Provided you devoir to burgeoning the pulling or towing potential of your 1999 Chevy Blazer, install headers and you Testament add low-end torque that helps the Blazer accelerate from a dead block with hefty payloads. Headers further select stress off the engine since exhaust gases escape the combustion Hospital ward faster than provided criterion exhaust manifolds are installed. Changing the headers on the Blazer is relatively cinch compared to some vehicles over you can convert them without removing the engine or Engine mounts.
Instructions
1. Spray Everyone bolt that secures the exhaust manifold to the engine heads with a penetrating lubricant oil (Liquid Wrench, PB Blast, Zep45 or coincidental) and spare various hours (preferably overnight) for the oil to penetrate the rust on the bolts. Besides, spray the bolts that secure the exhaust-manifold ball flange to the catalytic-converter ball flanges and the Oxygen sensors that bolt into the exhaust manifold.
2. Place the vehicle on front-end ramps and secure the Blazer by pulling the emergency brake. With the bolts removed, pull downward on the catalytic converter to separate the flanges from each other. Complete this step while under the vehicle.4. Remove the O2 sensors from the exhaust manifold with an adjustable wrench.
Place a wheel chock behind the rear tire to prevent the Blazer from rolling backward while you are under the vehicle.3. Remove the bolts that hold the header ball flange and the catalytic-converter ball flange together. There are four bolts in total, two on each side.
Do not disconnect the O2 sensor wires from the wiring harness. Secure the O2 sensors out of the way with wire tires to prevent them from being damaged.
5. Remove the bolts that secure the exhaust manifold to the engine heads with a medium-length socket. If the bolt does not easily turn counterclockwise, spray it with more penetrating oil and move to the next bolt. Go back to it when the other bolts have been removed. If the bolt still will not turn, heat it with a small blowtorch and then remove it.
6. Pull the exhaust manifold off the bolt studs and pull the old copper manifold gasket off the bolt studs.
7. Place the new header gasket onto the bolt studs. Inspect the gasket to ensure the exhaust ports are not blocked. If they are, orient the gasket correctly.
8. Slide the exhaust header onto the bolt studs and secure the bolts into place. Use a wrench, as the headers will be closer to the block and a socket will not be small enough to fit.
9. Orient the catalytic-converter ball flange so it matches up with the header ball flange and secure both into place with the old bolts. These bolts must be tight to avoid exhaust leaks.
10. Cut the wire ties that are holding the O2 sensors out of the way and then thread the O2 sensors into the headers with an adjustable wrench.
