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The large-journal connecting rods were thicker (heavier) and used 3 ⁄ 8 in (9.5 mm) diameter cap-bolts to replace the small-journal's 11/32. 1968 blocks were made in 2-bolt and 4-bolt versions with the 4-bolt center-three main caps each fastened by two additional bolts which were supported by the addition of thicker crankcase main-web bulkheads.
Work Completed: Crankcase ventilation system fixed by cleaning the oil screen and replacing the breather pipe that runs to the oil catch can to sort out blue exhaust smoke, clutch master and slave cylinders replaced to fix spongy clutch pedal and 1–2 gear crunch, interior woodwork on the dashboard top and doors replaced, leather seats ...
The 421.19 cu in (6.9 L) was introduced in 1961 as a dealer-installed Super Duty option for racing. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. The first of the "big journal" Pontiac V8s, it had a bore and stroke of 4 + 3 ⁄ 32 in × 4 in (104.0 mm × 101.6 mm) and came with dual four-barrel carburetors.
The 2CV's engine has a combined engine "breather" and oil filler assembly which contains a series of rubber reed valves. These allow positive pressure to escape the crankcase (to the engine air intake to be recirculated) but close when the pressure in the crankcase drops as the pistons move apart.