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Been awhile since I been on here but wondering if these lifters are the same ones used on the LS1 based V8's?? I know our 3X00's lifters are shorter than the LS1 lifters so will not work. There are a set of Caddy Racing Lifters and are hydro lifters capable of sustained 8000+ rpm racing use. GM developed them for the caddy racing team and has been using them on all their racing engines. Any thoughts??