My 470 stroker has been to 7000 na. With nos it’s been to 8000 many times. It was built in 1998. In 2013 it was checked over and the lifters and springs were changed. It had Comp 829s in it. Replaced them with the same lifters and the same comp springs. It had a 4 summers of street driving along with many track runs. The springs have over 700 at .625 lift. Kim
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