did it once. I used a hole saw slightly smaller than the tube then finished with a brake hone and sandpaper. Not as good as a mill, but it worked fine.
If you haven't bought a manifold yet, Edelbrock now offers one for small block Chevys with the oil fill tube hole already machined. It's an EPS manifold (Edelbrock Performer Square Bore), and it even comes with the chromed oil fill tube and oil cap. Part # EDL-2703
Yes, I did mine a few years ago and I used a friend's mill. The hole came out perfect with a press fit. The only problem with a hole saw is keeping it at the angle you need and the same diameter you require. As mentioned above you can do it yourself if you take your time. The aluminum is very soft and the hole saw will walk on you if you are not careful. Good luck.
So- did we decide that a holesaw is acceptable for this? Thanks I'm doing the same for my "stock/sleeper" wagon. I used a flap disk on my angle grinder to remove the brand, etc then gently dimpled the surface to match the rough cast rest of the intake.
Just completed another one since my last post. I start with a 3/16" drill bit as a pilot then use a 1 1/4" forstner bit used in wood working in the mill.
One benefit if your hole saw wanders a bit is that fill tubes are tapered so you can get it tight even in a wallered hole.
Another trick to keep your hole saw from wandering is to replace the 1/4 pilot bit in the holesaw w/ a piece of 1/4 smooth rod, you'll have to drill the pilot hole first of course.
I did it to an air gap that I put on a '55 265 for a pcv valve and to install oil ..........the valve covers have no holes..........tp
Do a search for "pcv". You will find a ton of information and opinions on this. Posted using the Full Custom H.A.M.B. App!
The Jalopy Journal
