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Ford Racing Catalogue Web

ENGINE BUILDING TIPS AND SPECS ROLLER ROCKER ARMS POSITIVE-TYPE OIL SEALS VALVE PUSH RODS Light-weight aluminum roller rocker arms, Positive-type oil seals are recommended Hardened push rods are required on valve trains however, provide many advantages for continuous on OHV performance engines to prevent that use a guide plate (because they rub against high rpm operation. They’re mounted on needle oil |from running down the valve past the the plate). Do not use non-hardened push rods. bearings and feature a cylindrical roller that valve guide and into the combustion chamber Push rod length is important to maintain correct “rolls” over the valve tip to move it downward. and contaminating the air-fuel mixture. valve train geometry. The process of drilling an This reduces friction, heat and wear, and only The cylinder head must be machined as oil hole down the center removes some material requires about half the horsepower to operate illustrated to accept the oil seal. from the spherical ball at each end. Push rods the valve train. And valve train stability is greatly are described by “gauge” length (the distance increased. Roller rockers reduce valve stem wear between the ends before drilling the oil hole). and valve guide wear to an absolute minimum, The actual “measured” length is usually about because the roller doesn’t push the valve 0.025" shorter than the gauge length. from side to side as it is opened, as occurs with standard rocker arms, as they “slide” over the valve tip. Ford Racing offers roller rocker arms in several ratios for the Ford Racing V6, small block V8s and big block 429/460 V8s. VALVE SPRING RETAINERS AND KEEPERS Currently Ford Racing only offers retainers and single-lock groove keepers in a 7-degree design. They are compatible with all Ford Racing valve springs for the Ford Racing V6, small block V8s and big block 429/460 V8s. 10-degree retainers/keepers are available from aftermarket suppliers. Do not attempt to interchange 7-degree CAMSHAFT TIMING retainers with 10-degree keepers and vice versa. DEGREE WHEEL No camshaft installation is complete without Single-lock groove keepers are recommended checking camshaft timing events. Use a for high-performance engines. Production 351C timing degree wheel to check for correct (except BOSS and HO), 351M and 400 engines camshaft installation. use multi-groove keepers (to promote valve rotation). If you modify for any extended high- revving performance, replace the valves, retainers and keepers with a single-lock groove design. For important information about the proper usage of performance parts, please see page 14. 80 Techline (800) FORD788 See pages 286-292 for important safety, emissions and warranty information.


Ford Racing Catalogue Web
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