I have a stock 5.9 Magnum Mopar Performance 300HP crate engine with about 30k on it.
If I change out the heads for EQ Hughs massaged with 2.02 intakes, associated exhaust valves and stronger behive springs but left the original cam, pistons and M1 dual plane intake manifold on it what kind of HP increase would I be looking at? I have a Magnum Edelbrock air gap I could use as well. Thought process would be to make these changes without removing the engine and no substantial teardown.
Thoughts and comments please.
