While grinding on the "B" intake, I noticed that two areas have diaganal ridges in the bottom of the runners. I first thought they were casting defects, then concluded they were directional ridges to help the fuel mixture go to the long side runner. Is that a correct assumption? If so I assume they should be left as is?

Paul

Paul, there is a ridge that appears to keep too much fuel from going to Cylinder #2. Probably shouldn't be removed completely for street use but I have smoothed them over for high RPM use.

http://ford-y-block.com 

20 miles east of San Diego, 20 miles north of Mexico

Thanks John... I've been experimenting with a modified drill bit extender (shortened & machined down) to reach into the inner port areas. However, due to the single speed of my electric die grinder, imbalance of most the stones is proving to be a problem. Still experimenting with that situation. Another thing I noticed is, that the front upper port floors at exit, are slanted to the outside somewhat. Was that done for a reason or is it just a casting defect? Having the fuel mixture tend to the outer side of the port, doesn't on the surface of it, appear to be benificial. Yes, no?. And would it be a good idea to try to flatten the floor somewhat?. Checking the intake port exit openings against the intake openings on a set of "G" heads, it appears that Ford deliberately made the intake exit openings smaller than the head opening, to avoid interference. On a basically stock street engine, is it just as well to leave the intake openings as is, rather than opening them up to port match?.. I think that's enough questions for now.. Thanks - Paul

Paul

Folks; My previous post accidently gives the impression that it was intended just for John Mummert. If anyone else has input on modifying the "B" intake that is helpful, feel free to post it.. Thanks

Paul

Okay, I just picked up a "B" intake over the weekend and plan on going ahead with the mods discussed in this thread. One thing that wasn't covered was the tube near the base of the manifold. I remember it had a purpose, but can't remember what that was. So, do I plug it or leave it as-is. Below are a couple of pictures. There's a screw on one side and the tube appears open on the other.

Rono

  Ron Lane,  Meridian, ID

Rono, that was the heat supply for the automatic choke.  Often the tube rots out and the choke gets filled with exhaust carbon.  Also leaks exhaust out the inlet end of the tube.

John - "The Hoosier Hurricane"

With regard to the problem with the single speed electric die grinder, there is a device called a Variac. this varies the output voltage of the output side of a variable transformer. As die grinders are series wound this limits the speed of the grinder. You can easily con trol the speed. I like to use a 1/4 wooden dowel with wet or dry paper wrapped around it for final smoothing and polishing.

DW

For variable speed I have used old sewing machine pedals, put a male plug on one end and female on the other and can be used on different tools.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

Don & Billy; Thanks for the grinder speed limiting info. If I can't find either of the items mentioned, could a light dimmer switch in an electrical box, with a duplex plug, suitably wired, be made to work?.. John F., I think you have enlightened me re the choke heat setup. My 4 Bbl intake is the same as Rono's, having a single hole on one side of the crossover & an offset hole on the opposite side of the manifold, which is not the same as some other Y intakes, as to placement of the choke heat tube setup. (if I'm getting this right?) This had me scratching my head some. I was under the impression that all heat tubes took in air at the bottom "button" on the crossover & the tube curled upward & exited to the choke supply tube, on the same side. So, there were two layouts used?

Paul

Paul;

So back to my original question, did you plug your choke tube in some way or just leave it open?

Thanks,

Rono

  Ron Lane,  Meridian, ID