C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Build thread: LS into 1975 Convertible

Thread Tools
 
Search this Thread
 
Old Dec 6, 2011 | 10:27 AM
  #21  
Quil's Avatar
Quil
Thread Starter
Drifting
15 Year Member
All Eyes On Me
Photogenic
Liked
 
Joined: Dec 2007
Posts: 1,309
Likes: 24
From: Coastal Georgia
C2 of the Year Finalist - Modified 2020
Default

Originally Posted by Garys 68
I've had mine done for a couple yerars, very happy with it.
I bought an LQ9 because of price and that exhaust and a tune alone put it over 400hp. Keep in mind f body LS1s have not been made for 10 years. I tend to question low milage claims on those motors.
I went with a Richmond 6 speed and it's just plain fun to drive, go with a manual trans if you can.
So when you went with the LQ9, you just had to piece together the accessories, an intake/rails/injectors, trans, and harness? This seems like a pretty viable option, especially considering I could potentially source an LQ9 short block, and then top it off with a set of LS6 heads and intake setup...then source the F-body accessories, get a harness and pcm, pick up a small cam, and locate a set of coils and go to work...

Decisions, decisions....
Reply
Old Dec 6, 2011 | 11:27 AM
  #22  
Garys 68's Avatar
Garys 68
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Sep 2004
Posts: 2,655
Likes: 19
Default

I only had alternator and AC, so I made my own brackets with truck spacing. I did use an LS1 intake ($35 with fuel rail). You can use the truck injectors with aftermarket fuel rails too.
Batwing corvette oil pan $100 and 02 covette exhaust $40. Fits nicely.
Reply
Old Dec 6, 2011 | 11:57 AM
  #23  
Quil's Avatar
Quil
Thread Starter
Drifting
15 Year Member
All Eyes On Me
Photogenic
Liked
 
Joined: Dec 2007
Posts: 1,309
Likes: 24
From: Coastal Georgia
C2 of the Year Finalist - Modified 2020
Default

Ok good deal, thanks for the pic. I just have to do the power steering and alternator...no A/C...so I suppose it would be easy enough to source those items.

What did you guys do for gauges? Use your stock ones? Cable-X box for the speedo?
Reply
Old Dec 6, 2011 | 12:17 PM
  #24  
Garys 68's Avatar
Garys 68
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Sep 2004
Posts: 2,655
Likes: 19
Default

Center console gauges are all stock. I drilled and tapped the drivers side brass block plug for the 68s 1/2" NPT sender.
Speedo is stock. Richmond 6 speed has a mechanical output.
Tach is converted to electric. I had an Isspro tach in the basement with the same sweep and even same faceplate screw positions. Gutted it, mounted in the vette housing, reused the 68 face and needle.
Btw, you can buy a PS/Alternator bracket for vette, f body, or truck spacing from Kwik.

Last edited by Garys 68; Dec 6, 2011 at 12:19 PM.
Reply
Old Dec 6, 2011 | 01:20 PM
  #25  
72LS1Vette's Avatar
72LS1Vette
Safety Car
20 Year Member
 
Joined: Aug 2001
Posts: 4,883
Likes: 11
From: North Easton Mass
Default

Originally Posted by Quil
Ok good deal, thanks for the pic. I just have to do the power steering and alternator...no A/C...so I suppose it would be easy enough to source those items.

What did you guys do for gauges? Use your stock ones? Cable-X box for the speedo?
I use all of the original gauges. Cable-X box between the T56 and speedo, a 75 electric tach that I swapped faces for the 72, and I tapped the fitting above the oil filter for the mechanical oil pressure gauge.

The ECU has to be reprogrammed for the tach pulse count to be correct. I haven't done that yet so my tach is reading ~1/2 of true rpms.



Rick B.
Reply
Old Jan 14, 2012 | 08:36 PM
  #26  
Quil's Avatar
Quil
Thread Starter
Drifting
15 Year Member
All Eyes On Me
Photogenic
Liked
 
Joined: Dec 2007
Posts: 1,309
Likes: 24
From: Coastal Georgia
C2 of the Year Finalist - Modified 2020
Default

OK, so it took a while, but I finally sold off all the GEN I stuff today, and I'm off to look at a 2000 LS1 with T56 tomorrow. Time to start buying some parts. Back in the game! Stay tuned.
Reply
Old Jan 14, 2012 | 08:53 PM
  #27  
riggs 74's Avatar
riggs 74
Drifting
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Oct 2008
Posts: 1,496
Likes: 6
From: springfield ohio
Default

Are you planning to rebuild an older motor, or is it with low low miles? I would spend the extra coins to get a newer low mileage motor. Don't forget there are some great buys on near new Iron block motors out there, the difference between an aluminum and an Iron motor is like 60 pounds in weight. You would have to change out the intake, unless you are running a raised hood, due to the taller intakes.

You might even find a newer Carmaro motor for a great buy. I could go on and on, but I'm just trying to through some Ideals out there, I believe a lot of people jump on what ever they come across before they really look to see what's on the market, and the market seems to change daily.

