4bt

Hi I was wondering which swap I should do. I was originally thinking about the 4bt Cummins swap but then I herd I could do the 6bt swap so I could have more power. I have a 1981 jeep cj7 5 speed lifted 4" with 35in tires. It currently has the 4.2 straight 6 in it. Could you guys tell me what...

I am looking at taking a huge leap and swaping my 4cylinder engine for a 4BT Cummings. I am needing to get just a little bit more info other than what I've been able to find on the net. For starters this is my daily driver and I need to know if this is going to make me unstreet legal or is there...