The reason this whole combo started was before there were aftermarket cranks you could offset grind a 4.21 " 455 crank to 4.25" using smaller BBC journals and then a common aftermarket forged BBC rod at 6.8 that was close to Pontiac length. Forged Pontiac rods were rare back then also unless you went with Carillo or Crower billet which were pricey(over $1K in the 80s-90s). Or use Butler/Banry Moravitz heat treated 58-62 rods.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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