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Message: <blockquote data-quote="modo" data-source="post: 819444" data-attributes="member: 11716">k code was the hi-po 289. cleveland heads were on the original boss 302 <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />you also have 2v heads and the 4v which is my memory is still good were r,m and q.... there are aftermarket C heads these days which are better. the C heads have canted valves and depending on which version you have they are hemi-sperical combustion chambers or more of a quench design. they were performance based. you can mate C heads to a W block. use to be coined, clevor motor... all cool stuff but serve a purpose.i have a friend who has a 408 C stroker motor. NA through a 4 speed it made well over 600</blockquote>