MED 1.5 LDX ROCKERS

Benefits of the MED roller-tip rockers

Standard rockers rarely give consistent valve lift across the head, even when new. After many years of use and wear, lift is likely to be even more inconsistent, so while 1.28:1 is generally given as the standard rocker ratio, a quick check of the valve lift will usually show otherwise. Optimising every aspect of the engine will enhance performance, and the 1.5 rockers will give more lift than standard.

Roller tips reduce side loading of the valve stems, in turn reducing friction whilst also improving valve and guide longevity.

Add to this extra stiffness across the shaft, trouble-free tappet adjustment from enlarged adjusters, and you have an excellent performance upgrade. 

Intended fitment

The MED LDX roller-tip rockers are primary aimed towards competition usage with the 1275 A-Series cylinder head, but will also suit the 1071 and 970 Cooper S engines, which share the same valve stem spacing. 

If you are running a more exotic race head with offset exhaust valves, we also make an alternative design with the correctly offset arms to suit.

Although aimed at competition engines, the LDX rockers can also be used on more mild road-going engines if you're keen on having the very best rocker assembly possible. Apart from the extra cost, there are no downsides to using these on the road.

1.3:1 vs 1.5:1 rockers vs LDX

All MED race camshafts are optimised to work best with 1.5:1 rockers. If you're already satisfied with the performance of your engine, the regular 1.3 ratio will retain much of the same powerband, but with the performance and reliability of our roller-tip rocker assemblies. For those in search of a bit more power, ultimately 1.5 rockers will achieve this.

The LDX design goes one step further to reduce flex at high RPM levels, making it the ultimate choice for competition usage.

Optional extras

We always recommend changing the head gasket when removing the rocker assembly, as you may end up disturbing the gasket while loosening off the rear stud nuts. Arm clearance can sometimes be an issue when using the standard head studs and nuts, so an upgrade to ARP head studs and nuts is a good plan.

The standard steel rocker cover will clear these rockers, but aftermarket aluminium types will usually catch the arms on the rear corners. So either machine out material from the inside of the cover or upgrade to an MED rocker cover, which comes pre-machined internally to suit.