ENGINE BUILDING TIPS AND SPECS ROCKER STUD COMPARISON …AND IF YOU HAVE 302/351 TO INSTALL ON WINDSOR-TYPE FORD RACING ALUMINUM HEADS a140 BLOCK (289/302/302 BOSS/351W) These heads come with a tapped .75" pipe 1. Install pipe plug in hole. Finish so it doesn’t thread hole in the combustion face, but no hole protrude above head face. in the intake manifold face. 2. Drill a 0.800" diameter hole in the intake face as shown or use the .75" pipe thread If your application requires external water Press-in stud with adjustable rocker nut. external water outlet valve provided in the outlets, see diagram below. NOT recommended with mechanical camshafts. front and rear ends of Ford Racing heads produced after July 1984. USAGE: Standard 289 and 1968 302. Press-in positive stop stud. Cannot be adjusted to set lash with mechanical camshaft. USAGE: 1969-1976 302/351W. TO INSTALL ON CLEVELAND-TYPE BLOCK (351C/351M/400) 1. Requires no special head work. Screw-in, positive stop stud. NOTE:a140 Heads produced after 6/1/1985 do not have .75" pipe threads at front and rear of head face USAGE: 1968-1972 429 with hydraulic camshaft. and must be drilled and tapped as shown in illustration. HEAD MODIFICATION FOR MECHANICAL CAM Pedestal-type cylinder heads for hydraulic cams can be modified to accept a mechanical cam (351C/351M/400 shown). Machine at right Screw-in, adjustable stud. Required for angles to the existing hole—not the bottom mechanical camshaft (and hydraulic with of the head. The valves operate at compound anti-pump-up lifters). angles. With 302/351W type pedestals, measure from the top of the pedestal. USAGE: 289 Hi-Performance, 302 BOSS, 351C BOSS and HO and 429 CJ/SCJ. All 302/351W .230" CYLINDER HEAD WATER All 351C/351M/400 .300" PASSAGE MODIFICATION 1973-1995 429/460 .300" As described on this page, cylinder heads for 1968-1972 429/460 .230" 351C/351M/400 engines have a water outlet passage in the combustion face, whereas 289/302/351W heads have a water outlet passage in the intake manifold face of the head. Heads can be interchanged, if provision is made for appropriate water passages. TO INSTALL CLEVELAND- TYPE HEADS (351C/351M/400) ON A WINDSOR-TYPE BLOCK (289/302/302 BOSS/351W) 1. Drill a 0.800" diameter hole in the intake manifold face of the head as illustrated. 2. Plug square hole in cylinder head. Install heads with Cleveland-type head gasket. 3. Use intake manifold gasket to match intake manifold. NOTE: If BOSS-type heads (302 or 351C) are used in either procedure, remember they have larger rounded ports than 1 2 3 4 conventional heads; thus a unique BOSS- Changing rod length or piston compression Use of crank with longer stroke Re-located Shorter rod.piston pin.and stock rods results in stockCrank throw times two equals stroke. type intake manifold gasket is required. height only changes where stroke occurs in piston being above top of block. cylinder bore— not length of stroke. Requires rod or new piston compression height. For important information about the proper usage of performance parts, please see page 14. 82 Techline (800) FORD788 See pages 286-292 for important safety, emissions and warranty information.
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