David S. Wallens
David S. Wallens Editorial Director
12/8/11 10:12 a.m.
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Our 1984 Porsche 911 Carrera engine has gotten a bit closer to completion, as it now sports all 12 rocker arms. This step was fairly easy: insert a rocker arm onto the rocker shaft; insert assembly into cylinder head; place and tighten to spec.

We performed one small upgrade during this step, however, installing RSR-spec seals on each rocker arm shaft. These pieces add a soft seal to what was originally a metal-to-metal fit. In theory, these seals keep the oil from leaking past the rocker arm shaft and out of the cylinder head.

These seals were used on the 911 RSR (hence their nickname) but they have become a popular upgrade for all 911s built through 1994. The grooves that secure the seals are already present.

Next up, we need to adjust the valves, and since the engine is out of the car we're going to compare two popular methods: measuring the gap at the rocker arm, and checking the distance between the cam lobe and the follower.

We also ordered a few more parts: fresh engine mounts. A set of four cost us less than $95, and they should firm up things a bit. We went with the slightly stiffer Turbo/Cabriolet pieces, a popular upgrade.

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