M20 Race 885 Cylinder Head

The BimmerHeads Race 885 M20 cylinder head — our Stage 3 flagship build, the one we’d recommend for high-horsepower stroker and forced induction builds, and anyone building the most capable M20 possible.

Built on the OEM 885 casting, every Race head is built to order. Performance dual valve springs and KM Cams forged steel rocker arms come standard. Every Race head also receives combustion chamber polishing by hand — a step reserved for our Stage 3 build only. Choose your camshaft and valve configuration above — not sure which cam is right for your build? Contact us and we’re happy to help.

Every Race head receives:

• Cleaning & pressure testing
• Resurfacing
• Extensive porting & polishing by hand
• Combustion chamber polishing by hand
• New Supertech valves
• New Supertech valve guides
• New performance valve seals
• New camshaft o-ring & seal
• New BimmerHeads performance dual valve springs
• New KM Cams forged steel rocker arms
• New rocker arm hardware & eccentrics
• New intake manifold studs
• New thermostat housing studs
• New exhaust manifold studs
• New valve cover studs

Camshaft options:

• Regrind 280/274 — dual pattern — ground on a used OE BMW core with different intake/exhaust duration for stronger pull under boost. The go-to grind for forced induction builds.
• New 280/274 — same dual pattern 280/274 grind on a brand new core. For those who want the 280/274 grind without a reground cam.
• Regrind 284 — higher lift and duration for serious builds. Recommended for stroker M20s with higher compression. Strong top-end pull with a noticeable idle lope.
• New 284 — same 284 grind on a brand new core. For those who want the 284 without a reground cam.
• Regrind 284/280 — dual pattern — maximum aggression, with higher lift and duration on both lobes for serious horsepower under boost.
• New 284/280 — same dual pattern 284/280 grind on a brand new core. For those who want the 284/280 without a reground cam.

Valve options:

• Standard Size Supertech — 42mm black nitride intake / 36mm black nitride exhaust. The valve set behind every BimmerHeads M20 885 head build.
• +1mm Supertech & Machining — 43mm black nitride intake / 37mm Inconel exhaust. Head is machined to fit the larger valves. Choose this option when your build calls for maximum flow.

Each head is built specifically for your order — no cancellations are accepted once placed. Allow a minimum of 9–10 weeks production time.

Price includes a refundable $700 core charge. Once your BimmerHeads head arrives, use the original packaging to return your OE BMW 885 cylinder head (with camshaft). Cores that pass our inspection and testing receive a full $700 refund. If the camshaft is unusable or repairable damage is found, we will contact you before any deductions are made. Return shipping is the customer’s responsibility.

Our Spec Sheet has the installation references you’ll need — valve clearances, torque specifications, oil recommendations, and break-in instructions.

Built the way we’d want it done — this is our best M20 head work, and every Race head leaves BimmerHeads ready to make power.