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Ford Small Block V8 Tech Tips & Notes

1962-1987 221-255 (4.2L) ­ 260-289-302 (5.0L) cu.in. V8 and 1988-1995 302 (5.0L) cu.in. V8 trucks (except 1982-1995 302 (5.0L) H.O.)

Ford's modern line of small block V8 engines was introduced in 1962, with the 221 and 260 cu.in. versions. This engine family (properly referred to as the Windsor, even if it isn't the 351 cu.in. variety) has inline lifter bores in the block, and cylinder heads with inline valves equipped with 1.6:1 ratio rocker arms. The firing order is 1-5-4-2-6-3-7-8. These engines are designated by Crane's 36 prefix. We offer hydraulic, hydraulic roller (retrofit and OE style), mechanical, and mechanical roller camshafts for them. A wide-ranging line of valve train components is also available. The 1962 and 1963 cylinder heads have 5/16" diameter valve stems (different valve spring retainers, valve locks, and valve stem seals required), while the 1964 and later engines have 11/32" valve stems. From 1962 to 1965, the rocker arm studs were a straight 3/8" diameter adjustable configuration. In 1966, bottleneck 3/8 ­ 5/16" rocker arm studs were installed, resulting in a non-adjustable configuration. The exception would be the HiPo 289 engines, offered through 1967, which had mechanical lifter camshafts, and retained the adjustable style straight 3/8" studs. Our 99768-16 positive locking nuts will permit valve adjustment on the bottleneck stud applications. In 1977, a net lash pedestal mount rocker arm system was installed, continuing with the remainder of production through 1995. These pedestal mount rocker cylinder heads can be easily converted to an adjustable configuration for hydraulic and hydraulic roller street applications by using our Pushrod Guideplate Conversion Kits. Part number 36655-16 provides for 3/8" stud mounted adjustable rocker arms, and 36656-16 is for 7/16" stud mounted rocker arms. No machining is necessary, and your standard pushrods can be maintained, thanks to the composite bushing inserts in the pushrod guideplates. For mechanical and mechanical roller applications, we advise the heads be machined for screw-in rocker arm studs and pushrod guideplates. The production and aftermarket cylinder heads for the Windsor and Cleveland families all have the same valve layout, with the exception of the Gurney-Weslake pieces. If you are fortunate to have a set of these, we can custom produce a roller camshaft having the proper lobe layout. Most 1985-1987 302, all 1988-97 302 passenger car, and all 1996-2000 302 truck engines are equipped with hydraulic roller camshafts and lifters. The firing order of 1-5-4-2-6-3-78 is maintained for these applications. Conventional hydraulic, mechanical, and roller lifter camshafts can be installed in these engines if the appropriate kit components are used. The 1985-95 302 H.O. engines, although closely related, have a different firing order, and are discussed later on this page.

1969-1970 Boss 302 V8

Specifically developed for the Trans Am road racing series, the Boss 302 had canted valve "Cleveland" style cylinder heads installed on the 302 block. Since these heads have large ports and valves, and are intended for constant high RPM usage, a street driven application should have a relatively mild camshaft installed to enhance the torque and drivability. Rocker arm studs are a straight 7/16" diameter, with adjustable 1.73:1 ratio rocker arms required for the factory installed mechanical lifter camshaft. Although the valves are staggered, the same length pushrods are used for the intake and exhaust. Due to the Boss heads' different valve spring requirements, and the increased rocker ratio, this engine is designated by Crane's 27 prefix (even though the camshaft is physically the same as the 36 prefix). We offer hydraulic, retrofit hydraulic roller, mechanical, and mechanical roller camshafts for them. An extensive line of valve train components is also available.

CAMSHAFTS

1985-1995 5.0L (302) H.O. V8

Although closely related to the standard 302, the 1985-95 5.0L H.O. are equipped with hydraulic roller lifters, with camshafts having a firing order of 1-3-7-2-6-5-4-8 (the same as the 351 Windsor). Our 44 prefix designates these engines. The camshafts are dimensionally the same as the 36 prefix, with the different firing order constituting the primary change. Camshafts can be interchanged, providing the necessary changes are performed for the proper firing order. We offer hydraulic, hydraulic roller, mechanical, and mechanical roller camshafts. A wide-ranging line of valve train components is also available. The standard pedestal mount rocker cylinder heads can be easily converted to an adjustable configuration for hydraulic and hydraulic roller street applications by using our Pushrod Guideplate Conversion Kits. Part number 3665516 provides for 3/8" stud mounted adjustable rocker arms, and 36656-16 is for 7/16" stud mounted rocker arms. No machining is necessary, and your standard pushrods can be maintained, thanks to the composite bushing inserts in the pushrod guideplates. For mechanical and mechanical roller applications, we advise the heads be machined for screw-in rocker arm studs and pushrod guideplates. 1993-1995 SVT Cobra 5.0 Mustangs were factory equipped with aluminum needle bearing roller tip 1.7:1 pedestal mount rocker arms. These are our 44746-16, designed for basic bolt-on installation, but make sure to check for adequate spring travel due to the increased valve lifts when installing on other engines.

