oil drain backs

[427Fastback]

I was fitting my Edelbrock heads to one of Jays adaptors and noticed that the adaptor/head needed a little Christmas carving for the upper drain backs...





I did a little carving on the head and back cut the adaptor to allow some flow..I may or may not remove some more.I do not run big oil pressure or volume.I also ran a .500 reamer through the end drainbacks

I could have cut a window in the pushrod tube but didn't think I needed to go that far...It probably would have been easier tho.







Cory

[jayb]

That's a good modification; maybe I should build that mod into my CNC program for the adapters.  Are you using the drainback tins under the rocker stands?  If so, I assume they are the short ones?  I don't think the long finger tins will fit the adapter without a lot of trimming.

When I wrote the machining programs I was more concerned about the oil draining back through the drainback holes at the corners of the heads, so I put a relief in the head face of the adapter, on each end, to make sure the oil had a place to go...

[427Fastback]

Hi Jay...yes I plan on using the std tins.The fingered ones are not even close to being able to fit.After looking at what I did I could also have just cut the corner down on the pushrod tubes enough to intersect the Edelbrock drain slot but I am not really set up at home for that.The oil then would just run down the tube hole.A aggressive 45 on the pushrod tube would work as well.
You might be able to add a program and have the endmill knock the side out of the tube maybe .75 deep when you machine the pushrod holes..
There are many options....

Cory