BMW Internal Engine Parts for BMW 3 Series E30 (1984-1991)

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Rebuilding your engine or giving your cylinder head an overhaul? Internal engine components covers parts that are located within the engine block and cylinder head. Examples include: timing chains and tensioners, rocker arms, rod bolts and studs, head bolts, valve springs, connecting rods, and more. These are Genuine BMW engine parts, performance upgrades, or approved aftermarket brands that have a long track record of reliability and quality.

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Cylinder Head - Complete - E30 325i, E34 525i, M20 engine

Upgrade to the less restrictive cylinder head found on the M20 2.5L

T#:222771

Part#: 11121707032C

Ships in 8 Business Days

$ 1,322.99 USD

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$ 1,322.99 USD

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This replacement cylinder head for BMW M20B25 6 cylinder engine comes completely assembled with new valves, valve springs, valve guides and seals. Being assembled this cylinder head makes for a much quicker and easier job of installation. The camshaft is not included but is available separately.

This cylinder head is manufactured in Spain by Amadeo Marti Carbonell, a company that meets or exceeds the ISO 4000, ISO 9000 and TS-16949 standards so you can be assured of a quality part.BMW has discontinued this part so this is the only current source for M20 cylinder heads.

This item fits the following BMWs:
1988 E30 BMW 325e 325es
1987-1991 E30 BMW 325i 325ic 325is 325ix
1988 E28 BMW 528e
1989-1990 E34 BMW 525i

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Cylinder Head - Bare - E30 325i, E34 525i, M20 engine

T#:22168

Part#: 11121707032

Ships on Aug 12, 2026

$ 999.00 USD

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$ 999.00 USD

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This replacement cylinder head for BMW M20B25 6 cylinder engine includes new valve guides and seals. The stock valve guides are not replaceable so if you need new guides you likely need a new cylinder head.This cylinder head is manufactured in Spain by Amadeo Marti Carbonell, a company that meets or exceeds the ISO 4000, ISO 9000 and TS-16949 standards so you can be assured of a quality part.BMW has discontinued this part so this is the only current source for M20 cylinder heads.

This item fits the following BMWs:
1988 E30 BMW 325e 325es
1987-1991 E30 BMW 325i 325ic 325is 325ix
1988 E28 BMW 528e
1989-1990 E34 BMW 525i

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CP Forged Piston Set BMW M20 B25 Std.

T#:26205089

Part#: CP-FPS-M20-B25

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$ 1,349.99 USD

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$ 1,349.99 USD

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CP-Carrillo represents the highest quality pistons on the market, engineered for maximum power and durability. Utilizing high-strength, lightweight materials and advanced engineering, this BMW M20B25 piston set features: Lightweight Design: CP-Carrillo pistons are made from high-strength, lightweight materials, such as forged aluminum alloy. Reduced piston weight contributes to improved engine responsiveness and acceleration. Advanced Engineering: CP-Carrillo engineers use state-of-the-art technology and engineering techniques to manufacture pistons that offer optimized combustion, improved fuel efficiency, and increased power output. CP-Carrillo pistons are the best choice for any M20 engine and application, from street bully to all-out track car, and are engineered by one of the most respected names in motorsport to improve performance and reliability. Piston Sets Include: - Pistons - Rings - Pins - Locks - Spec Sheet

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CP-Carrillo Connecting Rod Set M20 Pro-Xtreme

For Vehicles With 135mm Connecting Rods

T#:26205099

Part#: CAR-CRS-M20-XT

Ships in 3 Business Days

$ 2,099.99 USD

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$ 2,099.99 USD

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The 5150 AutoSport Pro-Xtreme Connecting Rods, made by CP-Carrillo, are designed to handle extreme horsepower and high RPM applications for BMW M20 engines with 135 mm Rods. Constructed from high-strength, aircraft-grade steel, these connecting rods are engineered to withstand the forces generated by high-powered engines. The Pro-Xtreme design is specifically tailored to handle up to 2000 horsepower, making these rods suitable for high-performance turbo/drag racing or street/strip applications. They are also designed to handle high engine speeds of up to 9500 RPM, which is necessary for achieving maximum power output. Each connecting rod is precisely fabricated to meet the demands of high-performance engines using advanced manufacturing techniques such as computer-aided design (CAD) and finite element analysis (FEA). The Pro-Xtreme Connecting Rods are designed to be durable, reliable, and capable of handling the extreme stresses and forces generated by high-horsepower and high-rpm engines. Please note that these 135 mm connecting rods are designed to fit M20 135mm Rod engines. They will NOT fit 130 mm Rod Engines.

