C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1985 C4 LQ4/4L60E conversion

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Old Apr 26, 2020 | 12:38 PM
  #81  
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Originally Posted by Krusty84
I read through and searched this thread the best I could. Are you putting a stall converter in this?
The torque plateau with your cam is going to start in the 3800+ rpm area range so a stock truck converter is going to be a big slouch in this much lighter vehicle.
My 5spd '84 LQ9 w/ LS3 heads & 220/224 cam puts down over 400 rwtq from 4100-5300 rpm.
I'll definitely be going with a high stall, somewhere around 3000-3200. I haven't yet entered into the transmission phase yet although I did take it apart to make it easier for test fitting. I'm getting close to finishing the engine to the point where I can install it so hopefully in the next week or two i can get into the 4L60E rebuild. If anyone has suggestions on rebuild kits I'm all ears. I've looked at summit, TCI and there's a kit on Amazon that is a full Alto kit i have on my wish list. Also considering changing the gear ratios to the 2.84 first gear, Sonnax makes the planetaries to make it happen but they're around $750 so idk if it makes sense for the cost.
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Old Apr 26, 2020 | 04:10 PM
  #82  
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That is going to be a fun car. Should hit real hard with a 3000+ stall.
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Old Apr 27, 2020 | 08:41 AM
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Originally Posted by Krusty84
That is going to be a fun car. Should hit real hard with a 3000+ stall.
I used a 3000 stall in my Trans Am with the 383 and it was one of the best upgrades I've ever done. Off the line is fun for sure!

I was able to get the heads on last night after painting the block, removing a broken stud and drill and tap for the 85 temp sensor. Tossed on the intake for the photo op. Making progress!


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Old Apr 27, 2020 | 08:45 AM
  #84  
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To get the stud out I welded a nut on to the stud. The weld didnt hold to the nut but the stud did turn a little before the nut broke off. I then used vice grip pliers to turn it out. Saved $60 which is what the machine shop wanted to charge.
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Old May 2, 2020 | 06:57 PM
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Cheap Amazon headers fit well and test fitting the Holley O2 sensor seems to fit either side so I got options. Just pulled out the main harness that connects on the driver side for cleanup, rewire and wrap. Anyone have ideas on how to connect a C5 alternator to a C4 harness?
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Old May 2, 2020 | 07:10 PM
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You will likely have to move the location of the passenger side o2 sensor. It is a tight fit. If you only need one o2 sensor the drive's side is in a great location.
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Old May 2, 2020 | 10:53 PM
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That LS is looking mighty fine!
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Old May 3, 2020 | 11:20 AM
  #88  
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Wow Bandit, your making some pretty decent progress. Those headers are going to have to adjusted (modified) as they will come into contact with your 4L65 transmission. C5/C6 have the transmission at the rear of the car and there is a bell housing/torque tube at the rear of the engine. I think Kusty has some pictures to show you the required mods. I ran shortie headers with 3in exhaust, so mine fit pretty easy.
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Old May 3, 2020 | 02:11 PM
  #89  
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Yep I read through another link authored by pwnage where he modded his cheapie headers and that's where I got the idea. I'm hoping to not have to ding them like he did since they are "stainless" (we'll see about that) and look nice at the moment.
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Old May 3, 2020 | 07:53 PM
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Considering the cost and limited availability of ls2 injectors i am considering trying ls1 style injectors. Seems like I would only need a spacer of some sort to raise the fuel rail, and my intake came with the larger diameter orings to use on the intake. Anyone have an ls2 intake and tried this?
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Old May 5, 2020 | 09:51 AM
  #91  
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I found a used set of Siemens deka 47lb LS2 injectors on eBay for my offered price of $80. Seller claims they were ultrasonic cleaned and flowed on a ASNU flow bench, hopefully they work well. Should see them Friday or monday.
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Old May 15, 2020 | 08:47 PM
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Ok so not much progress lately. I ordered a TCI Super Master Pro transmission kit hoping to put the trans together this weekend only to find out that it didnt have but 3 bushings and came with a 700R4 shift kit, and no molded pistons. I triple checked my purchase before ordering, oh well I returned at my expense and ordered a full Alto kit I had my eyes on but was wary of buying something like this from Amazon. Pulled the trigger and should be here next week. I did get a Sonnax sun shell along with pinless pistons for the accumulators, 2nd shift and 4th shift pistons, and the .500 boost valve and a new pump 13 vane kit. I did get some stuff cleaned up so at this point i'm waiting. Gives me time to sort thru wiring and clean up the engine bay

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Old May 16, 2020 | 07:34 PM
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Old May 16, 2020 | 10:02 PM
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Surprise! My alto kit came this morning, wasn't due til late next week so while my wife and daughter went to the produce market i got to work. I was able to assemble the input drum clutches and clean and reassemble the valve body and get all the bushings pressed in. I am very impressed with this kit so far and it comes with the 9 friction 3-4 clutch pack which also makes me happy. Clearance is good with about .032" . I did however manage to destroy the reverse input clutch seals before I figured out a good way to install that piston. New seals will be here Tuesday and I'll detail how I got it in at that point. I am hoping to finish the trans by the end of next week, paint it and then consider buying a $500 torque convertor.
​​​
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Old May 16, 2020 | 10:23 PM
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Some pics from today


Valve body layout

Valve body layout

Input drum assembled for the second time both the video I watched and haynes manual were for different versions but I eventually figured it out
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Old May 17, 2020 | 12:03 AM
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Looking good, I have major respect for you doing your own trans work, that is something I never wanted to try.
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Old May 18, 2020 | 05:37 PM
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Originally Posted by DMITTZ
Looking good, I have major respect for you doing your own trans work, that is something I never wanted to try.
Thank you, it's really not too difficult, just have to put it back together in reverse of disassembly and there's a few things to check such as clutch plate clearances, planet gears, and a few others. Some of the check ***** can wedge themselves into the separator plate, one on this one was almost about to do that so I bought a kit to fix that as well.
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Old May 18, 2020 | 10:38 PM
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Man. We really need a c4 forum swap category to contain all of this awesomeness.

This topic really makes me want to get a gen V 5.3/6.2 with a 10 speed and do a swap. It wouldn't hurt my feelings to see a gen 3 ford 5.0 swap with a 10 speed either.
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Old May 19, 2020 | 07:24 PM
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Originally Posted by Krusty84


Man. We really need a c4 forum swap category to contain all of this awesomeness.

This topic really makes me want to get a gen V 5.3/6.2 with a 10 speed and do a swap. It wouldn't hurt my feelings to see a gen 3 ford 5.0 swap with a 10 speed either.
I agree my friend, I may not post every single detail but I will post some vitals lol and yes I considered an LS swap for my 81 trans am. It even had a large hole in the firewall for electronics that I welded up and smoothed over, would've been perfect for this type of deal. Maybe in the future......
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Old May 19, 2020 | 07:37 PM
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Irritating update. Found a crack in the low reverse clutch piston at lunch (working from home has some benefits) confirmed the crack by checking it with a pair of pliers. IDK what the impact would be if I installed as is but not taking chances here. Found a good used one for 19 bucks on ebay, was supposed to deliver this Saturday but their server was down for a few hours and when it came back up it said next Tuesday. If I have to wait til Tuesday so be it, just glad I found the crack before something bad happened 👌

Seal crack was much wider before I squeezed it with pliers

This imperfection is what made me take a closer look
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