How much money are you willing to spend on this porting and polishing job?
Who do you plan on doing it? A Pro, with extensive knowlege of fluid-dynamics, expensive, specialized measuring equipment and thousands of hours of experience under his belt might be able to eke a few more ponies out of the engine. If he had ten or twenty sets of heads to experiment with.
Doing it yourself, you might only lose 15 or 20 hp, if you're lucky.
Who do you plan on doing it? A Pro, with extensive knowlege of fluid-dynamics, expensive, specialized measuring equipment and thousands of hours of experience under his belt might be able to eke a few more ponies out of the engine. If he had ten or twenty sets of heads to experiment with.
Doing it yourself, you might only lose 15 or 20 hp, if you're lucky.