Then why such a performance loss from 2.5 to 3", same motor?
And why did Pontiac assert the RAII heads were overexhausted to a point to where in order to correct, restrictive manifolds or modifying the heads for an approximate 70% I/O ratio?
The rule of thumb with any pontiac head is 70% I/O flow ratio..
The improvements were made with the 722's the following year.
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1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
