[Kev457]

Originally Posted by JANNETTYRACING

The Chevron 94 is 94 octane and that is what I recommend you use, I would not exceed 10 psi boost on stock pistons on pump gas.

To get to 10 psi boost with your cam and mods you may need to move to a 3.5 or 3.375 only testing will say for sure as every combination responds differently.

Ted.

Thanks Ted. In this case, can I leave the crank pulley along and just change the upper pulley?

[JANNETTYRACING]

Originally Posted by Kev457

Thanks Ted. In this case, can I leave the crank pulley along and just change the upper pulley?

yes