Manifold

AdamR said

Run it.

Click to expand...

I agree.

You won't see a difference going from a LD4B to an LD340, especially if the 4B has been port matched.

There have been more than a few that haven't seen a significant change going from a LD340 to and Air Gap. The old school guys at Edelbrock, Barton, and some of the other shops agree.

Run what you got, just block off the heat crossover for max performance.