Magnum heads on an LA enigine

You're absolutely correct Fishy. No apples to compare here. The desktop dyno is just a guideline and the results aren't gospel but they are a general estimate. But, the results give you a good idea of what's going on. I don't remember anyone taking a stock engine and just installing the Magnum heads with dyno tests before and after for a true comparison. So Brians original question can't truthfully be answered until someone does a comparison. The reason why Mopar Muscle used
Magnums is because they were easy to come by, they have a small combustion chamber that will raise compression, they flow well and respond well to light porting, they have 1.6 rockers for more lift, small valve stems, through the pushrod oiling, and the list goes on and on. toolman