1963 Pontiac 421 Super Duty engines came with what compression ratios?

  • Thread starter Thread starter Poncho Pete
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Poncho Pete

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All 421 Super Duty factory race engines, were said to have 405 H.P. regardless of compression ratio or carburator cfm sizes, (2X4 barrel). What were the compression ratios of the 1963 421 Super Duty engine factory?
 
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