker shafts with a threaded hole in the end. This hole makes removal of

After installing the O-ring gasket in the bottom box and the die-cut gasket in the top box, Eric set the rocker-box top in place.
After installing the O-ring gasket in the bottom box and the die-cut gasket in the top box
It was then secured by four 1/4-inch flathead screws.
This is one of the two pairs of the Andrews Products EV80 EZ-Install pushrods.

By making the pushrods adjustable, they can be collapsed completely, inserted in place, and then extended to the proper length.
By making the pushrods adjustable, they can be collapsed completely, inserted in place, an
Here's a good look at the components of the AB Tech pushrod cover. We will be reusing the stock inner pushrod tube (dull-gray piece), spring, and spring washer.
Here's a good look at the components of the AB Tech pushrod cover. We will be reusing the
Once assembled, the AB Tech piece will look ike this, with the stock pieces stashed inside.
Once assembled, the AB Tech piece will look ike this, with the stock pieces stashed inside

With the rear cylinder intake pushrod installed, Eric placed the exhaust pushrod in place before adjusting it.
With the rear cylinder intake pushrod installed, Eric placed the exhaust pushrod in place
While pushrod adjustment is certainly not rocket science, it is best to consult with the instructions shipped with your pushrods. Better yet, keep an eye out for an upcoming article on that very subject.
While pushrod adjustment is certainly not rocket science, it is best to consult with the i
Now, that's one sweet-looking motor. If we did our homework properly, it should run as nice as it looks. Check back next month as we install the charging system.
Now, that's one sweet-looking motor. If we did our homework properly, it should run as nic