I can absolutely agree. Several times I stood in front of my Pantera (I bought it from a member here) scratching my head, asking myself "WHY?"
I just bring the examples from the engine:
Because the engine ran quite poorly and had a very extreme camshaft, I removed it and after opening it up I found:
- port stuffers in the intake ports of the heads but standard 4V ports in the Edelbrock Intake, so more than a quarter of the mixture hit a wall
- sheetmetal between exhaust port and manifold which was bent towards the exhaust port, I suppose that should also represent something like a stuffer??? But the exhaust gases flow the other direction, so they were bent back again, partly melted and blocked more than half the exhaust port on 5 cylinders
- Sometimes you get good surprises too. After removing the oilpan, I found out the previous owner "had forgotten" to mention that the engine is a 408...