31. The OEM exhaust manifolds were used. To adapt these to the exhaust, the female connector piece was needed from the donor truck. If no donor parts are found, Stainless Works also offers a replacement connector piece. It’s critical to have at least one O2 sensor per side of the exhaust for proper engine management. You will need two per side if catalytic converters are used. We filled the radiator with traditional coolant, topped off the oil, installed a new oil filter, filled up the fuel tank, and performed a last minute check for any leaking fluids. With any engine work done, such as the camshaft swap, it’s a good idea to let the engine come up to operating temp and check for leaks or any ominous signs. Once the Blazer was cleared, a test drive was in order. The Blazer is now fully capable of being a daily driver, while offering vintage body lines with modern comfort, power, and reliability.