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Re: 400sb from a '73
4.125" bore, 3.75" stroke, 8.5:1 compression, probably around 175 net hp.
400 oddities:
5.565" connecting rods vs. 5.7" for all other SBC's
"siamesed" cylinder bores with "steam holes" in block & cylinder heads
2.65" main journals vs. 2.45" for all other '68-up SBC's
externally balanced crankshaft used counterweighted harmonic balancer and flywheel
Block casting #3951511 has 4-bolt mains; other 400SB castings machined with 2-bolt mains. '73 could be 3951511 or 330817
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