Welcome to www.JeepStrokers.com!!
Not yet a registered user? You are required to Register before you can post within this topic.

0331 head to... what?

Swaping 258 to 4.0, 4.0 parts to 258 etc!
Post Reply
User avatar
derf
Posts: 6
Joined: November 23rd, 2020, 9:12 am
Stroker Displacement: 242
Vehicle Year: 1987
Vehicle Make: Jeep
Vehicle Model: Comanche
Contact:

0331 head to... what?

Post by derf » January 6th, 2021, 12:05 pm

I'm getting close to needing to rebuild the 4.0 in my 01 XJ. I've already checked it and it has the 0331 head that is not stamped with TUPY. So I know that even though it's holding together at 180K miles, it can still let go. But I also have a rod knock and that's going to need to be addressed. So I'm looking at building up a stroker ahead of time and doing the swap over a weekend if I can.

I've been researching the 4.0 for a while and I have a handle on the different blocks and heads that came over the years. I've done some searching and I see that I can pretty much find any type of donor I want for a reasonable price.

I live in an emissions county in Colorado (and moving is not an option). I'll need to pass smog checks and that does limit me just a little. But it's unlikely a minor change like a head will even be noticed, much less the longer crank inside. So I do have a little bit of flexibility. Maybe even enough to get away with the Viper coil mod.

I am going to have to replace the cracked exhaust manifold so I do have the option of going with a different manifold to match something like an 0630 head.

My goal for this stroker is to have a reliable long term engine. I don't need tons of power out of it. The extra power from a mild/moderate stroker build will be more than enough for this vehicle. It's a driver that never gets pushed hard.

Is there an advantage to going with the 0630 head over the smaller port 0331/TUPY head? Are there better choices? Given all options on the table, what direction would you go?
1987 MJ project: 4.6/AW4/ORD Magnum Box/Ford NP205/Dana Super 60/Dana 80/40's
2001 XJ: 4.0/AW4/NP242/D30/D44/32's
My gear ratio calculator: http://www.grimmjeeper.com/gears.html

User avatar
bleedsblue
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 49
Joined: December 18th, 2020, 11:35 am
Vehicle Year: 2003
Vehicle Make: Jeep
Vehicle Model: Grand Cher

Re: 0331 head to... what?

Post by bleedsblue » January 7th, 2021, 5:34 pm

While I cant give you a lot of technical advice about which head will be better for you, I do have a 0331 Tupy head sitting on the floor in my garage that I am not going to be using if you find yourself making it next door to Utah. I am currently building my stroker as we speak. The block is at the machine shop. I have to keep my emissions as well so I am getting a worked over Tupy head from Russ Pottenger to run the stock cats.

Good luck!

Russ Pottenger
Strong Poster
Strong Poster
Posts: 827
Joined: August 15th, 2009, 1:27 am
Stroker Displacement: 4.7
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: 0331 head to... what?

Post by Russ Pottenger » April 10th, 2021, 1:25 pm

As mentioned a TUPY or a new 0331 head that I sell at $450.00 wouldn’t be a bad choice.

A 0630 Will work as long as you upgrade your header and fab up something to hold your coil packs.

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests