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In the process of swapping a 5.7 in my YJ to replace the old and tired 2.5. Have the '97 5.7 vortec out and on an engine stand. Painted, cleaned and replacing some accessories, sensors, etc. I took the MPFI cover off and the intake has a lot of built up black carbon. Photos below. Interesting because it looks like most of the build up is only on the front end more than the back half. What should i reasonably do since i am this far to clean this? Should i even clean it? I don't want to take the entire intake off if i can help it. Also want to be careful to not cause problems down the road and drop a bunch of scrapings into the intake. First engine swap I am doing and it was a great motor coming out of the old family Suburban.

PS - Yes, i'm putting on new valve covers so excuse the messy paint.



 

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Get over it and take the intake off.... even heads if you have too.... MUCH MUCH MUCH easier on the engine stand

That said... you don't have any pics so I'm just guessing on what it looks like...
 

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Get over it and take the intake off.... even heads if you have too.... MUCH MUCH MUCH easier on the engine stand

That said... you don't have any pics so I'm just guessing on what it looks like...
I'd do the above and also, pull the pan. Once the engine is in and running to your satisfaction. I'd run a couple Seafoam treatments through it for the first couple oil changes.

Good Luck, L.M.
 

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If you look for problems you will find them. I agree with this. However, I'd rather find any problems while the engine is on the stand and my Jeep is still drivable. Depending on what problem you might find, using the engine as is might cause greater problems once the engine is installed and being used.

Good Luck, L.M.
 

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Most chevy vortec heads crack as you take them off. You will also need to be very careful with the spider injector as those will most likely break as well and need replacing.
 
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