Comments by "mpetersen6" (@mpetersen6) on "GM LS - What makes it GREAT? ICONIC ENGINES #12" video.

  1. Let's be honest. Just how often do high RPM engines really get to wind out. Aside from sport bikes. Plus how often do they need to. In normal driving even on the highway frankly the need for high output does not happen very often. Don't misunderstand. I like this stuff too. There was a couple of things that GM tied but did not use. One was stacked camshafts. One for the intake. One for exhaust. One thing I think I would have tried Twin Cams. One for each cylinder block. Mount the cams high up along the bank and really shorten the valve train up
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  2. There have been factory development projects. Ford had a 4 valve head for the Windsor. Oldsmobile had 4 valve heads under development for their big block https://www.streetmusclemag.com/news/the-w43-oldsmobiles-dohc-455-v8-that-never-was/ The DOHC was a development of the 4 valve pushrod head. There have been aftermarket multi valve pushrod heads. Three and four valve. Perhaps the most well known is the Gurney Westlake three valve heads. Unfortunately bling won't find an image. The one below is for a Corvette motor https://www.corvetteactioncenter.com/specs/c6/corvette-ls7-engine/ls7-engine10.html One problem with 4 valve heads on a pushrod engine is pushrod clearance issues. Plus one pushrod opens two valves. Additionally the exhaust valves usually need a secondary pushrod between the idle rocker arm and the one that opens the valves.
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