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ive never noticed any difference in pressure. a lot depends on your bearing clearances and any oiling modifications done to the block and/or pump.

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Main's are.003 and the rod's are .0028 rod side clearance is .032 if I remember correct, all oiling passages have been opened up, crossover tube in the lifter valley and block tapped and modifyed at the oil filter area for remote filter.

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dartman366 i am going to do the mods to the block for the remote oil filter.i liked the photos you posted on that. what is the idea of the lifter tube mod. I have heard of it being done but never seen what it looks like or what it helps.is it related to rpm.i am running a 360 .040 over with solid cam.always looking for things that help it live longer. thanks Brad

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you block off the passage from the no. 1 main that go's up to the driver side galley and put the crossover tube in to feed that galley, help's to prevent oil starvation to the no. 1 main, if I get a chance I will try and find the pic that show's the tube I put in.