.they are the new king of the hill for ford enthusiasts cast from 355-t6 aluminum ... six bolt-per-cylinder matches man o war blocks available with 285cc or 275cc intake ... arm studs parallel at 10° offered bare or fully assembled part 023005 023005- ... -3 023012 023012-2 023012-3 application bare head assembled head assembled head ... assembled head bare head assembled head assembled head bare ... head assembled head assembled head bare head assembled head assembled head des ... -on power booster for stock or modified 302/351 fords cast from 355-t6 aluminum ... alloy standard ford 4 bolts-per-cylinder attachment ... with oem valve train components offered bare or fully assembled valve dimensions n/a ... 64cc 64cc 64cc 64cc man o war aluminum 302/351 ford cylinder heads 18° valve ...