The upper elbows (or plenum I guess, not sure what its called)on our motors looks pretty easy to port and polish. Has anyone ever tried it? Did you gain any HP from it at all?
Has anyone ever ported or polished the lower? I would imaginge it'd be pretty hard an expensive and might even approach the cost of the "race manifolds" available for the cobra.
Has anyone ever ported or polished the lower? I would imaginge it'd be pretty hard an expensive and might even approach the cost of the "race manifolds" available for the cobra.