1969 LT1 Clone
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 1,160
Likes: 3
From: Greensboro NC
1969 LT1 Clone
I know there were only a handfull of dealer modified LT1's in 1969. But now I have a driveway modified L46 350/350 with the LT1 cam, Alum intake and Holley 750 (they used a 780). I havent fired it up yet, but man it looks :cool:. I'll keep you posted on performance. BTW I shrink wrapped the #'s matching carb and intake for any NCRS events (not in my lifetime) but this was an easy low (relatvly) cost and easily reversible mod to the L46.
[Modified by micks69, 1:52 PM 10/7/2002]
[Modified by micks69, 1:53 PM 10/7/2002]
[Modified by micks69, 1:52 PM 10/7/2002]
[Modified by micks69, 1:53 PM 10/7/2002]
Team Owner
Joined: Jun 2001
Posts: 43,136
Likes: 155
From: Thomson Georgia
Re: 1969 LT1 Clone (PrarieShark)
Cool mine is built to the Lt-1 specs as well
http://temp.corvetteforum.net/c3/alw...engineshot.jpg
http://temp.corvetteforum.net/c3/alw...engineshot.jpg
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 1,160
Likes: 3
From: Greensboro NC
Re: 1969 LT1 Clone (SuperFast80)
Superfast80,
Because I want a car that I can do more mods on without ruining the value.
I have found out that I much prefer working on and modding a car than going to cruise nights an ddriving them. And in my opinion a 69 ragtop w/side exhaust and manual brakes and steering isnt much fun to drive anywhere more than 1 1/2 hours. I much prefer my new 02 Z28 for those kind of trips.
Soooo what I'm saying is until I sell her I'm going to keep putzing around with it.
Because I want a car that I can do more mods on without ruining the value.
I have found out that I much prefer working on and modding a car than going to cruise nights an ddriving them. And in my opinion a 69 ragtop w/side exhaust and manual brakes and steering isnt much fun to drive anywhere more than 1 1/2 hours. I much prefer my new 02 Z28 for those kind of trips.
Soooo what I'm saying is until I sell her I'm going to keep putzing around with it.
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Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: 1969 LT1 Clone (micks69)
I like your intake!!! The old "Torkers" and/or "Tarantula TM-1's" are awsome intakes... I have a ported and matched TM-1 on my 465 HP stroker engine...
:cheers:
Olivier
:cheers:
Olivier
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: 1969 LT1 Clone (micks69)
Why are you using a vacuum secondaries carb on this engine... Vacuum secondaries carbs don't work too well with single plane intakes...
:cheers:
Olivier
:cheers:
Olivier
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 1,160
Likes: 3
From: Greensboro NC
Re: 1969 LT1 Clone (GrandSportC3)
Well I'm learning from my mistakes. Here's what I found.
#1 Looks great
#2 Slower than my Q-jet
#3 Car handles diffrent with less weight in front (not sure if I like it or not)
#4 Exhaust smell is bad at idle
#5 Not sure if secondaries are opening (GrandsportC3)
#6 Hard to set curb idle
I'm open to suggestions!
#1 Looks great
#2 Slower than my Q-jet
#3 Car handles diffrent with less weight in front (not sure if I like it or not)
#4 Exhaust smell is bad at idle
#5 Not sure if secondaries are opening (GrandsportC3)
#6 Hard to set curb idle
I'm open to suggestions!
Melting Slicks
Joined: Apr 2002
Posts: 2,103
Likes: 0
From: Tucson AZ
Re: 1969 LT1 Clone (micks69)
Are you after the look of the LT-1 under the hood, or the actual feel of the LT-1 when driving?
For driving, you definitely want a dual plane intake.
Did you do a cam swap? What size exhaust? You could be dumping too much fuel without the ability to fully burn it or get the gases out.
There should be a noticeable difference in power (for the better) between an LT-1 and L46.
The exhaust smell is noticeable on mine.
The L46 is a more streetable driver.
[Modified by Robert N, 5:25 PM 10/7/2002]
For driving, you definitely want a dual plane intake.
Did you do a cam swap? What size exhaust? You could be dumping too much fuel without the ability to fully burn it or get the gases out.
There should be a noticeable difference in power (for the better) between an LT-1 and L46.
The exhaust smell is noticeable on mine.
The L46 is a more streetable driver.
[Modified by Robert N, 5:25 PM 10/7/2002]
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 1,160
Likes: 3
From: Greensboro NC
Re: 1969 LT1 Clone (Robert N)
Are you after the look of the LT-1 under the hood, or the actual feel of the LT-1 when driving?
For driving, you definitely want a dual plane intake.
Did you do a cam swap? What size exhaust? You could be dumping too much fuel without the ability to fully burn it or get the gases out.
There should be a noticeable difference in power (for the better) between an LT-1 and L46.
The exhaust smell is noticeable on mine.
The L46 is a more streetable driver.
[Modified by Robert N, 5:25 PM 10/7/2002]
For driving, you definitely want a dual plane intake.
Did you do a cam swap? What size exhaust? You could be dumping too much fuel without the ability to fully burn it or get the gases out.
There should be a noticeable difference in power (for the better) between an LT-1 and L46.
The exhaust smell is noticeable on mine.
The L46 is a more streetable driver.
[Modified by Robert N, 5:25 PM 10/7/2002]
I always wondered what the definition of "streetable" means? If it means drives good then thats what I want. That leaves everything else or not "streetable" what is that? Goes really fast but not reliably or often? I want something that looks cool, is reliable and goes faster than most other stock vettes.
