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those are crate motor heads manufactured from 69 to 72..109 cc, closed chamber.....large or small sparkplugs rectangular port according to mortec...hope this helps
Seeing as how Chevy was selling the LS-6 "crates" into the late '70's you will find these "291" heads cast up into the mid '70's timeframe, possibly even later. Chevy needed a continous supply of both head's and block's to keep the (aftermarket) assemblies flowing "over-the-counter"!
Thanks, Gary in N.Y.
P.S. I have 4 brand new "291's", in the boxes, with some K-17-75 date codes!
Seeing as how Chevy was selling the LS-6 "crates" into the late '70's you will find these "291" heads cast up into the mid '70's timeframe, possibly even later. Chevy needed a continous supply of both head's and block's to keep the (aftermarket) assemblies flowing "over-the-counter"!
Thanks, Gary in N.Y.
P.S. I have 4 brand new "291's", in the boxes, with some K-17-75 date codes!
Gary, the 291 's you have NIB are they bare heads or complete? Just curious if mine are NOS complete heads? or did they sell them as complete?