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Universal Fit

Need parts that work across platforms? Our Universal Fit collection includes components...

Universal Fit

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Welcome to WrenchIt — premium performance parts for serious builders.

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Collection: Mopar Small Block

Mopar Small Block specialists — featuring parts for 318, 340, and 360 engines. Designed to enhance performance and preserve the legacy of Chrysler’s small block power.

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204 products

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Speedmaster (204 products)

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204 products

Mopar Chrysler SB 318 340 Unplated Oil Pan

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Mopar Chrysler SB 318 340 Unplated Oil Pan

Vendor:
Speedmaster

Regular price $69.70 USD

Regular price ~~$82.00 USD~~ Sale price $69.70 USD

Sold out
Mopar Chrysler SB 318 340 Chrome Oil Pan

Sale

Mopar Chrysler SB 318 340 Chrome Oil Pan

Vendor:
Speedmaster

Regular price $71.24 USD

Regular price ~~$83.80 USD~~ Sale price $71.24 USD

Sale
Mopar Chrysler SB 318 340 360 Billet Handle Engine Oil Dipstick

Mopar Chrysler SB 318 340 360 Billet Handle Engine Oil Dipstick

Vendor:
Speedmaster

Regular price $16.30 USD

Regular price Sale price $16.30 USD
Mopar Chrysler SB 318 340 360 7.25" Internal Fluid Damper Harmonic Balancer SFI 18.1

Mopar Chrysler SB 318 340 360 7.25" Internal Fluid Damper Harmonic Balancer SFI 18.1

Vendor:
Speedmaster

Regular price $319.20 USD

Regular price ~~$183.16 USD~~ Sale price $319.20 USD
Mopar Chrysler SB 318 340 360 2 Bolt 12 Point Main Stud Kit

Mopar Chrysler SB 318 340 360 2 Bolt 12 Point Main Stud Kit

Vendor:
Speedmaster

Regular price $66.00 USD

Regular price Sale price $66.00 USD
Oldsmobile 400-455 0.546" OD. 0.3400" ID. 2.005" Intake & Exhaust Valve Guide

Oldsmobile 400-455 0.546" OD. 0.3400" ID. 2.005" Intake & Exhaust Valve Guide

Vendor:
Speedmaster

Regular price $9.70 USD

Regular price Sale price $9.70 USD
Mopar Chrysler SB 318 340 360 179cc 62cc Cast Iron Bare Cylinder Head

Sale

Mopar Chrysler SB 318 340 360 179cc 62cc Cast Iron Bare Cylinder Head

Vendor:
Speedmaster

Regular price $339.00 USD

Regular price ~~$398.80 USD~~ Sale price $339.00 USD

Sale
Mopar Chrysler SB 318 340 360 170cc 65cc Aluminum Bare Cylinder Head

Mopar Chrysler SB 318 340 360 170cc 65cc Aluminum Bare Cylinder Head

Vendor:
Speedmaster

Regular price $536.70 USD

Regular price Sale price $536.70 USD
Mopar Chrysler SB 318 340 360 12 Point Head Stud Kit

Mopar Chrysler SB 318 340 360 12 Point Head Stud Kit

Vendor:
Speedmaster

Regular price $89.10 USD

Regular price Sale price $89.10 USD
Pontiac 400 455 4340 Forged Steel Crankshaft ST-4.25 M-3.25 RJ-2.200 RMS-2Pc Ext

Sale

Pontiac 400 455 4340 Forged Steel Crankshaft ST-4.25 M-3.25 RJ-2.200 RMS-2Pc Ext

Vendor:
Speedmaster

Regular price $965.30 USD

Regular price ~~$1,135.70 USD~~ Sale price $965.30 USD

Sale
Ford FE 390 427 4340 Forged Steel Perform Crankshaft ST-4.125 M-2.7488 RJ-2.4384

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Ford FE 390 427 4340 Forged Steel Perform Crankshaft ST-4.125 M-2.7488 RJ-2.4384

Vendor:
Speedmaster

Regular price $938.40 USD

Regular price Sale price $938.40 USD

Sold out
Chevy BBC 454 4340 Forged Steel ST-4.500 8-Counterweight Peformance Crankshaft

Sale

Chevy BBC 454 4340 Forged Steel ST-4.500 8-Counterweight Peformance Crankshaft

Vendor:
Speedmaster

Regular price $820.90 USD

Regular price ~~$965.70 USD~~ Sale price $820.90 USD

Sale
Ford 351C 4340 Forged Steel Crankshaft ST-3.750 M-2.749 MRL-6.2 Bal-Int

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Ford 351C 4340 Forged Steel Crankshaft ST-3.750 M-2.749 MRL-6.2 Bal-Int

