WHAT THE F*$K?!! That table is cracked out! I can appreciate the math done, but ...it's speculation on stuff nobody does!! NOBODY built 283's with 6.5" rods.
Since I'm not up on ford or Mopar lengths, let me just give a quick real world Spiceresque nutshell on chevy.
5.7" rod length from 262 to 350 V8's. 6.0" is the next best length step for the buck and 6.100", 6.125" and 6.200" are high buck Nascar lenghts for wicked high revs and great rod ratios.
400's use 5.565" stock rod. A switch to 5.7" rods is nice and frees up some revs and is quite common. 6.0" rod gets you into wicked expensive pistons, along with possible cam clearance issues and the need to possible switch to a small base circle cam or clearanced rods.
There IS NO 400 factory Big block. 396 or 402 not 400. 400 is sbc.
Big blocks from 366 and 427TD and 396-502 all run 6.135" rods stock.
6.385", 6.535", 6.600" (a sweet Bill Miller length) and 6.800" are the most popular flat out high rev rat rods.
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