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Since the early 'sixties era of closed crankcase devices and the later carbureted engine emission controls era, owners have wondered whether to restore or eliminate devices. Aside from the legality issues, there are times when these devices have either little negative effect or may even provide some benefits. For those unaware, my answer to a Jeep CJ-7 owner's emissions modifications may help. I'd also add that Jeep pioneered the closed crankcase on the MB WWII model, and this equivalent to a PCV system eliminated the common road draft tube. An open road draft tube would have swamped these 134 L-head crankcases during stream crossings and beach landings. Often, emissions devices are neither bad nor detrimental to performance. In fact, they can even have positive effects as noted in my comments above... Moses
