MAIN BEARING CAPS
Billet Speedworks Billet Main Bearing Caps Billet main caps offer increased bottom end strength. Many of the billet caps listed are for converting a two-bolt main block to the more durable four-bolt main configuration. Part No. Description Pontiac V8 PGEP400C 4-Bolt Center Main Caps, 389-421 Blocks PGEP400C4A 4-Bolt Splayed Center Main Caps, 389-421 Blocks PGEP400F 2-Bolt Front Main Cap, 389-400 Blocks PGEP455C 4-Bolt Center Main Caps, 455 Blocks
CRANKSHAFTS
Pontiac 400-455 Eagle 428/455 4340 Forged Steel Crankshaft
EAG104554210
Crankshaft is a SAE 4340 steel non-twist forging, multi-stage heat treated, stress-relieved, .125" radii for use with narrowed bearings, chamfered oil holes, cross-drilled oiling, shot-peened, nitride-hardened, X-rayed, magnafluxed, and sonic tested. Recommended for use up to 1500 HP.
Min. Rod Length
Rod Pin
Rear Main Seal
Target Bobweight Grams
Approx. Wt. /Lbs.
Part No.
Description
Stroke 4.250"
Main
Balance
EAG445542506700
455
6.700" 2.200" 3.250"
2-Pc.
Ext.
2280
75
Eagle “ESP” Cast Steel Crankshafts Features .092" radius on rod and main journals, rear seal and snout, compatibility with standard OEM-style bearings.
Min. Rod Length Rod Pin
Rear Main Seal
Target Bobweight Grams
Approx. Wt. /Lbs. 73-76
Part No.
Description
Stroke 4.210" 4.250"
Main
Balance
EAG104554210 EAG104004250
455, Standard Weight
6.625" 2.249" 3.250" 6.700" 2.200" 3.000"
2-Pc. 2-Pc.
Int. Int.
2280 2280
400, Standard Weight, With Big Block Chevy Journal 455, Standard Weight, With Big Block Chevy Journal
73-76
EAG104554250
4.250"
6.800" 2.200" 3.250"
2-Pc.
Int.
2280
73-76
Eagle Cast Steel Crankshafts “ESP” features SAE 4340 steel non-twist forging, multi-stage heat-treated, stress-relieved, .125" radii for use with narrowed bearings, chamfered oil holes, cross-drilled oiling, shot-peened, nitride-hardened, X-rayed, magnafluxed, and sonic tested. Recommended for use up to 1500 HP. 3.00" = 400 Mains, 3.250" = 455 Mains.
Min. Rod Length Rod Pin
Rear Main Seal
Target Bobweight Grams
Approx. Wt. /Lbs.
Part No.
Description 326-400
Stroke 3.750" 4.210" 4.250"
Main
Balance
EAG104013750 EAG440042106625 EAG440042506700
6.625" 2.250" 3.000" 6.625" 2.249" 3.000" 6.700" 2.200" 3.250"
2-Pc. 2-Pc. 2-Pc.
Ext. Int.
—
— 76 76
400, Standard Weight
2280 2280
455, Standard Weight, With Big Block Chevy Journal
Int.
Scat 4340 Steel Crankshaft Pro Series features 4340 forged steel, heat-treated, nitride-hardened, large fillet radii on all journals, lightening holes in all rod journals, straight shot and chamfered oil holes, precision ground and micro-polished. 3.250" = 455 Mains
Min. Rod Length Rod Pin
Rear Main Seal Balance
Target Bobweight Grams
Approx. Wt. /Lbs.
Part No.
Description
Stroke
Main
455, Standard Weight, With Big Block Chevy Journal
SCA4-400P-4250-6700-2200
4.250" 6.700" 2.200" 3.250" 2-Pc.
Int.
2280
76
476 2021-22 ENGINE BUILDER CATALOG
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