Stock 2 1/2 inch side exhaust and LT1 cam.
Melting Slicks
Joined: Apr 2000
Posts: 3,286
Likes: 8
From: San Jose California
Re: 1969 LT1 Clone (micks69)
Superfast80,
Because I want a car that I can do more mods on without ruining the value.
I have found out that I much prefer working on and modding a car than going to cruise nights an ddriving them. And in my opinion a 69 ragtop w/side exhaust and manual brakes and steering isnt much fun to drive anywhere more than 1 1/2 hours. I much prefer my new 02 Z28 for those kind of trips.
Soooo what I'm saying is until I sell her I'm going to keep putzing around with it.
Because I want a car that I can do more mods on without ruining the value.
I have found out that I much prefer working on and modding a car than going to cruise nights an ddriving them. And in my opinion a 69 ragtop w/side exhaust and manual brakes and steering isnt much fun to drive anywhere more than 1 1/2 hours. I much prefer my new 02 Z28 for those kind of trips.
Soooo what I'm saying is until I sell her I'm going to keep putzing around with it.
Chuck
Racer
Joined: Feb 2001
Posts: 377
Likes: 0
Re: 1969 LT1 Clone (micks69)
What about hood clearance. The L-46 is o.k. But for the hassle of the 11.0 compression and 91 octane, I would like it much quicker.The expense of the 110 race gas that I mix in definanltly helps, but I've been trying to figure out what to do. I've been considering doing the the LT1 clone as well. Any opinions?
Melting Slicks
Joined: Apr 2002
Posts: 2,103
Likes: 0
From: Tucson AZ
Re: 1969 LT1 Clone (micks69)
I agree that the L46 is faster to 90 than the LT-1 in the article, but I have a tough time believing that from where I sit.
By "streetable". I mean easier to drive. The lope in the cam makes for a great idle and lot's of instant go, but driving in daily traffic and sitting at traffic lights is not so fun. Shifting is smoother between 3500 and 4000 rpms and that is difficult in traffic. The LT-1 (if I remember right) hit peak torque and power much later than the L46, so the power in the L46 is a more usable range.
I think Chuck is right about the tuning.
Other than that, the LT-1 intake was a dual plane and a single plane will make a drastic difference.
"Dual plane manifolds have shown to be more throttle and torque responsive at low and mid range rpm levels than most (but not all) single plane manifold designs." "[A single plane] has drawbacks, particularly as the number of cylinders increase. Intake pulses start to overlap, and that can mean that a cylinder will "rob" the cylinder following it in the firing order of charge- if they are located close to each other in the block."
By "streetable". I mean easier to drive. The lope in the cam makes for a great idle and lot's of instant go, but driving in daily traffic and sitting at traffic lights is not so fun. Shifting is smoother between 3500 and 4000 rpms and that is difficult in traffic. The LT-1 (if I remember right) hit peak torque and power much later than the L46, so the power in the L46 is a more usable range.
I think Chuck is right about the tuning.
Other than that, the LT-1 intake was a dual plane and a single plane will make a drastic difference.
"Dual plane manifolds have shown to be more throttle and torque responsive at low and mid range rpm levels than most (but not all) single plane manifold designs." "[A single plane] has drawbacks, particularly as the number of cylinders increase. Intake pulses start to overlap, and that can mean that a cylinder will "rob" the cylinder following it in the firing order of charge- if they are located close to each other in the block."
Melting Slicks
Joined: Apr 2000
Posts: 3,286
Likes: 8
From: San Jose California
Re: 1969 LT1 Clone (Jon69L46)
Jon,
The L46 and the LT1 are really only 10.5:1 cr. I never had any real problem with detonation if I used premium fuel. If I needed more octane, I have been very impressed with the "Supreme Lead 130". A quart per tank will raise 91 octane to 95-96 octane.
If you block the heat riser passage on the intake, you will significantly lower the octance requirement. An oil splash shield under the intake will also help. Ifpinging or detonation is a problem, I would suspect carbon buildup in the combustion chamber raising the effective compression ratio and glowing like little charcoal briquettes.
Chuck
The L46 and the LT1 are really only 10.5:1 cr. I never had any real problem with detonation if I used premium fuel. If I needed more octane, I have been very impressed with the "Supreme Lead 130". A quart per tank will raise 91 octane to 95-96 octane.
If you block the heat riser passage on the intake, you will significantly lower the octance requirement. An oil splash shield under the intake will also help. Ifpinging or detonation is a problem, I would suspect carbon buildup in the combustion chamber raising the effective compression ratio and glowing like little charcoal briquettes.
Chuck
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: 1969 LT1 Clone (micks69)
I'm open to suggestions!
:cheers:
Olivier
[Modified by GrandSportC3, 9:11 PM 10/7/2002]
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 1,160
Likes: 3
From: Greensboro NC
Re: 1969 LT1 Clone (GrandSportC3)
I'm open to suggestions!
80508 carb that you currently have (if it is a 80508).. This should solve your idle problem and add some power!!
:cheers:
Olivier
[Modified by GrandSportC3, 9:11 PM 10/7/2002]
80508 carb that you currently have (if it is a 80508).. This should solve your idle problem and add some power!!
:cheers:
Olivier
[Modified by GrandSportC3, 9:11 PM 10/7/2002]