Product Summary

Universal Fit, 4.000" Bore Size, Cast Iron, Yes

    Key Specs

    MFG. Part #450021

    Need To Know

    Truck Ship

    Truck shipments must be pre-paid with a credit card, certified check or money order

    Quick and Easy Returns

    Return Policy


    Edelbrock Part # 450021 Small-Block Chevy Cast Iron Engine Block is cast and machined in the U.S.A. and made to last. Being cast and machined in the U.S.A. allows Edelbrock to precision machine them to their very own specifications. Engine block part #450021 is the perfect starting point for any Small-Block Chevy high-performance engine build especially when used with an Edelbrock Total Power Package. When it comes to starting with the right base for your engine build... make sure to choose the one made right here in the U.S.A.

    Edelbrock part #450021 Small-Block Chevy Cast Iron Engine Block is manufactured to the following specifications:

    • Block Type: Small-Block Chevy
    • Block Material: Cast Iron
    • Cylinder Wall: Wet
    • Supplied Bore Size: 4.000"
    • Supplied Stroke Clearance: 3.750"
    • Max Recommended Bore: 4.060"
    • Max Recommended Stroke: 3.750"
    • Max Recommended C.I.: 388
    • Deck Height: 9.025"
    • Cam Bearing Bore ID: 2.000"
    • Camshaft Position: Standard SBC
    • Head Bolt Pattern: Standard SBC
    • Inside Head Stud Bosses: No
    • Lifter Bores: Standard SBC
    • Main Bearing Size: Standard SBC 350
    • Main Bearing Bore: 2.6406"
    • Main Caps: 4 Bolt Splayed Nodular Iron
    • Oil System: Main Priority
    • Oil Cooler Holes: N/A
    • Rear Main Seal: 1-Piece
    • Hydraulic Roller Provisions: Yes
    • Stud and Bolt Holes: Through to Water
    • Tapped Holes: Standard Thread & Pitch
    • Timing Chain/Gears: Standard SBC
    • Timing Cover: 8 or 10 Bolt
    • Fuel Pump Boss: Yes
    • Starter: Standard Location
    • Clutch Linkage Boss: Yes


    CARB Warning

    Follow EPA, CARB, and state regulations for engine changes

    Emissions warning: this part is for vehicle engine changes, not direct oem engine replacements. In California, engine changes are legal when done in compliance with California bureau of automotive repairs (bar) engine change policy. For assistance, call bar referee at: (800) 622-7733. And see https://bar.Ca.Gov/consumer/smog_check_program/engine_changes. All customers must comply with federal epa mobile source enforcement memorandum no. 1a (and addendum) and all applicable state regulations when conducting engine changes. Improper installation and/or use of this part in California may subject the installer and/or owner to a $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and laws of all states for use of this engine change part on makes or models of vehicles that render them noncompliant with applicable state and/or federal emission laws with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine


    MFG. Part #450021
    Bore Size4.000"
    Main Journal Style350 mains
    Deck Height9.025"
    Rear Main Seal Style1-piece
    Material TypeCast Iron
    Cylinder WallWet
    Sold in QuantityEach
    GTIN Code085347999507
    Head Bolt PatternStandard
    Inside Head Stud BossesNo
    Fuel Pump BossYes
    Finished Cylinder BoresYes
    Main Bearings IncludedNo
    Main Bolt Style4-Bolt
    Main Cap Fasteners IncludedYes
    Main Cap MaterialNodular iron
    Main Caps IncludedYes