Roller rockers can squeak, especially if they are not properly lubricated or if there is excessive wear on the components. Squeaking may also occur due to misalignment or if the rocker arms are not installed correctly. Regular maintenance, including lubrication and inspection, can help prevent squeaking and ensure smooth operation. If squeaking persists, it may indicate a more serious issue that needs to be addressed.
The impala ss LT1 did not come from the factory with roller rockers, they came with stamped steel rockers. If you are installing roller rockers in yours, the common advise is to go 1/2 turn after 0 lash, when the pushrod no longer moves up and down.
Wikipedia shows the Toyota AR engine with roller rockers started in 2008. This particular engine has many low friction benefits to it.
It's not really about what rockers you run. If you have guide plates, you need hardened push rods.
No it does not. Unless someone else installed them. Was not factory.
No it does not, unless someone put them on it, Not factory on that year.
yes
Take off one of the valve covers, if the rocker has a roller tip on the side which it touches the valve spring then its a roller, if no roller tip is present then its a normal tappet rocker.
If you have a 2001 or newer engine, it comes with roller lifters and roller rockers from the factory.
yes, with roller rockers.
They can be ordered with 3/8" or 7/16".
Not if you did it right the first time.
1.5:1 with 3/8" trunions.