Vendor:
Speedmaster

Regular price $868.40 USD

Regular price Sale price $868.40 USD

Sold out
Chevy LS 4340 Forged Crankshaft ST-4.000 M-LS RJ-2.1 MRL-6.098 RMS-1Pc Bal-Int

Chevy LS 4340 Forged Crankshaft ST-4.000 M-LS RJ-2.1 MRL-6.098 RMS-1Pc Bal-Int

Vendor:
Speedmaster

Regular price $1,198.10 USD

Regular price Sale price $1,198.10 USD
Ford 351C 4340 Forged Steel Crankshaft ST-4.170 M-2.749 MRL- 6.0 Bal-Ext

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Ford 351C 4340 Forged Steel Crankshaft ST-4.170 M-2.749 MRL- 6.0 Bal-Ext

Vendor:
Speedmaster

Regular price $680.00 USD

Regular price Sale price $680.00 USD

Sold out
Ford 351C 4340 Forged Steel Crankshaft ST-4.100 M-2.749 MRL- 6.0 Bal-Ext

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Ford 351C 4340 Forged Steel Crankshaft ST-4.100 M-2.749 MRL- 6.0 Bal-Ext

Vendor:
Speedmaster

Regular price $868.40 USD

Regular price Sale price $868.40 USD

Sold out
Ford 351W Windsor 4340 Forged Crankshaft ST-4.250 M-351C RJ-2.100 Ext

Ford 351W Windsor 4340 Forged Crankshaft ST-4.250 M-351C RJ-2.100 Ext

Vendor:
Speedmaster

Regular price $868.40 USD

Regular price Sale price $868.40 USD
Ford 351W Windsor 4340 Forged Crankshaft ST-4.170 M-351C RJ-2.100 Ext

Ford 351W Windsor 4340 Forged Crankshaft ST-4.170 M-351C RJ-2.100 Ext

Vendor:
Speedmaster

Regular price $868.40 USD

Regular price Sale price $868.40 USD
Ford 351W Windsor 4340 Forged Crankshaft ST-4.100 M-351C RJ-2.100 Ext

Ford 351W Windsor 4340 Forged Crankshaft ST-4.100 M-351C RJ-2.100 Ext

Vendor:
Speedmaster

Regular price $868.40 USD

Regular price Sale price $868.40 USD
Ford 351W Windsor 4340 Forged Crankshaft ST-4.100 M-351W RJ-2.100 Ext

Sale

Ford 351W Windsor 4340 Forged Crankshaft ST-4.100 M-351W RJ-2.100 Ext

Vendor:
Speedmaster

Regular price $1,240.50 USD

Regular price ~~$1,459.50 USD~~ Sale price $1,240.50 USD

Sale
Ford 351W Windsor 4340 Forged Crankshaft ST-3.750 M-351W RJ-2.310 Ext

Sale

Ford 351W Windsor 4340 Forged Crankshaft ST-3.750 M-351W RJ-2.310 Ext

Vendor:
Speedmaster

Regular price $692.10 USD

Regular price ~~$814.30 USD~~ Sale price $692.10 USD

Sale
Ford 351W Windsor 4340 Forged Crankshaft ST-3.850 M-351W RJ-2.310 Bal-Int

Ford 351W Windsor 4340 Forged Crankshaft ST-3.850 M-351W RJ-2.310 Bal-Int

Vendor:
Speedmaster

Regular price $868.40 USD

Regular price Sale price $868.40 USD
Ford 289 302 5.0L 4340 Forged Crankshaft ST-3.400 M-2.2486 RJ-2.123 Bal-Int

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Ford 289 302 5.0L 4340 Forged Crankshaft ST-3.400 M-2.2486 RJ-2.123 Bal-Int

Vendor:
Speedmaster

Regular price $1,495.90 USD

Regular price Sale price $1,495.90 USD

Sold out
Chevy BBC 454 4340 Forged Steel Crankshaft ST-4.250 M-Std RJ-2.2 RMS-1Pc Bal-Int

Sale

Chevy BBC 454 4340 Forged Steel Crankshaft ST-4.250 M-Std RJ-2.2 RMS-1Pc Bal-Int

Vendor:
Speedmaster

Regular price $1,287.10 USD

Regular price ~~$1,514.20 USD~~ Sale price $1,287.10 USD

Sale

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