70 thru 72 LT-1 Carb. insulator ?
Thread Starter
Drifting
Joined: Oct 2007
Posts: 1,254
Likes: 5
From: Brown Summit North Carolina
70 thru 72 LT-1 Carb. insulator ?
I recently read a long post from the past that addressed heat sheilds under carburtors, and how base cars had 1 part # and Holley equipped cars used another #.
One member stated that the heat sheild's were a dealer installed solution on an as needed basis for hard start conditions.
I have a restoration manual , that also states that all 70 thru 72 LT-1's used a insulator between the intake and carb. To me a insulator is not the heat sheild, An insolator sounds like a thick spacer of special material to prevent heat transfer. The sheild simply blocks heat radiation.
Can someone addres this, is there a seperate insulator that is about 1/4" thick that goes between the carb and intake that is not the thin metal sheild that proturdes well beyond the base of the carb.?
Thanks David
One member stated that the heat sheild's were a dealer installed solution on an as needed basis for hard start conditions.
I have a restoration manual , that also states that all 70 thru 72 LT-1's used a insulator between the intake and carb. To me a insulator is not the heat sheild, An insolator sounds like a thick spacer of special material to prevent heat transfer. The sheild simply blocks heat radiation.
Can someone addres this, is there a seperate insulator that is about 1/4" thick that goes between the carb and intake that is not the thin metal sheild that proturdes well beyond the base of the carb.?
Thanks David
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
without thermal isolation / Heat shield,
the carb will get nearly as hot as the rest of the motor.
Installing a Carb Isolator will drop the carb temp. nearly 100 degres.
without a Isolator and the motor at running temp.
you cannot hold your hand on the carb.
With an isolator, the carb will feel like an Ice chest.
you want the thick carb gasket to give you that thermal Isolation.
Huge differance !
the carb will get nearly as hot as the rest of the motor.
Installing a Carb Isolator will drop the carb temp. nearly 100 degres.
without a Isolator and the motor at running temp.
you cannot hold your hand on the carb.
With an isolator, the carb will feel like an Ice chest.
you want the thick carb gasket to give you that thermal Isolation.
Huge differance !
Drifting
Joined: Jun 2003
Posts: 1,455
Likes: 5
From: Upstate South Carolina
There is a difference between heat shields and insulators. Heat Shields made of aluminum were only installed on 1970 cars with CA emissions. All 70-72 cars had insulators that varied in thickness based on year and carb installed.
Burning Brakes
Joined: Jan 2006
Posts: 1,152
Likes: 23
From: Kawartha Lakes and PEC, Ontario
without thermal isolation / Heat shield,
the carb will get nearly as hot as the rest of the motor.
Installing a Carb Isolator will drop the carb temp. nearly 100 degres.
without a Isolator and the motor at running temp.
you cannot hold your hand on the carb.
With an isolator, the carb will feel like an Ice chest.
you want the thick carb gasket to give you that thermal Isolation.
Huge differance !
the carb will get nearly as hot as the rest of the motor.
Installing a Carb Isolator will drop the carb temp. nearly 100 degres.
without a Isolator and the motor at running temp.
you cannot hold your hand on the carb.
With an isolator, the carb will feel like an Ice chest.
you want the thick carb gasket to give you that thermal Isolation.
Huge differance !
I got some incorrect advice about this a few years back and I removed it. Once the engine was hot it would stall at idle, I assume because the carb was too hot.
