PART NUMBER PACKAGE OF (16)	APPLICATIONS	DESCRIPTION			NOTES
		RATIO	MOUNTING	VALVE TYPE
M-6564-A351*	289/302/351W and Ford Racing aluminum cylinder heads M-6049-J302	1.60:1	Stud	Inline	Requires 3/8" stud, push rod guide plates & hardened push rods. Cast iron ylinder heads require pedestal machining.
M-6564-D351*		1.70:1	Stud	Inline
M-6564-K351*	289/302/351 Ford Racing aluminum cylinder head M-6049-Z304	1.60:1	Stud	Inline	Requires 7/16" stud, push rod guide plates & hardened push rods. Cast iron cylinder heads require pedestal machining.
M-6564-B351*1 2	302/351W - 1978 and later with production heads. Cast iron and aluminum GT-40 heads	1.60:1	Bolt On	Inline	For stock production cast iron cylinder heads with hydraulic non-adjustable valve train. Does not require guide plates, hardened push rods or pedestal machining. Includes pedestal inserts & bolts.
M-6564-A50*12	302/351W - 1978 and later with production heads. Cast iron and aluminum GT-40 heads	1.70:1	Bolt On	Inline		Same as "Cobra" 5.0L Mustang. These rocker arms have beefy trunnions for extra long life. Die cast aluminum construction.
M-6564-F351*	M-6049-N351/N352 "Sportsman" head. M-6049-Z304DA head	1.65:1	Stud	Inline	7/16" stud mount intake rocker with .150" offset pushrod cup (pkg. of 16).
M-6564-C351*	351C/351M/400 1973 and later 429/460 production cylinder heads.	1.73:1	Bolt On	Canted	For stock production canted valve cylinder heads with hydraulic non-adjustable valve train. Does not require guide plates, hardened push rods or pedestal machining. Includes pedestal inserts & bolts.
M-6564-A460*	351C/351M/400 302 BOSS/429/ 460,429 CJ/SCJ and Ford Racing high port aluminum cylinder heads.	1.73:1	Stud	Canted	For canted valve cylinder heads. Requires 7/16" stud, push rod guide plates, hardened push rods. Some cast iron cylinder heads require pedestal machining.


NOTES:

¹ The M-6564-B351 and -A50 bolt-on roller rocker arms will not clear the stamped rocker cover on standard 5.0L EFI engines. "Taller" valve covers, such as the production 5.0L EFI HO die-cast aluminum cover or Ford Racing chrome cover M-6582-D302, can be used if the baffle is modified in the RH cover. The M-6582-E302 polished aluminum valve cover will clear all rocker arms and stud girdles, but will not fit under the EFI manifold unless a 1" spacer M-9486-A53 is used between the upper and lower sections of the intake. M-6582-E302 will not fit 1994-95 Mustang or 1990-93 T-Bird.
² Rocker channels not included.