TripleLude

Has anyone else noticed how awful the port work is on the A-side intake ports near the valve seats? This head has the worst port work I've seen in this area... or did I just get lucky?

The intake ports are fine on the IN side, but the VALVE side is terrible.

The seat area is machined out and then there is a lump of like 3mm casting choking out the flow before it opens up again. I guess you might call it a bottleneck. How does this affect the power band once opened up?

These pictures hardly show the severity, but it's what I have right now.

Before any port work:


During port work:


After porting:

TripleLude

And just for your reference, here is a picture with the B-side valves painted red for reference:

24TEN

iTrader: (2)

Could be lucky? But if all of them had that, then it's part of the molds. Maybe that was intentional for part of the flow when the valve is closing (throwing out a guess there to be honest). In for an accurate answer if one exists...