Second Hand Mercedes-Benz SL Cylinder Head

The SL has spanned several distinct generations – the R107 (1971–1989), R129 (1989–2001), R230 (2001–2012), and R231 (2012–2020) – and cylinder heads are not interchangeable across these generation boundaries because the engines, architecture, and block dimensions differ completely between them. The generation name alone is not enough, though; you also need to match the exact engine code, which you can find on your V5 or via a VIN check. Always confirm compatibility with the breaker against your registration before buying.

Both the 2005 and 2010 SL fall within the R230 generation (2001–2012), which did receive a facelift in 2006, so these two cars may share engine codes depending on which engine you have, but mid-production ancillary and mounting changes can affect whether a head drops straight in without modification. Your engine code is the critical detail – match it exactly and then confirm with the breaker against your specific registration to be sure.

On the SL range, the trim or variant name like SL350 or SL500 directly reflects the engine fitted, so it does matter in the sense that an SL350 uses a different engine to an SL500 and the cylinder heads are not interchangeable between them. However, trim in the cosmetic sense – interior specification, colour, or option packs – has no bearing on cylinder head fitment whatsoever. Always match the engine code from your V5 rather than relying on the badge alone, and confirm with the breaker against your registration.

The engine code is the single most important detail you can supply – it tells the breaker exactly which head you need, cutting through any ambiguity caused by mid-year production changes or engines shared across multiple models. You can find your engine code on your V5C registration document or by running a VIN check, and it will look something like M272 or M113 depending on your generation and variant. Quote this code to the breaker alongside your registration for the most accurate match.

Yes, fuel type is fundamental – petrol and diesel cylinder heads are entirely different components with different combustion chamber designs, port layouts, and often different head bolt patterns, so a petrol head will not fit a diesel engine and vice versa. The SL range sold in the UK has been predominantly petrol, but always confirm your fuel type and engine code with the breaker to avoid any confusion. Never assume fitment based on the model name alone.

If the engine code is genuinely identical, a cylinder head machined to the same specification may physically fit, since Mercedes frequently used the same engine families across multiple models in the same era. That said, ancillary and mounting differences between model lines can affect whether the head installs cleanly without modification, and ECU or immobiliser considerations may also apply – both of these points should be confirmed with the breaker against your registration before you commit to buying.