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Pontiac of the Month

onetrick56's 1964 Grand Prix

2020 September
of the Month

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does anyone know if you can change the rocker arm ratio from 1.5 to 1.6 on a basically stock 69 400 to increase the lift.  I have done this on chevrolet motors in the past but am new to the pontiac motors and don't know how well this works. thanks in advance

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Here are a couple of articles on this very subject. Rocky Rotella and Jin Hand are established Pontiac enthusiasts and writers. 

https://www.hotrod.com/articles/hppp-1110-high-ratio-rocker-arms-install/

https://pontiacstreetperformance.com/psp/RockerArms.html

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Thank You

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