stockers need torque. more the better. all that torque is made down in the 2800 to 3400 range. so the thinking you will gain power by running 4000 is not true, set your governor to 3800 to 3900 and don't worry about it. stuff to concentrate on is things that make torque. compression, advanced timing , a good valve job to improve air flow and flywheel weight are common things that help with that. coils, velocity stacks , K&N filters really in the big picture don't do much of anything
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