Good luck, I hope you find a deal.

Riggs
Reply
Old Jan 14, 2012 | 09:09 PM
  #28  
Quil's Avatar
Quil
Thread Starter
Drifting
15 Year Member
All Eyes On Me
Photogenic
Liked
 
Joined: Dec 2007
Posts: 1,309
Likes: 24
From: Coastal Georgia
C2 of the Year Finalist - Modified 2020
Default

Thanks for the advice. The motor and trans, along with a ton of other parts, belong to a friend of mine. He bought a wrecked car at auction with the intention on using the engine and trans but never got around to it. He's giving me a steal on everything I want from the car.

I have to be as budget minded as possible with this build, since I know in the long run it is going to nickel and dime me to death. That doesn't mean I'm going to go out and buy a motor with a ton of miles or the first thing I see, but this deal is truly going to put me way ahead of where I thought I'd be at this point.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-1

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-2

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-3

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-4

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
story-5

5 MOST and 5 LEAST Popular Corvette Model Years in History!

 Joe Kucinski
story-6

2027 Corvette Buyer's Guide: Everything You Need to Know!

 Joe Kucinski
story-7

10 Things C8 Corvette Owners Hate (But Won't Tell You)

 Joe Kucinski
story-8

10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

 Brett Foote
story-9

Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

 Joe Kucinski
Old Jan 20, 2012 | 10:35 PM
  #29  
Quil's Avatar
Quil
Thread Starter
Drifting
15 Year Member
All Eyes On Me
Photogenic
Liked
 
Joined: Dec 2007
Posts: 1,309
Likes: 24
From: Coastal Georgia
C2 of the Year Finalist - Modified 2020
Default

I'm finally rolling on the project. I have an LS1 with a T56 that will be going into the car. Starting to purchase parts needed for the swap and complete small projects, one at a time.

I finished with an engine bay cleaning and repaint tonight. Tomorrow, I start pulling the interior out to do the necessary mods under the dash, and also lay down some heat shielding and sound deadener throughout the interior. I have a manual trans pedal setup on the way to me, so I'll be getting that mounted up and getting the clutch master cylinder and lines worked out...which leads me to a question...

I had PM'd and emailed Josh at Custom Image in regards to a set of his mounts and also his clutch master cylinder, but I haven't heard back from him all week. I'm sure he's busy, and I should probably call him. But does anyone else make a bracket that mounts a standard F-body or vette clutch master cylinder at the correct angle to line up with the C3 pedals? I know I saw one somewhere online, but I can't for the life of me remember where.

Also need a little clarification on which motor mounts to go with. Like I said...was going to go with the Custom Image mounts, but just in case...which other mounts sit the motor back an inch and won't necessitate clearance of the alternator or crossmember?

Thanks guys. More pics soon.
Reply
Old Jan 20, 2012 | 11:29 PM
  #30  
SMSRACEENGINES's Avatar
SMSRACEENGINES
Intermediate
20 Year Member
 
Joined: Mar 2001
Posts: 32
Likes: 0
From: CHILDERSBURG Alabama
Default

Your car looks Great Good Luck with your swap. I just finished my 74 convertable with an LS6 and a 4l60e.
Reply
Old Jan 20, 2012 | 11:43 PM
  #31  
Vette5.5's Avatar
Vette5.5
Le Mans Master
 
Joined: Sep 2004
Posts: 5,116
Likes: 5
From: Livonia MI
Default

Man, hope you know what you're doing, as a well set up 406 is one hell of a motor. I had a factory LS1 6 speed C5 that was pretty nice, with good fuel milage, but no match performance wise to some with well built 406's. My current Vette's a C6 LS7 car, and this one really impresses. If I was going through all the trouble of a conversion, probably go LS2 or 3.
Reply
Old Jan 21, 2012 | 10:01 AM
  #32  
riggs 74's Avatar
riggs 74
Drifting
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Oct 2008
Posts: 1,496
Likes: 6
From: springfield ohio
Default

Quil, I would try Josh again by way of Email several times, they probably get lost through the spam filter, I have had this happen with alot of vender's that I have used. If you could call him, that would be the best route to go.

Since I have an automatic trans setup I'm not sure of what plates work, so I will let some one else chime in. I know Gordonm is running a Manual trans LS setup, He could setup you up in the right direction.



Riggs
Reply
Old Jan 21, 2012 | 10:32 AM
  #33  
Gordonm's Avatar
Gordonm
Race Director
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Default

I was able to get the bracket tha tKeisler uses for their hyd clutch setup. I just got the bracket and am using a Tilton MC for the clutch and TO bearing. It is angled perfectly and works very well. I am using the LS style TO bearing that is on the front of the transmission.
Reply
Old Jan 21, 2012 | 04:25 PM
  #34  
Quil's Avatar
Quil
Thread Starter
Drifting
15 Year Member
All Eyes On Me
Photogenic
Liked
 
Joined: Dec 2007
Posts: 1,309
Likes: 24
From: Coastal Georgia
C2 of the Year Finalist - Modified 2020
Default

Got quite a bit done today so far. Spent most of my time getting the interior removed and a little final touch up on the engine bay. Still have to sand and repaint the brake booster and do something with the master cylinder...