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1969-1993 351 (5.8L) cu.in. Windsor and 19821984 302 (5.0L) cu.in. H.O., also 1994-1997 351W, and 302 SVO/351 SVO V8

Another derivative in the Windsor family, the 351 engine blocks incorporate 1.3" taller deck heights to accommodate the increased displacement. Lifter bores are still inline, as are the valves in the cylinder heads, and the 1.6:1 rocker arm ratio is retained. Most notably, the firing order was changed to 1-3-7-2-6-5-4-8. Our 44 prefix designates these engines. The camshafts are dimensionally the same as the 36 prefix, with the different firing order being the primary change. Camshafts can be interchanged, providing the necessary changes are performed for the proper firing order. Additionally, the 1982-1984 302 H.O. engines also were equipped with hydraulic lifter camshafts having this revised firing order. We offer hydraulic, hydraulic roller (retrofit and OE style), mechanical, and mechanical roller camshafts and a wideranging line of valve train components for these engines. From 1969 to 1976, bottleneck 3/8 ­ 5/16" rocker arm studs were installed in the cylinder heads, resulting in a nonadjustable configuration. Our 99768-16 positive locking nuts will permit valve adjustment for these applications. In 1977, a net lash pedestal mount rocker arm system was installed, continuing for the remainder of production through 1997. These pedestal mount rocker cylinder heads can be easily converted to an adjustable configuration for hydraulic and hydraulic roller street applications by using our Pushrod Guideplate Conversion Kits. Part number 36655-16 provides for 3/8" stud mounted adjustable rocker arms, and 36656-16 is for 7/16" stud mounted rocker arms. No machining is necessary, and your standard pushrods can be maintained, thanks to the composite bushing inserts in the pushrod guideplates. For mechanical and mechanical roller applications, we advise the heads be machined for screw-in rocker arm studs and pushrod guideplates.

1970-1982 351C-Boss 351-351M-400 cu.in. V8

The Ford 335 engine family (commonly called the "Cleveland") shared cylinder bore spacing dimensions, and the head bolt pattern with the Windsor engines, but few other parts are interchangeable. The inline lifter bores were retained, but they are at a different bank angle from the Windsor. Cam bearing sizes are also different, as are the distributor gear dimensions. The valves in the cylinder heads are canted (staggered), but the same length pushrods are used for the intake and exhaust valves. The rocker arm ratio is 1.73:1. These engines are designated by Crane's 52 prefix. We offer hydraulic, retrofit hydraulic roller, mechanical, and mechanical roller camshafts for them. A wide-ranging line of valve train components is also available. The pedestal mount rocker cylinder heads can be easily converted to an adjustable configuration for hydraulic and hydraulic roller street applications by using our Pushrod Guideplate Conversion Kits. Part number 52655-16 provides for adjustable configuration 7/16" stud mounted rocker arms. No machining is necessary, and your standard pushrods can be maintained, thanks to the composite bushing inserts in the pushrod guideplates. For mechanical and mechanical roller applications, we advise the heads be machined for screw-in rocker arm studs and pushrod guideplates. The 1971 Boss 351 and 1972 351C H.O. featured cylinder heads with straight 7/16" rocker arm studs and pushrod guideplates, required for the mechanical lifter camshafts that were standard equipment. The Fontana Clevor block also uses our 52 prefix camshafts, not the 36 or 44 prefix Windsor style items. There can be a possible misapplication of components when choosing the proper retainers and valve stem locks for these engines. Although the valve stems are all 11/32" diameter, the configuration of the valve locks were changed. Note the following explanation to insure that the proper components are being used: 1970-1977 351C-351M-400 - Intake and exhaust valves use multiple groove valve stem locks, having a large outside diameter, requiring the use of 3/8" type valve spring retainers. 1971 Boss 351 / 1972 351C H.O. - Intake and exhaust valves use standard single groove valve stem locks, requiring the use of 11/32" valve spring retainers. 1978 351M-400 - The intake valves use multiple groove valve stem locks, having a large outside diameter, requiring the use of 3/8" type valve spring retainers. The exhaust valves use standard single groove valve stem locks, requiring the use of 11/32" valve spring retainers. 1979-1982 351M-400 - Intake and exhaust valves use standard single groove valve stem locks, requiring the use of 11/32" valve spring retainers.

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