Crank scrapers or plate...?

IQ52 said

Very true........

So we made a crank scraper and windage tray for the 357/340 in 1977. Made a few dyno runs, 595 HP. Dropped the pan and installed the scraper and windage tray, 610 HP. It was enough of a difference that Cale Yarborough was really pissed that he couldn't catch the 'ol #93 Dodge going down the back straight on the road course at Riverside Raceway in California.

2009, I spent 4 days building a crank scraper for the 451 stroker. It was part of the reason we made 136 HP more than the next closest engine the same size in the contest.

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There you go pishta. I appreciate that some guys drop their numbers out here for free. I just don't like doing it much, but I will say that my experience mirrors IQ's.

What I will say is most guys don't consider that what the displacement is above the cylinder, is the exact same displacement below the piston. Think about it....if you have 410 CID, you also have 410 cubic inches moving air around in the crank case! And it's not just air, it's air and oil. The small block crankcase was never designed to displace 400 plus cubic inches. I will not build a stroker without a crank scraper. I use and up and down scraper. That's why getting a pressure differential in the crank case is a big deal. Helps oil contro and ring seal.