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I’ve been trying to find out how I should attach the stock exhaust to the LS1 that’s now in the car, have y’all found any part numbers or modifications that may work?
The stock headers for the 350 which fit the old exhaust. Headers I was thinking I could possibly use with modification Looking it seems as if these wouldn’t match up.
Nothing will bolt directly to the old SBC exhaust. You will have to modify the old system
I used Speed engineering long tubes for 82-92 Camaro LS on a recent 71 Impala build. I chopped the X-pipe at the rear of the trans and built the 18" or so to connect to the headers
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Need help finding headers for 1970 Impala 
