No, It does not change the ratio of the rocker arm. ( lift or duraration ) They are designed to keep from cutting into the rocker arm stud if you have a 500 lift or more camshaft that's it.
The term 'stock clearance' usually refers to items a shop no longer wants to sell - so they reduce the normal retail price dramatically to make it more appealing to potential customers.
To convert your 1971 Olds 350 Rocket to a full roller rocker setup, you'll need to replace the stock rocker arms with full roller rockers designed for your engine. Start by removing the valve covers and rocker arms, then install the new roller rockers, ensuring proper alignment and clearance with the pushrods and valves. It's also advisable to use compatible pushrods and check the geometry to ensure optimal performance. Finally, reassemble everything, double-checking torque specifications, and adjust the valve lash as necessary.
"Clearance stock" is a term that refers to items that have been greatly reduced in price in order to rid a company of inventory. For example, HP had several tablets called clearance stock that sold at 75% off.
no
I would say finding aluminum patio furniture particularly the clearance stock, would be much easier finding in stores. Because in stores, there is a lot of clearance stock at great affordable prices, as stores want to get rid of the old stock and get new stock in. Whereas online, it is much more difficult to find clearance stock.
STOCK is 1.5 ratio.
Yes.
The rocker arm ratio (whether they be stock or roller rockers) has to do with the offset of the rocker fulcrum. The stock rocker ratio on the small block Chevy is 1.5:1. This is important because it effects your valve lift. For example, a camshaft with .300 lobe lift will yield a .450 valve lift with the stock 1.5 ratio rockers. Multiply the lobe lift times the rocker ratio to get your valve lift. Now, that same camshaft will yield .480 lift with a 1.6 ratio rocker arm and .510 lift with a 1.7 ratio rocker arm. More lift is good as long as your valve springs can handle the extra lift and you don't run into valve/piston interference problems. You are more likely to run into coil bind with the valve springs than an interference problem though. When in doubt, make sure to check just to make sure there will be no problems.
physically check stock
There would be 0 backlash on a hydraulic cam. If you asking about piston to valve clearance, you would want about .100" , but shouldn't need to worry about it if it's stock.
I think the only time you have to do any cutting is when you're using guide plates.
You torque the rocker arm bolt down and that's it, no adjustment.