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5.7 Motor Help & LS Motor Swap Info

Re: 5.7 Motor Help

Matt O. said:
The burnt spot is on the plug boots. One boot on each side of the block, so two total. I will go ahead and get a tune up kit and start with that as it is about time for it anyways.



Those block bugger headers are a bit h about burning the middle 2 boots. Are you running 90 degree boots or straights?
 
Re: 5.7 Motor Help

CHASMAN9 said:
Those block bugger headers are a bit h about burning the middle 2 boots. Are you running 90 degree boots or straights?

I have 90's at the block, straight at the dist.
 
Re: 5.7 Motor Help

Matt O. said:
I have 90's at the block, straight at the dist.


That's what I was running and burning the hell out of 90's. I called Taylor and they sent me 4-120* boots and I wrapped them with those High Heat boot wraps and is working much better. I could not get those wraps around the 90's properly fit, so changing them to 120's allowed the insulators to be more useful. It was always the two middle cylinders on both sides. thumb.gif
 
Re: 5.7 Motor Help

I have new plugs, wires, dist cap and rotor on the way. It is time for a tune up anyways and with the bad places I have in my wire boots it may be my problem. Also waiting on a fuel pressure gauge so I can test that. Talked to Jim's Performance he did my tune and he gave me some more ideas. Tried unplugging the MAF to see how it would act and it was the same if not worse, so I think it can be ruled out. He said TPS would be his next thing to check after a tune up, then the injection system last as this SFI poplet crap is notorious for failing.
 
Re: 5.7 Motor Help

Matt O. said:
I have new plugs, wires, dist cap and rotor on the way. It is time for a tune up anyways and with the bad places I have in my wire boots it may be my problem. Also waiting on a fuel pressure gauge so I can test that. Talked to Jim's Performance he did my tune and he gave me some more ideas. Tried unplugging the MAF to see how it would act and it was the same if not worse, so I think it can be ruled out. He said TPS would be his next thing to check after a tune up, then the injection system last as this SFI poplet crap is notorious for failing.


I got to believe that if at idle it runs fine, then its in the boots. Pull one of the burnt boots off the motor while its running and see. thumb.gif

This also works if you spit on your finger and place it on one of the wires in question. :eek: :eek: :eek:
 
Re: 5.7 Motor Help

SOMETIMES,if the mass air flow sensor is in qustion,you can tap on the MAF with a screwdriver or something and make it act up.
Also if you have a KN filter you need to watch how much oil you put on it.If you put too much it will get on the MAF and cause problems. :dunno:
 
Re: 5.7 Motor Help

Cole said:
Just put a 5.3 in it or a ls1. Quit wasting money on this motor.

Cannot do at this moment, definately saving up for one. My problem is that as far forward as my motor sits an LS1 is all that will work and it is the most expensive to find. Hope to do something about the motor by year end.
 
Re: 5.7 Motor Help

Matt O. said:
Cannot do at this moment, definately saving up for one. My problem is that as far forward as my motor sits an LS1 is all that will work and it is the most expensive to find. Hope to do something about the motor by year end.
why can't u do a 6.0 and swap intake and accessories around like my motor? I'm sure Greg Stone can get u hooked up with a motor for a good price.
 
Re: 5.7 Motor Help

By the time I do that I could of just about bought an ls1 for about the same price. How much do you have in your motor including the pan, car intake, injectors and accessories? The height of my motor is only part of the problem, my real problem is length fo the motor front to back. Since my drivetrain is so far forward I have a very small amount of room to work with and keep a front rad.
 
Re: 5.7 Motor Help

Thanks for all the help guys, after a test run it appears the problem was fixed with a tune up. Several of you guys said plugs and wires and that seems to be it. I checked fuel pressure today and even under load and bogging down it was pulling the no less than 60psi which is right where it should be. Did cap, rotor, plugs and wires and I could not get it to bog down again. Some of the plugs were pretty fouled and the spots on the wire boots were worse than I thought. Anyways thanks for the helps, it seems good for now!
 
Re: 5.7 Motor Help

Matt O. said:
By the time I do that I could of just about bought an ls1 for about the same price. How much do you have in your motor including the pan, car intake, injectors and accessories? The height of my motor is only part of the problem, my real problem is length fo the motor front to back. Since my drivetrain is so far forward I have a very small amount of room to work with and keep a front rad.

I paid around $1800 for my motor with the harness and everything. You can get them cheaper now. $500 for the harness to be cut down, around $400 for the kevko pan, there cheaper now, intake was only $100 off ls1tech.com, injectors were only $50.00 from ls1tech.com, throttle body was aour $75.00, can get on way cheaper now. So I have a little over 3k in my motor.
 
