Engine 258 1 bbl to 2 bbl conversion
bcstringer
Jeeper
- Posts
- 24
- Thanks
- 6
- Vehicle(s)
- '72 CJ5, 4.2L 258, T-18, D20, D44, D30
Howdy Jeep-CJ Community,
I've been reading your posts for years via various google searches, but now that my Jeep re-build has started, I'm running into some issues only you experienced CJers can likely help with. My 1972 Jeep CJ5 (v1.0) was my grandfather's and he taught me how to drive it well before I hit puberty. After he passed, my Dad got it and he and I restored it in 1993-94 as project v2.0 for me to drive as my first vehicle in high school. It's been sitting under my parents' house for nearly 30 years and even got completely flooded by Lake Travis in TX.
I just can't let this heirloom die, so almost 30 years later I'm bringing it back to life with project v3.0. I'm replacing the frozen 232 with a stroked 258 and the T-14 with a T-18. I'm upgrading to a 2 bbl Holley Sniper EFI so need to upgrade the stock 1 bbl intake to a 2 bbl intake. I can't find any late '70s model 2 bbl cast iron intakes out there that will marry up with the stock exhaust manifold so I'm going to use an early '80s model 2 bbl aluminum intake with a detached header.
1) I will block off the EGR with a plate, but what do you do with the vacuum ports and water jacket?
2) Has anyone out there with a '70s 1 bbl intake done this conversion to an early to mid '80s 2 bbl intake before that can walk me thru a clear step-by-step?
3) Are there threads or plugs out there that I can purchase to make this easy?
Thanks in advance for any help! Glad to be here with you all in the CJ Matrix.
Thanks,
Cody
I've been reading your posts for years via various google searches, but now that my Jeep re-build has started, I'm running into some issues only you experienced CJers can likely help with. My 1972 Jeep CJ5 (v1.0) was my grandfather's and he taught me how to drive it well before I hit puberty. After he passed, my Dad got it and he and I restored it in 1993-94 as project v2.0 for me to drive as my first vehicle in high school. It's been sitting under my parents' house for nearly 30 years and even got completely flooded by Lake Travis in TX.
I just can't let this heirloom die, so almost 30 years later I'm bringing it back to life with project v3.0. I'm replacing the frozen 232 with a stroked 258 and the T-14 with a T-18. I'm upgrading to a 2 bbl Holley Sniper EFI so need to upgrade the stock 1 bbl intake to a 2 bbl intake. I can't find any late '70s model 2 bbl cast iron intakes out there that will marry up with the stock exhaust manifold so I'm going to use an early '80s model 2 bbl aluminum intake with a detached header.
1) I will block off the EGR with a plate, but what do you do with the vacuum ports and water jacket?
2) Has anyone out there with a '70s 1 bbl intake done this conversion to an early to mid '80s 2 bbl intake before that can walk me thru a clear step-by-step?
3) Are there threads or plugs out there that I can purchase to make this easy?
Thanks in advance for any help! Glad to be here with you all in the CJ Matrix.
Thanks,
Cody