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Ford Racing Catalogue Web

ENGINE BLOCKS Did you know… FR BOSS 302 FR BOSS 351 The BOSS 302 block features cylinder bores designed for stroker applications without additional clearancing. Durability tested up to 3.400" stroke, some racers have run as much as 3.500" stroke and 9.00 second E.T.s! STOCK 302 1969-1970 BOSS 302 FR BOSS 302 1971 BOSS 351 FR BOSS 351 9.2" FR BOSS 351 9.5" Main caps 2-bolt cast iron 4-bolt cast iron 4-bolt nodular iron 4-bolt cast iron 4-bolt nodular iron 4-bolt nodular iron (2,3,4) machined splayed machined splayed machined splayed (2,3,4) (2,3,4) (2,3,4) Siamese bore No No Yes with engineered No Yes with engineered Yes with engineered cross drilling cross drilling cross drilling (BB no cross drilling) Freeze plugs Press Screw in tapered Screw in Press Screw in Screw in pipe thread O-ring sealed O-ring sealed O-ring sealed straight thread straight thread straight thread Material Cast iron Cast iron Diesel-grade heat Cast iron Diesel-grade heat Diesel-grade heat treated cast iron treated cast iron treated cast iron Head bolts 7/16" 7/16" 1/2" 1/2" 1/2" 1/2" Recommended 4.030" 4.030" 4.125" 4.030" 4.125" 4.125" (BB 4.185 with max. bore sonic check) Front oil crossover No No Yes No Yes Yes for lifter galley Main bolts 7/16" 7/16" (all) 3/8" 1/2" (all) 3/8" 1/2" (all) 3/8" (all) 1/2" (all) 3/8" 1/2" (all) 3/8" outer (2,3,4) outer (2,3,4) outer (2,3,4) outer (2,3,4) Oil galley plugs Pipe thread Pipe thread Screw in Pipe thread Screw in Screw in and press in O-ring sealed and modified locking O-ring sealed O-ring sealed straight thread straight thread straight thread Hydraulic roller Yes No Yes No Yes Yes compatible Clutch cross No Yes Yes Yes Yes Yes shaft pivot hole Rear main seal 1-Piece 2-Piece 1-Piece 2-Piece 1-Piece 1-Piece CID capacity 347 347 363 408 427 454 (BB 468) For important information about the proper usage of performance parts, please see page 14. 98 Techline (800) FORD788 See pages 286-292 for important safety, emissions and warranty information.


Ford Racing Catalogue Web
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