I decided to modify my ls1 pan. Spectra premium is the O.E. supplier for the LS1 98-02 Camaro oil pan. It is a U.S. made casting. The part number is GMP77A. It is available from Autozone for $143.99 plus tax after 20% off and free shipping when bought online. It includes the hardware, gasket, and the oil sender adapter that can be drilled for your sender or fitting, etc.
There is no need to pay for the pan to be milled. Cut it with a decent hand grinder. I used new 6" metal cutoff wheel and a new metal grinding wheel. I also bought a stainless wire wheel.
I drilled out the rivets that hold the gasket and removed the pan baffle. I used machinists dye at the areas where I needed to scribe the pan. After dye dried, I made a mark at the pan rail at the centerline of the first side bolt hole. Then, using the measurements from powerbyace, I measured back 8 3/8".Then I used a combination square to mark upwards along side of pan. I made a second line 1/8" inside of this line. I measured 6 1/8" forward from the first line and marked the rail. Again I made a second mark 1/8" inside the first mark. After doing both sides I connected the lines.
I used a $8 measuring caliper set to 7/8" and measured up (pan is upside down) from the pan rail. I just dragged the caliper along bottom and side of pan. I then made a second scribe line 1/8" above the first. I screwed the pan to a wooden bench top to keep it from jumping around while I was using the grinder. I cut to the inner scribe lines then used the grinder to sneak up to the final scribe lines. I had to unscrew pan from bench to get at the bracing that has to be cut on inside.
I fitted the rear piece first, then the bottom. The front piece drops in and needs no fitting. After everything was tightly fitted. I wire wheeled all surfaces to be welded.
I did some searching of local businesses and after being told not interested or quoted ridiculous prices, I found Mariah Metal Products. On their facebook page,
https://www.facebook.com/mariahmetal/ph ... 01/?type=3 there is a picture of a cast oil pan that was modified to fit a hellcat engine into a jeep. Things looked promising, so I paid $175 to have pan welded. There is some minor warpage along front of rail - I am guessing .020". I can lay pan on flat floor, kneel on sump and push down on front and it lays flat so I think the bolts should pull it flat when I install it on the engine. So far I am into the pan and pickup for approximately $550.
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