460
A 383 is a .030" over bored 350 small block with a 400 crankshaft. The 454 is a big block.
400
4.310
460.36 cubic inches
468
It depends on the block, check with a reputable shop. A good estimate is .030 (Or 30 thousandths of an inch, in case I got the decimal wrong.)
462
Yes. Specialized equipment required.
I use autolite plugs in my 454 and you can feel the difference in performance over AC delco's.
4.310 bore X 4.250 stroke -- basically a 454 bored .060 over with a 1/4 inch longer stroke crankshaft as compared to the 4.250 stock bore size and 4.000 inch stroke of a 454. Just as an aside FYI, 427's have the same stock bore size as a 454's but have a 3.760 stroke.
what is the ignition timing for a 1988 Chevy 454 engine
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