Originally Posted by sweetlil66
Im not sure what to do here.
The head on the truck had.
Valve shim - spring - A bowl that sets down on the valve about a 1ich or so -Valve lock/keeper
Now the exhaust valves is the only differences between the the head I got new and the head on my truck. The exhaust had shim- valve spring - cup that covers 1ich of the spring (Kinda looks like it to protect the spring or something) - Valve spring cup(Looks like this VALVE SPRING CUPS, USE WITH STOCK OD SBC SPRINGS ON AFTERMARKET HEADS - Alex's Parts Sales
) - valve spring RETAINER.
new head -Shim - Spring - bowl - cup - RETAINER (only on )
Other head- Shim - Spring - bowl - RETAINER - Ill try to upload a pic.
The tin shield you're describing is an oil shield (below). It, along w/a small rubber O-ring, was Chevy's way of controlling the amount of oil reaching the valve stem. This was used into the '80s.
The shields can be done away with if the seal is changed to a positive-type seal instead of the shield and O-ring setup. Otherwise, reuse them along w/new O-rings.
You need to see if the exhaust valves have rotators on them (left valve below, right valve has regular retainer). Rotators are a type of retainer that allows the exhaust valve to turn as the engine runs to lessen wear. They are thicker than the retainers found on intake valves, and are not generally used in performance applications.
The springs can be changed w/the heads on the engine. This is done w/compressed air to keep the valves closed or by filling the cylinder w/thin rope or cord until it's full, then the crank is rotated to push the piston against the rope to hold the valves closed. This is done on each cylinder on the compression stroke. We can add details if you need them.
The spring compressor has to be the type that works on a head assembled to the block. Some compressors can only be used w/the head off the engine as I'm sure you know.