I'm very tempted to remove the pump again and clip a coil off the spring. This was due to the load of the oil pump on the distributor and camshaft and the reduced windage in the oil pan. ![]() Now here is the fun part: The horsepower jumped from 441 to 448 just from reducing the pressure by approximately 10 psi. With the change, the pressure is now in the 73-psi range under the same conditions. Well, we promptly removed the pump and put the production late-model Corvette pressure-relief spring back in the pump. ![]() This was with a stock-volume 31/44-inch pick-up and production pump. ![]() As I was looking over the dyno sheets, I noticed that the oil pressure was hitting 82 psi at the peak rpm of 6,600 with 200-degree-F 10W-30 Castrol. Well, when we ran the engine in and set the timing at a very conservative 28 degrees total, the engine produced 441 hp through 211/42 dual exhaust! I was very pleased for an engine this mild to produce that kind of power, and have over 15 inches idle vacuum at 750 rpm. The only simple mod that the oiling system had was the installation of a 70-psi white pressure-relief spring from the 302 Z28 and 350 LT-1 engines. I'm a firm believer in the stock oiling system of a small-block.
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