Pontiac, Put down the beer and take a step back.
"4.0 swap from a 4 banger in a 90 YJ"
4.0 = 6 cyl
4 banger = 2.5L
You wanna put a 4.0 in a 90 YJ that currently has a 2.5 or are you wanting to swap a 4 banger in to a 90 YJ that currently has a 4.0...and what does any of this have to do with your CJ?
"4.0 swap from a 4 banger in a 90 YJ"
4.0 = 6 cyl
4 banger = 2.5L
You wanna put a 4.0 in a 90 YJ that currently has a 2.5 or are you wanting to swap a 4 banger in to a 90 YJ that currently has a 4.0...and what does any of this have to do with your CJ?