BBC rectangular port cylinder head casting numbers Number Engine Size Year Combustion Chambers 3856208 396 1965 Closed chamber 3904391 396 and 427 1965-1967 Closed chamber 3919840 396 and 427 1965-1969 Closed chamber 3964291 396, 402, and 427 1965-1970 Closed chamber 3964292 454 1970 Closed ...
A number of crate motors made by GM in Mexico, may have an "M" or "ML" prefix stamped into the front pad of the block followed by a series of numbers which serialize that particular crate replacement motor. You may also see a raised casting on the block or heads of "Hecho en ...
Though not exactly a special edition, both the Chalet and especially the Casa Grande were extremely rare. Approximately 1,780 Chevy Blazer Chalets have been produced between April 1976 and January 1977, while the GMC Jimmy Casa Grande numbers were considerably lower. Both campers were practically i...