I like the valley design a lot better than the Indy block for oil drain back...
An Indy block has no oil drainback to speak of. Your oil pan will go dry in less than 60 seconds after initial startup, then you can pull the motor back out of the car, completely tear it down and re-engineer the oiling system so it will work. I can't imagine how they stay in business. I don't want to be, and don't think I'm qualified to be, an oil system engineer. I want to buy a block that works. The Indy aluminum block might be the most unfunctioning part I've ever bought. And I buy a lot of parts.
Same thing just happened to me on our new Indy block. I just rebuilt the whole thing and still not sure if I fixed the problem. What a nightmare. Oil pressure is good for about 60 seconds and then starts dropping like a stone as soon as oil warms up. Talk about frustration.
