I've been doing a little work to the E-heads. Picked-up a set of 2.19 intake valves from Brent. got the 3/8" pilots and and valve seat height gauge. I trimmed the exhaust seats to get them all at the same height and improved the concentricity. Also, I had scribed the cylinder shape of the head gasket to unshroud the valves. The 482 was boarderline of too high compression so adding a little volume to the chamber would help keep it in the safe zone even if the unshrouding didn't do anything for flow. I started working on the intake seats and there was quite a big of material to remove. The cutter lift a long 60 degree angle and hefty ridge at below that. Today I ordered a 75 degree cutter with a radius at bottom. I think this will work good to initially blend the long 60 degree into the bowl, then finish by hand.
Here is a question. I read about there being a venturi shape below the seat which helps low-lift flow. From what I was reading this ID of the throat should be about 83-85% of the valve diameter. Looking at these E-heads out of the box it seems like there is not much for venturi or any reduced throat ID. It's as if you are lifting the lid off a barrel when the valve opens. Going with the 83% formula using the bigger 2.19 valve the cutter is still a ways away from touching the ID below the seat.
So far so good, other than needing to replace one intake seat because I cut to far. Of course Edelbrock uses non standard seat dimensions. Luckily they had a few on the shelf that I bought today. With 2-day air they should be here Wednesday.
In this pic, the really wide angle is the 60 degree, then a ridge below that. I'm wondering how narrow to make the 60 and smooth out the ridge? About the same as the 45 and 30? Or keep it longer? Not yet sure what to do in this area.