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CP Forged Piston Set - M20B27 - 84.5mm Bore, 8.5:1 CR

T#:26271772

Part#: CP-FPS-M20-B275

Ships in 3 Business Days

$ 1,396.99 USD

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$ 1,396.99 USD

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CP-Carrillo represents the highest quality pistons on the market, engineered for maximum power and durability. Utilizing high-strength, lightweight materials and advanced engineering, this BMW M20B27 piston set features: Lightweight Design: CP-Carrillo pistons are made from high-strength, lightweight materials, such as forged aluminum alloy. Reduced piston weight contributes to improved engine responsiveness and acceleration. Advanced Engineering: CP-Carrillo engineers use state-of-the-art technology and engineering techniques to manufacture pistons that offer optimized combustion, improved fuel efficiency, and increased power output. CP-Carrillo pistons are the best choice for any M20 engine and application, from street bully to all-out track car, and are engineered by one of the most respected names in motorsport to improve performance and reliability. Piston Sets Include: - Pistons - Rings - Pins - Locks - Spec Sheet

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Athena Cut Ring Head Gasket S14

T#:28537477

Part#: ATH-HG-CR-S14-95

Ships in 3 Business Days

$ 284.99 USD

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$ 284.99 USD

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This Athena Cut Ring Head Gasket is specifically engineered to replace BMW part 11121316714 for the S14B20, S14B23, S14B25, S14B27 engines found in the E30 M3. Factory OEM & MLS head gaskets are only engineered to handle a limited amount of cylinder pressures before they start to leak, causing a range of issues, including engine overheating, loss of power, misfires, and in severe cases, catastrophic engine failure. Athena-SCE Cut Ring Head Gaskets are uniquely designed to handle increased cylinder pressure caused by power modifications, making them the recommended choice for applications making 16+ psi. Design: Athena-SCE's gasket body is composed of Motorgasket, a reinforced material developed by Athena's R&D department. This consists of a steel core covered with two layers of asbestos-free aramid fibre and offers excellent thermal and mechanical resistance without compromising its ability to adapt to mating surfaces. To ensure maximum sealing under all conditions, a silicone bead is also applied to critical sealing areas, such as oil and coolant passages. The AISI 304 stainless steel cooper rings bite into the aluminum head, providing maximum sealing around the cylinder bore and optimizing engine performance, even on engines with nitrous and/or turbo applications that exceed 2 bar boost.

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CP Forged Piston Set BMW M20 B27 Std.

T#:26205091

Part#: CP-FPS-M20-B27

Back Ordered

$ 1,349.99 USD

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Qty

$ 1,349.99 USD

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CP-Carrillo represents the highest quality pistons on the market, engineered for maximum power and durability. Utilizing high-strength, lightweight materials and advanced engineering, this BMW M20B27 piston set features: Lightweight Design: CP-Carrillo pistons are made from high-strength, lightweight materials, such as forged aluminum alloy. Reduced piston weight contributes to improved engine responsiveness and acceleration. Advanced Engineering: CP-Carrillo engineers use state-of-the-art technology and engineering techniques to manufacture pistons that offer optimized combustion, improved fuel efficiency, and increased power output. CP-Carrillo pistons are the best choice for any M20 engine and application, from street bully to all-out track car, and are engineered by one of the most respected names in motorsport to improve performance and reliability. Piston Sets Include: - Pistons - Rings - Pins - Locks - Spec Sheet

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BMW Internal Engine Parts for BMW 3 Series E30 (1984-1991)

Sub-Categories

Cylinder Head - Complete - E30 325i, E34 525i, M20 engine

Cylinder Head - Bare - E30 325i, E34 525i, M20 engine

CP Forged Piston Set BMW M20 B25 Std.

CP-Carrillo Connecting Rod Set M20 Pro-Xtreme

CP Forged Piston Set - M20B27 - 84.5mm Bore, 8.5:1 CR

Athena Cut Ring Head Gasket S14

CP Forged Piston Set BMW M20 B27 Std.

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