![]() ![]() Unbelievably the roller chain has a very interesting history. What makes the timing chain design possible is the type of chain – a roller chain. Therefore, after a second tear down I got it right. The marks have to line up exactly as shown with the correct cylinder being on top dead center.Įven though I was a novice mechanic at that time, I knew that backfiring through the carburetor could not be good. Close is not good enough when setting up valve timing. Lesson learned, take extra care when lining up the timing marks as shown in the illustration below. I learned a valuable lesson after installing a cam, a new timing chain and fresh valve job on the heads. Fuel economy was not a consideration, while speed and power was. Larry wanted to put a performance camshaft in the already powerful engine before installing it in the ‘57. I had my own tools and could work on cars during my auto mechanic classes. In those days, I was considered to be the resident mechanic within my circle of friends. ![]() The 327 had quickly earned the nickname “Mighty Mouse” for its small block power. He had managed to get his hands on a 327 CID engine, which GM™ released in 1962 to take on Ford’s 289 CID. Larry, a friend of mine, owned a ‘57 Chevy Bel Air, which had come standard with a 283 CID engine. It started in the mid-70s at the vocational school where I was studying auto mechanics. Personally, timing chains have caused me headaches over my entire career. The nylon design reduced longevity, not noise. How long could plastic gears possibly hold up? The answer turned out to be not very long. The first time I saw the gear design that used nylon teeth timing gear I had a bit of a headache trying to understand the thought process behind that idea. If the question was more specific such as, “are timing chains still causing headaches on certain engines? Ford™ engines? GM™ engines? BMW™? Audi™?,” the answer might be more specific, citing known issues, TSBs or recalls, on makes, models, certain engine designs and certain timing chain and gear designs. ![]() It also varies, depending on what OEMs (original equipment manufacturers) the question might be referring to. The answer varies greatly depending on whom you ask. ![]()
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