1971 LS6 Questions

[James W.]

Did LS6 equipped cars come from the factory with a heat riser valve between the right side exhaust manifold and the exhaust head pipe?

I believe the Technical Information and Judging Manual says that they did but I've been told that they did not have one.

What is correct?

The reason why I am asking this question is because there will be an LS6 equipped car at our chapter judging meet and I am trying to learn all that I can about them before we have to judge the car.

Anyone with first hand knowledge about these cars interested in coming to Nebraska in late May to help us judge this car?


Best Regards,

James West

[Terry M.]

Re: 1971 LS6 Questions

Jim,
I have seen quite a few LS6s including one with 3300 miles, and one with 500 miles (a quarter mile at a time). ALL of them had heat riser valves.

Save me the trouble of looking it up. What is the date of your Chapter meet?

[James W.]

Re: 1971 LS6 Questions

Terry,


Thank you for your reply. Our chapter judging meet is Saturday, May 30th in Lincoln, Nebraska.


Best Regards,

James West

[Terry M.]

Re: 1971 LS6 Questions

Is that Memorial Day weekend? I will do some checking and see if I can get some traveling partner(s).

BTW: I cheated and looked at the on-line calendar and it is not listed. Your Chapter might want to consider listing the event.

[James W.]

Re: 1971 LS6 Questions

Terry,

No it is the weekend after the Memorial Day Holiday. We would greatly appreciate any help in judging this car. Our overall judging knowledge outside the C2 cars is limited.

I will see about getting the out chapter meet on the on-line calendar.


Thanks again,

James West

[Duke W.]

Re: 1971 LS6 Questions

Only fuel injection engines of that era did not have heat riser valves. I'm pretty sure than even the L-88 and ZL-1 rolled out of St. Louis with heat riser valves.

In addition to aiding warmup, they were also necessary to meet exhaust emission standards.

Duke

[Joe L.]

Re: 1971 LS6 Questions

Only fuel injection engines of that era did not have heat riser valves. I'm pretty sure than even the L-88 and ZL-1 rolled out of St. Louis with heat riser valves.

In addition to aiding warmup, they were also necessary to meet exhaust emission standards.

Duke

Duke----


1967-69 L-88 and ZL-1 were not equipped with a heat riser valve. They used the same spacer as earlier FI applications.

[Joe L.]

Re: 1971 LS6 Questions

Did LS6 equipped cars come from the factory with a heat riser valve between the right side exhaust manifold and the exhaust head pipe?

I believe the Technical Information and Judging Manual says that they did but I've been told that they did not have one.

What is correct?

The reason why I am asking this question is because there will be an LS6 equipped car at our chapter judging meet and I am trying to learn all that I can about them before we have to judge the car.

Anyone with first hand knowledge about these cars interested in coming to Nebraska in late May to help us judge this car?


Best Regards,

James West

James-----


I agree with the others. 1971 LS-6 applications were equipped with a heat riser valve.

[Jack H.]

Re: 1971 LS6 Questions

I thought that chapter meets automatically went on the calendar when ads were submitted to Driveline... I know it's not mandatory for chapter meets to be advertized in Driveline, but memory tells me when you do advertize the meet, that's the trigger for NCRS to provide meet insurance...

[John H.]

Re: 1971 LS6 Questions

Here's my neighbor's original/unrestored '71 LS-6/THM400; note the heat riser valve. He's the second owner - that's the original starter - original owner's starter rebuilder painted it white . Runs 12.10's @ 115 in the Pure Stock Drags, and it's as stock and original as they come.

[Tom M.]

Re: 1971 LS6 Questions

Only fuel injection engines of that era did not have heat riser valves. I'm pretty sure than even the L-88 and ZL-1 rolled out of St. Louis with heat riser valves.

In addition to aiding warmup, they were also necessary to meet exhaust emission standards.

Duke

Duke, not on L88'S

Tom

[Tom M.]

Re: 1971 LS6 Questions

James-----


I agree with the others. 1971 LS-6 applications were equipped with a heat riser valve.

I have owned both a ZR2 AND LS6 Corvette , I'm 99.9 % positive that they had the heat riser
Regards Tom

[Steven B.]

Re: 1971 LS6 Questions

Here's my neighbor's original/unrestored '71 LS-6/THM400; note the heat riser valve. He's the second owner - that's the original starter - original owner's starter rebuilder painted it white . Runs 12.10's @ 115 in the Pure Stock Drags, and it's as stock and original as they come.

Alot of great original finish on the chassis, etc.

[Tom M.]

Re: 1971 LS6 Questions

[quote=John Hinckley (29964);407258]Here's my neighbor's original/unrestored '71 LS-6/THM400; note the heat riser valve. He's the second owner - that's the original starter - original owner's starter rebuilder painted it white . Runs 12.10's @ 115 in the Pure Stock Drags, and it's as stock and original as they come. [/ , Is it for sale ?
Tom

[Warren F.]

Re: 1971 LS6 Questions

James,

I am pretty knowledgeable about these special cars, unfortunately I have no judging experience. I can tell you, there are several unique features in the engine bay that the TIM & JG does not address as they pertain only to a '71 LS6 Corvette. I have kept these differences pretty close to the heart, as I do not wish to have the LS6 Corvettes fall into the same problems that the L-88 crowd had to deal with. The recreating of these cars.

I would be interested to know if this car is included in the NCRS LS6 survey/registry.
Warren

The reason why I am asking this question is because there will be an LS6 equipped car at our chapter judging meet and I am trying to learn all that I can about them before we have to judge the car.

Anyone with first hand knowledge about these cars interested in coming to Nebraska in late May to help us judge this car?


Best Regards,

James West