Here's why:
* Stock Rocker Arm Ratio: The 1992 305 Camaro likely has a stock rocker arm ratio of around 1.5:1. Using 1.6:1 rockers will significantly increase valve lift.
* Piston-to-Valve Clearance: Increasing valve lift can easily lead to piston-to-valve contact. The pistons in a stock 305 are not designed for the increased lift a 1.6 rocker arm will provide. This will result in catastrophic engine damage.
* Pushrod Length: A change in rocker arm ratio requires a change in pushrod length. Using the wrong length pushrods will cause incorrect valve geometry, leading to poor performance, valve float, and potential damage.
* Valve Spring Pressure: Higher valve lift will put more stress on the valve springs. Stock valve springs may not be strong enough to handle the increased lift and could lead to spring failure.
To use 1.6:1 rocker arms, you would need to:
* Verify Piston-to-Valve Clearance: This requires careful measurement and potentially machining of the pistons or heads to ensure adequate clearance.
* Determine Correct Pushrod Length: This often requires measuring and using specialized pushrod length checking tools.
* Upgrade Valve Springs: Stronger valve springs are essential to handle the increased lift and prevent spring failure.
* Possibly Other Modifications: Depending on the extent of the changes, you might need to address other components such as lifters or even the camshaft for optimal performance and reliability.
In short, while *possible* with extensive modifications and considerable mechanical expertise, it's not a straightforward bolt-on upgrade. It's a significant engine modification project that's best left to experienced engine builders. Sticking with rockers designed for your engine's specifications is the safest and simplest approach.
