Hot Rod - - Pitstop -

One easy way to ID Olds en­gine dis­place­ments is by the block cast­ing num­bers and ID num­bers. We’ve listed mid-1970s-and-later 307-and-larger small-block Olds V8 cylin­der-blocks in this ta­ble. 330s were only made in the 1960s and to­day are very rare. 260 num­bers aren’t listed be­cause no one cares. Both ID and cast­ing Nos. must match; ID dig­its may have been used more than once for other dis­place­ments. De­sir­able “solid main web blocks” have full-thick­ness main webs for added strength.

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