Re: 5.7 Motor Help

By the time I do that I could of just about bought an ls1 for about the same price. How much do you have in your motor including the pan, car intake, injectors and accessories? The height of my motor is only part of the problem, my real problem is length fo the motor front to back. Since my drivetrain is so far forward I have a very small amount of room to work with and keep a front rad.


I paid around $1800 for my motor with the harness and everything. You can get them cheaper now. $500 for the harness to be cut down, around $400 for the kevko pan, there cheaper now, intake was only $100 off ls1tech.com, injectors were only $50.00 from ls1tech.com, throttle body was aour $75.00, can get on way cheaper now. So I have a little over 3k in my motor.
I would go with a 6.0 instead of an ls1. You can get as much if not more power from one with very little money in it. For 700+- a guy in Overland park can reflash with a cam, and put you over the 400hp mark. All the parts like Cole said are online and cheap as hell. I got all my stuff off carpart .com. Most all the LS1 stuff swaps over to the 6.0 and you can upgrade heads for my guess $500 from some corvette dude. I don't really understand what your saying about an Ls motor want fit in your buggy. It should be really close to the same size.Especially if your running some big electric water pump. I think it's speed way that sells adapter brackets that switch from the old mounting pattern to the ls style . I bet you just spent over $200 on that tune up, thats just half of what I paid for one of my 6.0.
 
Re: 5.7 Motor Help

good to hear you got it running good again! one thing about swapping the motors, you will be able to get a pretty nice price for your current motor, so that will help offset the cost once it is out.
the 5.3 should be an option for you. you can build good power with it and you can get one quite a bit cheaper than a LS1 or 6.0. I paid 350 for my motor and harness/ecm. 150 for my LS6 cam/springs, 100 bux for reflash, 500 in getting the heads milled, cam bearings installed and the short block assembled (which I wouldnt have needed to do if I didnt try and swap the cam out on my own and fawk up the bearings....LOL :****:) I did the harness myself, but it doesnt look nearly as good as a new plug and play harness...or as easy to put in. I am not sure how much HP my motor has, but it works pretty damn good to move my heavy rig around. you can swap out the cam to a bigger cam, LS6 intake and build some really good power. my buddy has a pretty hot 5.3 in his rig, need to see if he has video of it yet or we will have some after next weekend.

Brian
 
Re: 5.7 Motor Help

I got $100 in my tune up and peak riding season is coming up and I want to enjoy it. I would love to go with the cheaper 5.3 or 6.0, but again the length of the motor (where it bolts to the trans to the front of the wp). Brad you are right on the size being similar to what I have now, problem is my current motor does not fit hence the remote mount water pump, the vortec style pump would not fit. My accessory drive consists of the crank pulley, alternator and ps pump, and it uses a goofy 2 v-belt setup to make that work.

I fully understand swapping the car intake, injectors and a kevco pan will take care of the height. I really did not know you guys were finding those parts that cheap though, where are you seeing them for those prices? Do you not have to swap over the car accessories also? I thought I read you did? I guess I will measure some this weekend and think of ways to get the rad and fan a little farther forward to give me a few inches of room to work with. I really only need to free up an inch or so.

Here are the dims:



[attachment deleted by admin]
 
Re: 5.7 Motor Help

i can definitely understand just saving for now and getting your motor good to go so you can ride. do you have room to move the drivetrain back an inch or so? remember with the LSx motors you wont have to worry about the dizzy.
might be an option for ya..

Brian
 
Re: 5.7 Motor Help

Yeah I can move the drivetrain back Brian, but man that is is A LOT of work. I would have to do new atlas/tranny mounts, new driveshafts and my 1 piece shaft would be in jeopordy of not working,etc. Just a can of worms. I have about 6-7 inches of tranny in front of my firewall so yeah there is tons of room but lots of money and time. I would probably do a rear radiator before I moved the drivetrain. Would really like to squeeze it in my current setup and not have to change either though.
 
Re: 5.7 Motor Help

http://www.ls1tech.com/forums/parts-classifieds-134/

water pump off an escalade gets you out of the way of the throttle body, or just cut and miter your truck one. Only thing in the way then is the alt through the hood (move to pass side) and the PS pump for the upper link (move it up out of the way, woodlee has brackets, your you can make your own).

I got my last 5.3 for some leg work.
Jims just told me yesterday that he will do my 5.3 harness for $300 with no tranny work.
brain is about $75, pretty standard.
Ben just put a 5.3 with ls6 cam and springs ($150) on the dyno for tuning and ended up over 400 easily. show me a Gen 1 that will put down over 400 for $1000 with brain work. :flipoff1:
 
Re: 5.7 Motor Help

Kelly is that guy close to you in KS? Any plans on coming down here anytime this year. If so I may hit him up. That is good info on the dyno numbers, I think I have found an LS1 intake for free, so I just need rails, TB and injectors of an LS1 also right? Cable of DBW? I have a good cable and pedal setup now that I could reuse with a cable tb.
 
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