Hey guys, I have a set of 906 heads and 2.14/1.81 valves. They are at the machine shop but I am going back and forth with the shop owner about the valve job. I want a steep 75 degree throat cut on the intake but he is scared to cut them because of the bulge in the bowl for rocker oiling. He is afraid a 75 degree cut down from the valve seat will break through. Anything special to watch for or advice on what I should tell the machinist. He is a chevy guy and I'm getting aggravated.

A 75 degree bottom cut is completely normal with 2.14 intake valves in a 906/915, right? I'm not just momentarily losing my mind?

I have no real idea my friend, hope others more educated than I chime in here.

Until then here's a set of 915's I won't take any farther for you to eyeball

Thanks roadhazard. Those ports look great! That's where I'm hoping to be soon if I can ever get the machine work done. What you have removed in porting is well beyond the 75 degree cut I want done.

Here is a shot of my 906's I did for my old 440. I had used a 70 degree stone and then I worked and blended the bowl area. Ron

Thanks Ron. I knew I wasn't crazy. At least not about this

Heading to the shop later today to talk to the machinist and show these pics if necessary. Thanks again everyone.

Do yourself a HUGE favor: Take them to a guy that KNOWS 906 heads.

I'd seek out someone who does (good running) stock and S/S heads.

The short turn is very important in a 906. Adding big valves makes the problem worse. The short turn needs to be lowered considerably when you are done

Thanks for the advice guys. I would have taken them to a better shop, but I don't know anyone locally who deals a lot with mopars I am familiar with making a nice rounded off radius from the bottom cut bellow the valve seat to the floor. I've done that on few sets I ported in the past but I've never lowered the floor there very much. How far into the short turn do you extend the radius to lower floor? I have always been leery of breaking through so I don't go back very far.
Do you guys suggest more of a round radius, consistent in shape from floor to valve job, or a radius that tapers off slower and longer as it approaches the floor? I may need to draw a picture to make sense of what I'm saying... Thanks guys!

I was taught to also make the walls at the floor right at the short turn a little wider to slow up the air to make the turn.. But not sure if that's correct nowadays

Any chance of you folks posting some more pictures . Looking for pix of the radius into the port floor. I'm porting a set of 452 heads and I could use all the info your willing to share. Thanks.