Masking tape is still in place, but you get the idea. Looks a lot better than before...



Look closely and you'll see the original color of the car...



And here's a shot of the new motor and trans. I'll start pulling everything off and get it prepped for paint. I'll also be sending the harness off to Speartech (probably) to have them rework it for me. I also have a new LS2 timing kit (chain, sprockets, etc) on the way, and will be ordering an LS6 oil pump to install before the motor goes in. I'm also debating going ahead with a small cam and valvesprings as well...will depend on how the finances look when everything starts shaking out. Anyways...

Reply
Old Jan 21, 2012 | 06:25 PM
  #35  
riggs 74's Avatar
riggs 74
Drifting
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Oct 2008
Posts: 1,496
Likes: 6
From: springfield ohio
Default

If you detail the LS like you're doing the engine bay, It's going to look very nice.


Riggs.
Reply
Old Jan 21, 2012 | 07:30 PM
  #36  
Gordonm's Avatar
Gordonm
Race Director
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Default

Do the cam swap. The LS motors respond very well to a better cam. Yes it a little extra, but you will be rewarded with better performance.
Reply
Old Jan 21, 2012 | 07:38 PM
  #37  
Quil's Avatar
Quil
Thread Starter
Drifting
15 Year Member
All Eyes On Me
Photogenic
Liked
 
Joined: Dec 2007
Posts: 1,309
Likes: 24
From: Coastal Georgia
C2 of the Year Finalist - Modified 2020
Default

Originally Posted by riggs 74
If you detail the LS like you're doing the engine bay, It's going to look very nice.


Riggs.
Thanks. I'm trying to take my time and do this right...don't want to get in a position down the road where I pop the hood and say, "Man I wish I had done X when the engine was out."

Here's a pic of the last LS6 intake I painted. Not sure if I want to go with this color again, or a different one. Thinking about carbon black, with the metal flake, or maybe gloss black...





Originally Posted by Gordonm
Do the cam swap. The LS motors respond very well to a better cam. Yes it a little extra, but you will be rewarded with better performance.
No doubt its worth the money. I'm actually a lot more experienced with the LS engines than I am the conventional Gen I SBC...this will be my 6th LSx car. I'm thinking something small for now, like a 224 or 228R style cam...maybe a Hot Cam if I come into a deal on one. Something like that. Would probably be a good move to get some new valve springs in there anyways.
Reply

Get notified of new replies

To Build thread: LS into 1975 Convertible

Old Jan 21, 2012 | 07:40 PM
  #38  
Quil's Avatar
Quil
Thread Starter
Drifting
15 Year Member
All Eyes On Me
Photogenic
Liked
 
Joined: Dec 2007
Posts: 1,309
Likes: 24
From: Coastal Georgia
C2 of the Year Finalist - Modified 2020
Default

Got the wiring harness off and labeled tonight. I'm debating whether or not to try to modify this thing myself, or just pony up the money and send it out and then get it back ready to go with relays, fuses, OBDII connector, etc.

Tomorrow I pull off the AIR, EGR, manifolds, etc. Will probably go ahead and pull the intake, and pop the valve covers as well to inspect.
Reply
Old Jan 21, 2012 | 08:59 PM
  #39  
riggs 74's Avatar
riggs 74
Drifting
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Oct 2008
Posts: 1,496
Likes: 6
From: springfield ohio
Default

Originally Posted by Quil
Thanks. I'm trying to take my time and do this right...don't want to get in a position down the road where I pop the hood and say, "Man I wish I had done X when the engine was out."
That's the same thoughts I had when I started mine. The only thought I have now is that I should have pulled the body and painted the frame, Oh well, I can do that in the years to come, mine is more of a driver then it is a show piece any ways.

Riggs.
Reply
Old Jan 22, 2012 | 08:55 AM
  #40  
Garys 68's Avatar
Garys 68
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Sep 2004
Posts: 2,655
Likes: 19
Default

I sent my first harness out. The second one, I did myself. Not too difficult with help from this site.
http://www.lt1swap.com/2000harness.htm
Reply



All times are GMT -4. The time now is 10:19 PM.

story-0
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-1
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-2
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-3
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-4
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-5
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-6
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE
story-7
10 Things C8 Corvette Owners Hate (But Won't Tell You)

Slideshow: 10 things C8 Corvette owners hate, but won't tell you.

By Joe Kucinski | 2026-04-01 18:36:07


VIEW MORE
story-8
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

Slideshow: Should you add one of these incredible Corvettes to your garage?

By Brett Foote | 2026-04-01 18:14:05


VIEW MORE
story-9
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

Slideshow: Every Corvette Grand Sport explained

By Joe Kucinski | 2026-03-26 07:13:44


VIEW MORE