Factory Magnum Heads
Here are some port molds I made of stock magnum heads. I also cut a head up to see how far I could port plus how big of a valve I could fit. The intake shows how restrictive the pushrod area is on the magnum head. The exhaust has a bump on the roof which seems to pinch the port.
I also made molds of w2 heads. I don't have any pics of those, but it is easy to see why w2s flow so well.
Here are some port molds I made of stock magnum heads. I also cut a head up to see how far I could port plus how big of a valve I could fit. The intake shows how restrictive the pushrod area is on the magnum head. The exhaust has a bump on the roof which seems to pinch the port.
I also made molds of w2 heads. I don't have any pics of those, but it is easy to see why w2s flow so well.