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Old 05-19-2013, 12:47 PM   #31
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Just had a thought while turning wrenches....

Question, 98 5.7 vortec. Does this have straight or angled plugs??? Was looking a headers last night an wanted to mk sure that I get the right ones...

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Old 05-19-2013, 01:49 PM   #32
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Just had a thought while turning wrenches....

Question, 98 5.7 vortec. Does this have straight or angled plugs??? Was looking a headers last night an wanted to mk sure that I get the right ones...
Straight plugs. I have a Tahoe and Yukon, 96 and 99, all the Poppet Injector Vortec engines are straight plug.

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Old 05-19-2013, 03:01 PM   #33
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Great! Thx for the info!
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Old 05-21-2013, 10:05 PM   #34
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Hey guys, I'm startn to think a lil different rite now.
I've been pricing an looking around, I can buy a brand new, not re-man, sbc from a preformance shop near home for 1,300$ free shipping. I'm thinking of going that route instead of a rebuild. I could almost buy two for the price of just the rebuild!!!
What's y'all thoughts on that???
It's a 260hp/350ft# sbc350. Basically a replacement motor for an 80's an early 90's model trucks.
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Old 05-22-2013, 05:48 AM   #35
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Keep in mind that that is just probably a SHORT BLOCK, no accessories, or heads or anything like that.

Also, Its a GM 5.7 If you want to save money, clean the engine up and put it in. Unless you are for sure it has a rod knocking or some other catastrophic failure, I wouldn't even rebuilt it man. If its not broken, don't fix it.

Just clean it up very nice, and take your time and go with the fuel injection. You will be proud that you did the electronics and didn't wimp out and throw on a carb like everyone else who is a sissy.
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Old 05-22-2013, 08:21 AM   #36
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Yea the donor I was able to get is a 98 gmc z71. Got it for 200$ but oil pump went out an motor locked up. Needs a rebuild. I can part out truck r sell it to get $ bk for it but the trans, front an rear diff's r good, an ill pull all the external stuff off cuz it's all 2 mths old.
The motor I found is new, new block, heads etc.
just need to install an intake an dizzy, headers. Etc.
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Old 05-22-2013, 09:36 AM   #37
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Also I'm def goin with FI, if I buy that new motor, im def going to look into it more cause I'm not sure if ill beable to use the vortec intake. I may have to find a throttle body injection. Still better than a carb!
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Old 05-22-2013, 12:53 PM   #38
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I would just look into buying an older truck for all the donor parts you need. I'm getting ready to do a 350 swap I bought a 64' chevy with a 350, dana 4wd transfer case and muncie 4 speed transmisson for 500 dollars. I believe thats the easiest way that way you wont need bellhousing adapters that set you back 300 dollars.

P.s. Carbs are #1
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Old 05-22-2013, 06:00 PM   #39
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The blocks themselves are the same. You will just need to use vortec heads. Then get gaskets and swap everything over.

Don't listen to people doing carbs. A lot of them lack the intelligence to wire a fuel injection system swap.
I would make sure you pick up a drivers drop D44 or gm 10 bolt, and then swap in the rear axle out of that Chevy.
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Old 05-22-2013, 10:30 PM   #40
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Just finished up making my purchase!!! Found a 1995 TBI 350 with 58,000 mi on it. Everything works an runs. Shipped to my home, 600$. 450 for complete motor an 150$ shipping! Going to use dat 98 gmc in my yard for other things..... Rear end an trans mabe, if my ax15 gives up. But not sure yet. Just need to get it my jeep then ill figure out da rest!!! Lol gettn very very excited!
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Old 05-23-2013, 06:46 AM   #41
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Okay, send me a picture of the white sticker on the ECU when you get it. I have all of the wiring diagrams from my 1995 TBI swap.

It was a pain, but it was fun and I never got any check engine lights either even though I cut so much crap out of the wiring harness.
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Old 05-23-2013, 09:44 PM   #42
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Ok will do. It should ship tomorrow so I'm hoping to have it by Tuesday r Wednesday
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Old 05-24-2013, 11:05 PM   #43
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Motor is almost out! Ill post up pics in an hr r so. Bout to hook it up to my tractor an lift it out with da bucket!!!
My 350 will be here Tuesday! Can't wait!!
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Old 05-25-2013, 01:19 AM   #44
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Motor is out finally! Kinda a beeitch to do by yourself! Lol but I got it finally!

