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258 to 4.5 swap

Swaping 258 to 4.0, 4.0 parts to 258 etc!
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chris1977
Posts: 2
Joined: January 29th, 2020, 12:01 am
Stroker Displacement: 258ci
Vehicle Year: 1985
Vehicle Make: jeep
Vehicle Model: cj7

258 to 4.5 swap

Post by chris1977 » January 29th, 2020, 12:21 am

I have the chance to buy a low mile hesco built 4.5 to drop in my cj. But I am all ready set up with Holley sniper and hyper spark on my 258. I would like to keep using these systems. Is it possible or worth it. what will it take to mount the distributer where the oil pump is. will the current cam gear drive it?

dirtdudeaz
Posts: 5
Joined: April 12th, 2017, 1:12 pm
Stroker Displacement: 4.7
Vehicle Year: 1983
Vehicle Make: Jeep
Vehicle Model: CJ7

Re: 258 to 4.5 swap

Post by dirtdudeaz » January 29th, 2020, 2:49 pm

Yes it's possible. You'd be losing a lot of efficiency and better fueling with the MPFI on the 4.0's, but you could put the 258 intake back on. The build would be the same as doing the 4.0 head swap when it comes to the intake/exhaust/accessories.

If it's a good deal; why not buy it and store it, play with your injected 258 for a while, and when you get bored, swap it out?

chris1977
Posts: 2
Joined: January 29th, 2020, 12:01 am
Stroker Displacement: 258ci
Vehicle Year: 1985
Vehicle Make: jeep
Vehicle Model: cj7

Re: 258 to 4.5 swap

Post by chris1977 » January 30th, 2020, 1:13 am

That's what I'm thinking but what about the distributor mount and oil pump

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