Almost no difference at all. There would be no noticeable difference in the engine.
While the engine is not running you measure the 'rocker gap' between rod and rocker with a 'feeler gauge' . Each engine has specs for this gap, and if it's too wide that's the noisy one.
That space is called "valve lash". It is a predefined gap set on a cold engine when the rocker arm is on the base circle of the cam.
rocker arms operate the valves that allow fuel into the cylinder and exhaust out. if they are worn then the valves won't fully reducing fuel admitted and so reducing power output for the effect.
Very hard to tell without removing a head, but if it has the factory intake and rocker covers the 307 would have an oil fill tube sticking up near the front of the intake with no fill plugs or cap in the rocker covers.
That is the hydraulic lifter
The function of a rocker arm is to control a valve in an engine. The rocker arm is a lever that rocks.
The function of a rocker arm is to control a valve in an engine. The rocker arm is a lever that rocks.
It is the gap between the rocker arm and the push rod or valve in the head of the engine. How much it is varies with each model of engine.
It is the gap between the rocker arm and the push rod or valve in the head of the engine. How much it is varies with each model of engine.
It is between the valve top and rocker For 4ba1 it is 0.40mm
your problem is the rocker/engine cover is blocked the only way to fix the problem is to change the rocker/engine cover.
It will cause the engine to run rough and eventually it will damage the valve and rocker.