Used a gallon of purple degreaser concentrate, 35 gallon tub, scalding hot tap water and soaked the manifold for an hour. Rinsed it out and then dunked it back in the tub 7 or 8 times. Sprayed some carb cleaner on a tooth brush and scrubbed each runner really good... But quickly rinsed each after applying the carb cleaner since it may not be that good for plastics. After all was said and done, I ran my hand inside the manifold and it was smooth as glass, each runner was spotless, and the tub was full of very brown water. After my third or fourth rinse the water no longer had oil floating on it as it started to pour out the intake runners. Took about 30 minutes for removal, 2 hours of soaking and cleaning, and 30 minutes installed. Total cost was $29 for the tub, degreaser, and fuel line removal donut.
Results are in... Picked up between .3 and .5 mpg on the highway mimicking a trip i did last week. Throttle response feels better... And finally have a piece of mind that my new heads won't be tainted by the old manifold. Here are some picks. One thing that I didn't like was all the dirt and grit that came out of the tub at the very end of pouring it out.. Hum... Maybe kn filters do let more dirt into your engine?!? The jeep was previously driven daily on the dustiest dirt road know to man.
I also threw in a few pics of the port job on the heads compared to the old heads.
Results are in... Picked up between .3 and .5 mpg on the highway mimicking a trip i did last week. Throttle response feels better... And finally have a piece of mind that my new heads won't be tainted by the old manifold. Here are some picks. One thing that I didn't like was all the dirt and grit that came out of the tub at the very end of pouring it out.. Hum... Maybe kn filters do let more dirt into your engine?!? The jeep was previously driven daily on the dustiest dirt road know to man.
I also threw in a few pics of the port job on the heads compared to the old heads.
