This is a Level 2 Performance engine build on a 1967 912, purchased by the owner new in California. The car now has 325,000 original miles. We ported and flowed the intake and exhaust ports, along with the intake manifolds. The pistons were balanced, as well as the connecting rods end to end and performance valves were installed.
We first evaluated and disassembled the engine. This evaluation helps us to determine the extent of build needed and also enables us to address the owner’s build preferences. All components were cleaned, then fully evaluated, tested and measured. On this engine, the crankcase needed to be align bored and the camshaft, lifters, rockers and connecting rods were all in need of reconditioning. New genuine Mahle pistons and cylinders were needed. The cylinder heads were resurfaced. We ported and flowed the intake and exhaust ports and matched the intake manifolds to improve flow, efficiency and performance. The pistons were balanced, as well as the connecting rods end to end. All crankcase and crankshaft oil passage plugs were removed for proper cleaning of the oil passages. We then installed new plugs and micro polished the crankshaft. New valve guides were installed. All valve seats were cut on our Mira precision valve seat cutting machine from Switzerland. New performance valves were installed and valve lengths were set. New valve springs were pressure tested and spring heights were set. Deck height and compression ratio were checked and adjusted. All bearing clearances were checked and recorded. Upon assembly, we measured and recorded all fitment and clearance specifications. The fuel pump and carburetors were also rebuilt. All hardware was replated and engine tin was repaired and then powder coated.
After the build was completed, we properly broke in and set up the engine. Once we had 100 miles on the engine, we changed the oil and filter, took an oil sample, cut open the oil filter (to check for debris), re-adjusted the valves and went over the engine set up. The owner was given a maintenance interval protocol to follow for proper care of the engine during the remainder of the break-in period.
The transmission was fully disassembled, cleaned and checked. All worn, synchros, sliders, guide teeth, and bearings were replaced with factory Porsche parts as needed.
Below are galleries of the engine restoration and transmission build.
Engine Restoration
Transmission Build
