wecvusmc Posted September 29, 2009 Share Posted September 29, 2009 I had built a 76 280z with an 82 Turbo engine with a stock oil cooler adapter (came in automatic turbos 280zx) piped to a Rx7 Oil Cooler. My original swapped in F54 Block cracked on me and I was unable to source another Turbo block so I decided to use a N42. I had finished most of the assembly and was putting on the oil cooler adaptor when I noticed there was two oil bypass passages, one in the block (normal) and one in the adaptor (also normal). So I walked over to my old useless block and noticed what appears to be a slug in the block to block off the bypass relief valve. I would like to use the oil cooler since its already in installed in the car and it can't hurt to use it...so: 1. Can I install the stock oil filter adaptor with both oil bypass relief valves? Or will they somehow cancel each other out, or bypass too much oil? Looking at the how the oil travels in the block it doesn't seem to be a problem but I want to make sure. 2. If I need to put a plug in, any idea what size it is (19mm?) or where I can get one? 3. If I don't need a plug does anyone know why it was done that way at the factory (just curious)? Thanks for your input! Quote Link to comment Share on other sites More sharing options...
jc052685 Posted October 16, 2009 Share Posted October 16, 2009 That plug should be the "anti-drain back valve" I have an oil cooler and dont have that part..... Quote Link to comment Share on other sites More sharing options...
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