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if you are considering the LT1 cam + rockers i woudl suggest jsut looking for a stock LT4 cam since the resulting specs woudl be about the same. higher ratio rockers put a bunch of extra strain on the rocker studs and shorten the service life.
i don't know if anyone has done a side by side dyno comparison of stock vs LT1 cam, but it should be a sizable improvement over stock.
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