Editing Cadillac engine knowledge (section)
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===Block=== Blocks should get the standard deburring. A drain hole can be drilled into the rear of the lifter valley for better oil drain back and a spillway can be added to the oval hole at the front of the block to better lubricate the timing chain and the camshaft thrust face. Incidentally, later blocks have 1/2 inch oil galleries for increased flow through the block, so it makes a good performance base. A 472 can be made into a 500 by swapping in the 500 crank and pistons, although on 1968-'69 engines, a slight amount of notching is necessary at the bottom of the cylinder bores. If the front cover has [[rust]] pitting from the water pump, it can be saved by [[sandblasting]] and filling the [[Pitted rust|pits]] with JB Weld and then painting.
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