CRANKSHAFTS
Forged Steel Crankshafts - Cont. Scat 4340 Pro Series
Standard Weight features 4340 forged steel, heat-treated, nitride hardened, large fillet radii on all journals, lightening holes on rod journals, straight shot & chamfered oil holes, precision ground, and micro-polished. Lightweight has the same fea- tures as standard, with reduced rotating weight design with aero-wing counterweights. Superlight is same as standard but with a pounds-lighter design with aero-wing pendulum undercut counterweights and bridged rod journals. F-43 Lightweight is the same as standard, with gun-drilled main line, aero-wing counterweights, and exclusive pendulum undercut counter- weights.
Min. Rod Length Rod Pin
Rear Main Seal
Target Bobweight Grams
Approx. Wt. /Lbs.
Part No.
Description
Stroke 3.250" 3.480" 3.480" 3.480" 3.480" 3.500" 3.500" 3.500" 3.500" 3.562" 3.750" 3.750" 3.750" 3.750" 3.750" 3.750" 3.750" 3.750" 3.875" 3.875" 3.875" 3.875" 3.750" 4.000" 4.000" 4.000"
Main
Balance
SCA4-350-3250-5700
Standard Weight
5.700" 2.100" 350 5.700" 1.888" 350 5.700" 2.000" 350 5.700" 2.100" 350 5.700" 2.100" 350 5.700" 2.100" 350 5.700" 1.888" 350 5.700" 2.100" 350 5.700" 2.100" 350 5.700" 2.100" 350 5.700" 2.000" 350 5.700" 2.100" 350 5.700" 2.100" 350 5.700" 2.100" 350 5.700" 2.100" 350 5.700" 2.100" 350 5.700" 2.100" 400 6.000" 2.100" 400 6.000" 2.100" 400 5.700" 2.100" 350 6.000" 2.100" 350 6.000" 2.100" 350 6.000" 2.100" 350 6.000" 2.100" 400 6.000" 2.100" 400 6.000" 2.100" 350 6.000" 2.100" 350 5.700" 2.100" 350 6.000" 2.100" 350 6.000" 2.100" 400 6.000" 2.100" 350 6.000" 2.100" 400
2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 1-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc. 2-Pc.
Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Ext. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int. Int.
1820 1750 1750 1820 1750 1750 1750 1820 1750 1750 1750 1820 1820 1820 1750 1750 1820 1820 1750 1750 1750 1820 1820 1820 1820 1750 1750 1820 1750 1750 1750 1750
50
SCA4-350-3480-5700-18LW F-43 Lightweight SCA4-350-3480-5700-20LW F-43 Lightweight
40-42 40-42 52-55 40-42 40-42 52-55 48-51 40-42 48 52-55
SCA4-350-3480-5700
Standard Weight
SCA4-350-3480-5700-21LW F-43 Lightweight
SCA7-350-3480-5700 Excalibur Lightweight 3.480"
SCA4-350-3500-5700-18LW F-43 Lightweight
SCA4-350-3500-5700 SCA4-350-3500-5700-2
Standard Weight
Lightweight
SCA4-350-3500-5700-21LW F-43 Lightweight
SCA4-350-3562-5700-3-20 SCA4-350-3750-5700 SCA4-350-3750-5700-L SCA4-350-3750-6000 SCA4-350-3750-6000-2 SCA4-350-3750-6000-3 SCA4-400-3750-5700 SCA4-400-3750-6000 SCA4-400-3750-6000-3
Superlight
Standard Weight Standard Weight Standard Weight
52 52 52 44 52 52 44 48 50
Lightweight Superlight
48-51
Standard Weight Standard Weight
Superlight
SCA7-350-3750-5700 Excalibur Lightweight 3.750" SCA7-350-3750-6000 Excalibur Lightweight 3.750"
SCA4-350-3875-6000 SCA4-350-3875-6000-2 SCA4-400-3875-6000 SCA4-400-3875-6000-2
Standard Weight
52-55 52-55 52-55 52-55
Lightweight
Standard Weight
Lightweight
SCA7-350-3875-6000 Excalibur Lightweight 3.875"
50
SCA4-350-3750-6000-21LW F-43 Lightweight
40-42
SCA4-350-4000-6000
Standard Weight
54
SCA4-350-4000-6000-21LW F-43 Lightweight SCA4-400-4000-6000-21LW F-43 Lightweight
40-42 40-42
SCA7-350-4000-6000 Excalibur Lightweight 4.000" SCA7-400-4000-6000 Excalibur Lightweight 4.000"
50 50
REAR MAIN SEAL ADAPTERS
Allstar Performance Convert one-piece rear main seal on 1986 and newer small block Chevrolet to old-style, two-piece rear seal to accept earlier (pre- 1986) crankshaft. Billet aluminum adapters include hardware. Alignment tool allows quick, easy installation. Part No. Description ALL26125 For Early (Pre-1986) Oil Pan ALL26126 For Late (1987-Up) Oil Pan ALL26127 Alignment Tool ALL26125
Canton Part No. CAN21-850
Moroso Billet aluminum adapters convert 1986- up engines with one-piece rear main seal to use old-style, two-piece seal and early crankshaft. Part No. Description MOR38315 For New Style (1986-Up) Oil Pan w/1-Pc. Seal MOR38415 For Old Style (Pre-1980) Oil Pan w/Driver's Side Dipstick
Description
For Old Style (1986-Up) Oil Pan w/1-Pc. Seal
Chevrolet Performance Part No. Description
SBC 1-Pc. Seal Housing - Aluminum
GMP14088556
32
2021-22 ENGINE BUILDER CATALOG
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