Fatso Short Block & Case

Gen II Fatso™
Short Block*
4.25 stroke 8.25 diameter 3 piece crankshaft
(4.25 Stroke, +.250 pinion shaft, 1.5 diameter heavy duty pinion bearing,
7.44 length connecting rods with .927 wrist pins)

Accepts stock Twin Cam® pistons and cylinders
(4.25 Stroke, stock 3.750 bore pistons and cyclinders = 94”)

No base gaskets required-uses Twin Cam® style
“O” rings

Use Midwest # 92-169
3.875 bore pistons to
build 100 CID engine.
*NOT Assembled

Gen I Fatso™
Case
Accepts standard 8.5 diameter Evo wheel sets (must change pinion shaft to +.250 long pinion shaft or Midwest
#98-554 crankshaft, 8.50 dia, 4.25 Stroke, +.250 pinion shaft, 7.44 rods length,
.792 wrist pin)

Accepts stock Twin Cam® cylinders(4.25 Stroke, stock 3.750 bore pistons and cyclinders = 94”)

No base gaskets required - uses Twin Cam® style “O” rings

Use Midwest # 93-825 3.875 bore pistons to build
100 cid engine

Includes cylinder studs & cam bearing (not shown)

Connecting
Rod Set
7.44 Length & .927 Wrist Pin
Twin Cam® Style
Connecting Rod Set

#98-580