** Eight Port cylinder head ( 4 intake port / 4 exhaust ports ) & IEEIIEEI valve order for 1980 ( California only ) and 1981 ( 50 states )
** Eight Port cylinder head ( 4 intake port / 4 exhaust ports ) & EIEIIEIE valve order from 1982 to end of CVCC production ( 1985 )
** Eight Port cylinder head ( 4 intake port / 4 exhaust ports ) & IEEIIEEI valve order for 1980 ( California only ) and 1981 ( 50 states )
** Eight Port cylinder head ( 4 intake port / 4 exhaust ports ) & EIEIIEIE valve order from 1982 to end of CVCC production ( 1985 )
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