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Old 05-25-2013, 01:20 AM   #45
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Now it's time to clean up the frame an engine bay an get it ready for the new heart transplant!
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Old 05-25-2013, 07:39 AM   #46
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You will need this radiator, then add a fan to it.
GPI New Jeep Wrangler TJ YJ 3 Row Aluminum Radiator V8 Conversion 87 95 97 02 | eBay

This is also a popular and recommended choice for the GM motor mounts:Chevy 283-350 into Jeep YJ Wrangler- Crossmember & Mount Kit | Northern Auto Parts

And here are the MORE bombproof most recommended motor mounts, May find a better price elsewhere but they are PN: JM400
http://www.summitracing.com/parts/mre-jm400
Also, I would recommend using the oil cooler adapter (if your TBI engine has one, mine did) and run an oil cooler up front of the radiator.
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Old 05-25-2013, 10:51 AM   #47
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Thx for the info!

Do you think I have to have the style headers like in the link you posted or can these work???

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Old 05-25-2013, 10:59 AM   #48
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I originally was going to use the exact same headers you have there, and they SHOULD work.

The issue of why I wasn't able to use them in my V8 yj is because when the idiot who originally put a V8 in it did the mount perches on the frame rail, welded the driver side mount 3/4" farther back and caused the driver header to hit the mount. The passenger side fit perfectly, except you may have to figure out something for your knock sensor because I think the flange will sit on it or REALLY close to it.
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Old 05-25-2013, 11:53 AM   #49
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Great! Cuz that is way cheaper than anything else i found. I know everything isn't cheap but not tryn to spend too much as I've just found out I'm having twins so I'm now on a time crunch of sort. An tryn to not splurge too much now.
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Old 05-25-2013, 03:36 PM   #50
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Did you ever look at my V8 build thread?

Congratulations on the twins by the way!
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Old 05-25-2013, 03:58 PM   #51
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No I sure haven't.

An thx!!! It was a hell of a surprise! It's great though!
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Old 05-25-2013, 05:10 PM   #52
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Can any one tell me wtf is this box for???? I'm clueless!

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It's mounted on the firewall under the bulkhead connector.
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Old 05-25-2013, 11:03 PM   #53
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Can any one tell me wtf is this box for???? I'm clueless!

Attachment 253466

It's mounted on the firewall under the bulkhead connector.

Thats part of a UNEO Security system. Must not be very popular, or went out of business long ago because I can't find anything on the internet for them.

Also, the fuel pump you need you use is a Holey Blue pump. It is 130gph and 14psi.
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Old 05-25-2013, 11:30 PM   #54
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Security sys......????? Dam! I searched for an hr today an came up wit nutn. Was just wondern before I pulled it out lol.

An cool thanks. I was wondern what pump an pressure I needed to get. It worked out good for u so far?
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Old 05-25-2013, 11:37 PM   #55
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Yes, the TBI system only runs 13-15psi of fuel pressure. You want the GPH there so that it feeds the engine at WOT.

You WILL need to build a return line into your fuel system. Not a big deal, just make sure you do it.
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Old 05-25-2013, 11:51 PM   #56
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Ok. I still have the factory feed an return lines going to the tank. I also just soldered new fittings in because I had to replace my sender an aftermarket of corse didn't fit. Had to cut up a piece of aluminum an epoxy an soider new fittings.
Will the fact. lines be enuff to feed that motor?? R ima have to go bigger?
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Old 05-26-2013, 08:36 AM   #57
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They should be enough.

The amount of return flow is actually quite minimal.
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Old 05-26-2013, 02:00 PM   #58
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Should I cut out old motor mounts on frame now r wait till I get my new ones in??? I'm going to go with a weld on mount, almost sure of it.
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Old 05-26-2013, 02:22 PM   #59
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Should I cut out old motor mounts on frame now r wait till I get my new ones in??? I'm going to go with a weld on mount, almost sure of it.
Personally, I would have bought all this stuff already, but I hear MORE makes a nice weld in set that is all set up for the perfect smalblock Chevy engine location already in mind.

Jeep Motor Mounts YJ Wrangler Converting to Chevy V-8 (small or big block) engines from Mountain Off-Road (M.O.R.E.)

I was going to buy these before I decided to stick with a Dodge 5.2L
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Old 05-26-2013, 02:31 PM   #60
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I was goin to be taking this project a lil slower, but, I've recieved great news that my wife is preg. An we r having twins! So now I'm tryn to grab all stuff needed to get it done, an askn questions at the same time lol. The only thing I have left to get is my mounts an my trans adpt. kit from advance adapters. O, an my fuel pump.
I know I'm prob going at it a lil backward, but now I'm limited on time an funds to get it done. Only got a couple months to play, before my little ones get here!

An I just started ordering my stuff yesterday to complete this.

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