Weights from some web page:
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engine -- weight -- pounds -- ref. -- comments

Ford flathead V8 525 (124) 1932 model, integral b'hsg, iron heads
Ford flathead V8 569 (1) ('53 239 CID)
Ford Cosworth DFV 353 (2) (racing engine, DOHC, 3.0L)
Ford 255 Windsor 468 (4)
Ford 289/302 V8 460 (168) (late 5.0s are a bit lighter)
Ford 221-302W 460 (48)
Ford Indy 255 pushrod 360 (120) all aluminum, 1963
Ford Indy 255 DOHC 400 (120) 1964, later known as Foyt Coyote V8
Ford 5.0 V8 450 (109)
Ford 5.0 V8 411 (171) 89 Mustang 5.0 GT (dry) inc: manifold,
carb(?), headers and alternator. Not
inc: starter, smog pump, power steering
pump, AC compressor, flywheel
Ford BOSS 302 500 (48)
Ford 351 Cleveland 550 (48) (includes BOSS and Australian 302-C)
Ford 351 Windsor 510
Ford 351 Windsor 525 (48) (168)
Ford 351M-400 575 (48)
Ford Y block V8 625 (272-312 CID)
Ford FE big block 650 (332-428 CID)
Ford FE big block 670 (1) ('59 352 CID)
Ford FE 625 (48)
Ford 427 SOHC 680 (48)
Ford 429/460 V8 640
Ford 429-460 720 (48)
Ford 460 V8 720 (10)
Ford BOSS 429 680 (iron block, aluminum heads)
Ford BOSS 429 635 (48)
Ford 4.6 SOHC 530 (93) iron block, aluminum heads
Ford 4.6 SOHC 473 (72)
Ford 4.6 SOHC 600 (168) (Mustang)
Ford 4.6 DOHC 464 (72) "9 pounds lighter than SOHC"
Ford 4.6 DOHC 437 (77) without accessories
Ford 4.6 DOHC 521 (94) aluminum block and heads
Ford 4.6 DOHC 576 (168) (Mustang)

Ford Triton V10 635 (128) "dressed"

 

wow!