MWR Lash Adjuster and Rocker Retainer Kit – Lotus/Toyota 2ZR 1ZR 2AR 1AR


SKU: MWR-301155 Category: Brand:


An MWR Exclusive!!

All 1.8L 2ZR-FE and 2ZR-FAE, and all 1.6L 1ZR-FE and 1ZR-FAE engines in Lotus and Toyota cars. Fits with OEM wide or OEM narrow rocker.
All 1AR, 2AR engines

(16) Upgraded hydraulic lash adjusters (HLA)
(16) Rocker retainer clips
Rockers NOT included – works with your original rockers
NOTHING else required for install, this kit is all parts needed to upgrade one engine.

The ZR/GR/UR family’s roller/rocker style valvetrain allows for reliable, quiet performance and excellent performance camshaft profiles but it has a weak point. Above 7300rpm the lash adjusters fail to maintain adequate control of the rockers, and the rockers sometimes escape their proper position and fling loose. This causes a valve to no longer open, and can even cause severe damage to the cylinder head, valve cover and camshaft.

MWR’s improved hydraulic lash adjusters offer superior control at high rpm, and are also custom designed to allow us to add a rocker retainer clip (included). Better control and no possibility of the rocker bouncing itself free means you can confidently rev your engine as high as the rest of your build allows.

In our test engine equipped with MWR stage 3 cams and MWR upgraded valve springs and titanium retainers we have revved to 8800rpm+ with no signs of valve float or lifter pump-up or collapse.  These parts are engineered to go to 9500+ with the right build.

Warning: do not rev beyond the physical limitations of the other rotating and reciprocating components in your engine!!

Additional information

Weight 2 lbs
Dimensions 4 × 4 × 4 in