You can purchase new main bearing caps, but it will need to be fitted to the block by someone with line-boring equipment.
Let someone with rebuilding experience look at your situation to see if a new cap is truly needed. Another Answer The above is good advice. If the main cap is not damaged structurally, and depending on the size of the "chips" it may be better for you to just plan on using silicone sealant to fill the imperfections. Sometimes a cast piece can have minor imperfections, and if it doesn't affect the structural integrity of the piece it may be used anyway. As advised above, have someone with a little experience look at the cap. A good place to start would be the machine shop that cooked the block and bored the cylinders. BTW, if the machine shop has seen the cap and let it go it's probably just fine.
an exhaust flange gasket, is the gasket,commonly called a donut that is used to seal where the exhaust pipe is bolted to the exhaust manifold
Unbolt from the block & take the nuts off studs to exhaust flange. You will need a new gasket for the block & a new one for the flange.
Diagonally
A flange spreader is a device that uses a ratchet, leverage and fulcrum points to spread a bolt together connection. Usually welded pipe to flange, then a seal or gasket, and then another flange, and then welded or threaded pipe carries on. A flange spreader is used to spread the flanges apart to change a gasket or put in a spec blind to blank either side of the connection.
With a tape measure.
It would be best to get a new exhaust gasket.
A flange is the part of the pipe that you can bolt on a blow off valve, O2 Sensor, or other parts like that. The name that you are looking for it the Down Pipe Gasket.
Floor flange, cast iron ,brass with floor flange bolts (brass) wax gasket and make sure the line is vented
Gramophone Finish, is a Spiral Groove across the Face of the Flange. Easy to Fabricate on a Lathe. Provides a Good Surface for the Gasket to Mate with.
edelbrock has a square flange gasket fo it
I would check the Flange gasket. It is the gasket that sits between your exaust manifold and your exaust pipes
The thermostat is located (facing the front of vehicle) under the left end of the main upper radiator hose. Disconnect hose from flange by squeezing hose clamp until free. Two bolts hold the flange down and they are NOT the same length. Keep track of which length comes out of which hole. Lift the flange and remove by 1/2 turn to the left (note the single tab on the flange...remember which direction it faces. The thermostat is now full exposed and may be lifted out. Before you do, make sure you not only have a new thermostat but also a new gasket. Scrape old gasket away, apply new gasket, then re-place thermostat, flange and hose. Be gentle with the hose as it has a plastic piece in the middle (holds the fill cap) and I have seen them easily broken.