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Have you checked your plungers and bores for scoring? The springs are pretty hardy and rarely go bad but it doesn't take much debris to scratch the sliding parts. I think a real big help would be putting in an oil pressure gauge. This would really be a big trouble shooting help. The GB pump cover is for high pressure protection. If a big, cold, thick surge of oil hits the output end of the cover it will also press against a ball, which is resting against a spring. This surge will press against the ball and since it's a good amount of pressure (~125psi or more) the spring will compress and some of this surge will pour into another bore which dumps back into the oil pump intake side. Thus, the oil will circulate within the pump and cover and no extra oil will be picked up from the pump. Oil still gets routed out the normal cover output as well since this opening is not blocked, but at a reduced pressure since there isn't as much oil passing through. As oil is circulated out of the cover it allows oil from the pick up to enter, thus supplying new oil into the circuit. This whole process occurs quickly and insures that there is always oil coming in and going out, but the output will be below 125psi. As the oil heats up (with engine temp) it becomes thinner and will not affect the over pressure circuit. Whew! Okay, with that in mind, I'm gonna take a guess here. It could very well be the pump cover because if debris gets in the over pressure circuit it can do one of two things: Either keep the ball from moving into the spring, thus defeating the over pressure relief, or keep the ball from moving completely *forward* after an over pressure event thus allowing oil to leak past. It's this second possibility that could be your problem. I will be talking with Clyde Berg tomorrow and I will ask him about the pump cover we have and get his input. So far, knock on headers, my cover has been working flawlessly. Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L '75 Porsche 914 1.8L, ORPCA member Portland, Oregon, http://www.geocities.com/MotorCity/8501/ >-----Original Message----- > O.k.--new theories, anyone? I've got a dual-relief case; any >probs with the relief plungers/springs? The Berg pump cover?