Oil drain back
#1
Oil drain back
Is it necessary to open up the oil drain back holes in the heads. I have restrictors in the cam. Just got a set of c heads back from being freshened up and noticed this was not done when comparing to a set of j heads that were previously on engine.
#6
For sustained high-RPM use, such as running at 5,000 RPM for long periods while racing, it is possible to pump all of the oil out of the pan, but have it not be able to drain back fast enough.
Not a problem generally encountered in any normal kind of use.
- Eric
Not a problem generally encountered in any normal kind of use.
- Eric
#7
It certainly couldnt hurt anything it the heads are off the car. I dont think you can open them up much, but i dont know how much is possible. There is a danger of getting into the water jacket. You can just smooth them some and the floor around them. Maybe someone else knows how much they can be opened.
#8
I did not request it to be done. Just wondering if it's a make or break mod with my motor. Valves/valve springs are installed ready to be put back on. Dump is scheduled for next Thursday. So all I'm asking is should I bring the heads back have them disassembled again to open up drain holes or will I be ok.
#9
Correction dyno time is scheduled for next Thursday. Looking at how the j heads were opened up. To me it looks like it was mounted at an angle on a drill press and opened up to about a 5/8 hole which maybe a 1/2" deep which opened up drain hole at an angle.
#10
OK, thanks! I think I understand now. So the op was talking about "enlarging" the drain holes, as opposed to unplugging them. That they would be plugged made no sense to me and is what had me confused.
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rootney
Racing and High Performance
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November 20th, 2014 12:39 AM