This should help folks a bit I think.... Assume all the grinding and boring has been done (easier said than done!)
So without further ADO
1/. Take a clean block, that had a re bore, and new cam bearings (in ideal world if needed new core plugs as well). Wipe everything dry and clean, make sure you have plenty of room and access to all side of the block.
I shall assemble the Crankshaft first so we start with the main bearings, rear main bearing first, making sure the tab is located the correct way around in the block (see the right edge of the bearing has a locating tab).
I then add the middle main bearings (note this has the thrust faces on the bearing, an automatic engine would have two of these. This is a manual engine so only one is used.
The last main bearings added and the Rear crank oil seal sat in place.
I now use a paste that graphite based to lubricate the main bearings. the principle is that this will hold lubrication in the engine for a short while once the engine is first started and protect the bearings whilst oil is being distributed around the engine at first start up. It never drys up and is so sticky it will not run away whilst the engine sits in storage.
The crank is then lowered into place with the rear crank oil-seal sat in its channel at the rear of the engine.
The front and middle main caps are then lubricated with the same graphite paste and placed into position on the block. They are not tightened down at this point.
The rear main cap needs a sealant along its edges to form a seal, i use sealant and only place a very small amount on the outside edges of the main cap. Be careful not to drop sealant into the engine block.
Then place the Main cap in place and tighten down, sufficiently to close and seal the cap in place.
The crank is now fitted and the rest of the engine can be built around it..