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My 70 LT-1 Short Block came stock with a windage tray. I also use a lifter valley baffle to keep hot oil off the bottom of the intake. Windage trays have proved their benefit for nearly 40 years in performance engine. It seems that maybe Crane is trying to cover "all the bases" for the poor cam blanks and lifters that are resulting in cam lobes being wiped out during break in. The LT-1 short block has been in my '62 Vette since 1973 and I have had zero problems. I had the heads and pan off last year while doing a frame replacement and the inside of the engine, including cam and lifters are still perfect after all the years.
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