I do agree 3/8 is fine for what you are doing Randy. But I did take mine to 1/2" since my brother has the right tools at his machine shop and my block looked fine for the mod. As long as it is done right it cant hurt at all and I dont mind feeling good about my oiling system and I have just got used to doing my blocks that look good. We started it years ago on my brothers low deck 400 block with B1 heads that he built back about 20 years ago. He twisted it pretty good and it ran 8.90's in his 2600 lb Cuda with a single carb on all motor. So we have just got used to doing it for extra precation. But I agree the 3/8 works fine for most bigblocks until it gets real serious. Ron