500557 blocks were so bad, Pontiac went back to the 481988 for the 78 Trans Am. I'd only use a 557 block for a very mild application. We actually run one in my son's 67 GTO with a RA IV cam and 6x heads. Runs high 12's but makes me nervous!
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Randy Repp - RPMInjuns
ReppRacing A/Fuel Dragster
www.RPMOil.com
"Anything Less Is Just Crude"
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