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To those who have chopped your oil pans...

4.7K views 5 replies 3 participants last post by  THEFERMANATOR  
#1 ·
I'd like to hear from the folks who have more experience than me at cutting, chopping, sectioning, whatever you would like to call it, an oil pan on a duramax.

I'm in the process of putting an lbz duramax in my '67 rs camaro. I have a chassisworks front subframe that is going to allow the dmax to sit nice and low in the engine compartment, but not quite low enough to fit under a hood with the turbo sitting in the stock location.

For ground clearance I was already planning on cutting the lower pan a little. But upon a very rudimentary test fit one afternoon just to see what it looked like sitting in the engine compartment it looks like I may need to cut about an inch out of the front of the upper oil pan. Not too bad I guess, but none the less, it needs to be done.

I tried looking at DPR's website to look at their dry sump setup but their website was down. When I spoke to Curtis Halvorson about it months ago I believe he told me it was only 3 1/2 inches deep. So what have you guys done? What works and what doesn't work? My biggest concern is creating a "scavenging effect" with oiling the lower end or creating bearing failure.
 
#2 ·
I just had to remove mine because it's broken. That cast aluminum "upper pan" is called a "lower crankcase" by the factory. It is a structural member of the block, the rear block cover and the transmission plate. I'd think long and hard about moving the frame and cross member around on my race car before cutting into that upper oil pan.
 
#4 ·
The subframe is a direct bolt in for 1st generation f bodies, and the crossmember on it is a major structural point where the front suspension and steering mounts to, so I think I'm going to have to leave it where it is. I appreciate the idea though, I definitely didn't think of that.
 
#5 ·
Did you have to cut your oil pan when you swapped the duramax in your Suburban? I was thinking that if the pickup was in the way it could be "modified" a little to gain some more clearance. I've seen a few cummins conversions where they simply cut a portion of the pickup tube and welded it back together when they cut the oil pan.