The ZZ1 engine, even with its relatively high performance, was designed around a specific valve train geometry and lift. Using 1.6 ratio rocker arms will significantly increase valve lift, potentially leading to:
* Valve-to-piston clearance issues: Increased lift might cause the valves to hit the pistons, resulting in catastrophic engine damage.
* Spring issues: The stock valve springs may not be able to control the increased valve lift and may coil bind or cause valve float at higher RPMs.
* Pushrod geometry problems: The increased rocker arm ratio might change pushrod geometry, causing excessive wear or premature failure.
While some aftermarket parts might *claim* compatibility, you'd almost certainly need additional components like different springs, pushrods (likely shorter), and possibly even different camshafts, to accommodate the increased lift from 1.6 ratio rocker arms. It's a significant undertaking beyond simply swapping rocker arms. You'd essentially be undertaking a complete valve train upgrade.
