Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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88v8
Ivor Duarte
Gloucestershire UK
(577 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

LT1 engine + carb?
Posted by: 88v8
Date: May 28, 2018 10:43AM

Looking at a British car with a 96/97 LT1.

Being a Luddite, I'm alarmed by the complexifications of injection and ignition system. Is it possible to put a 4-barrel on this engine?

Ivor


Jim Stabe
Jim Stabe
San Diego, Ca
(647 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

authors avatar
Re: LT1 engine + carb?
Posted by: Jim Stabe
Date: May 28, 2018 12:04PM

The engine is designed to run with the injection and ignition run by the computer and I would advise that you retain it if the car is currently running that way. That said, I believe a SBC Chevy intake will bolt in place and a standard distributor will then fit in the engine if you desire to return to the dark ages. You will have to remove the Optispark but I don't believe that will upset any of the drives on the front of the engine


88v8
Ivor Duarte
Gloucestershire UK
(577 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: LT1 engine + carb?
Posted by: 88v8
Date: May 28, 2018 05:49PM

Haha, thankyou, I like the dark ages.
Our house is 400 years old.

It bothers me when I see people on this and other forums struggling to diagnose problems with electronics.
And garages over here would be no help. Most probably never see an American car.

OK, If I buy it you'll be the first to know.

Ivor


minorv8
Jukka Harkola

(125 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: LT1 engine + carb?
Posted by: minorv8
Date: May 30, 2018 06:22AM

I doubt that conventional distributor can be fitted. I donīt remember if LT1 even has a provision for rear mounted distributor.

Hereīs one Youtube clip to sort the dizzy thing:

[www.youtube.com]

As for manifolds, you need a LT1 specific intake if you want to run a carb:

[www.flowtechinduction.com]
[www.jegs.com]


Jim Stabe
Jim Stabe
San Diego, Ca
(647 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

authors avatar
Re: LT1 engine + carb?
Posted by: Jim Stabe
Date: May 30, 2018 09:31AM

Lt1 has a drive for the oil pump, it just doesn't have a hole in the manifold. The SBC manifold will have the distributor hole.


MGBV8
Carl Floyd
Kingsport, TN
(3374 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: LT1 engine + carb?
Posted by: MGBV8
Date: May 30, 2018 11:42AM

You need to use a carb intake manifold that is specific to the LT1. Like this one:

[www.summitracing.com]

Do more homework before you dive in.

Quote:
My LT-1 came out of a 1994 Roadmaster Buick. I chose this intake because of the bolt pattern. the intake bolts for the head are at an angle and the bolts are further apart than a 350. when you take the Omni-Spark distributor off, you can get cover plate to cover the end of the cam which bolts on to the timing chain cover from Summit Racing. When you pull the throttle body intake off look in the back of the block where the distributor goes, and you will find a bolt when you take the bolt out there is a plug to take out so you can install you distributor. I understand any 350 distributor will work. This way you can still use the stock electric water pump.



Jim Stabe
Jim Stabe
San Diego, Ca
(647 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

authors avatar
Re: LT1 engine + carb?
Posted by: Jim Stabe
Date: May 30, 2018 04:04PM

My bad! I didn't realize Chevy changed the bolt pattern on the LT1 manifold. I still think he should leave the injection on if the car is running well.



88v8
Ivor Duarte
Gloucestershire UK
(577 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: LT1 engine + carb?
Posted by: 88v8
Date: May 31, 2018 04:24AM

No, the fault was mine. I should have done more research.
That Summit manifold would be a cheap solution. Plus the carb of course. Plus an insulator. And filter. And the dizzie. And the blanking plate at $80. And dyno time to set up the carb. And a throttle cable. And a choke cable.
Hmmm. Perhaps the injection could stay there fttb.

Ivor


Jim Stabe
Jim Stabe
San Diego, Ca
(647 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

authors avatar
Re: LT1 engine + carb?
Posted by: Jim Stabe
Date: May 31, 2018 10:22AM

I like mine and it's very tunable.

Engine.jpg


GTplus
Tracy Moore
Jacksonville, Fl
(5 posts)

Registered:
05/22/2011 05:37PM

Main British Car:
'71 MGB GT, '77 MGB chrevrolet 350, LT1 350 in the MGB

Re: LT1 engine + carb?
Posted by: GTplus
Date: June 01, 2018 04:08PM

Ivor,
I put a GM performance 4 barrel intake on my LT1. Pull the plug in the back of the motor, and drop in what ever distributor you want. You'll need a dizzy that has the proper gear on it for use with the factory hydraulic roller cam of course. I bought an MSD and dropped it in the hole. I would imagine that intake is still available from Summit racing.


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