3.9 and 4.0L cams are different, with the 3.9 having slightly more
lift (0.240 vs 0.236). I think the 4.0L might have gotten an intake manifold with slightly larger diameter runners but they look the same to me so maybe this is incorrect. Has anyone had any experience with Crow's '825 cam?
Progress is like a Commodore, if you don't keep pushing it, it stops.