Heat from Headers

[old51sedan]

Have a 69 with 292/200-4R, just got it put together and running, but have decided to install a set of Langstons cast iron headers. Currently has the original carb & intake, may switch to a Clifford intake and 2 or 4 barrel. My question is heat on the carb to keep it warm. I know the Clifford has water channels to warm the carb, but I would like to do it with exhaust. I have a 51 sedan, 235/ with Fenton headers and the Fentons have are drilled and threaded from the factory and I just built a plate under the intake and plummet it with copper tubing, works great. Has anyone ever thought of drilling and tapping a set of Langston headers for exhaust heat? I will try and include a couple of pictures of the 51 with Fentons.

[68Gold/white]

Can't answer your question, BUT would go with a 2 Bbl intake, when ever you make that switch. Even a 292 is too small on the cubes for a 4 bbl. The 4 bbl can be made to work, BUT can some times be difficult...

[old51sedan]

Originally Posted by 68Gold/white

Can't answer your question, BUT would go with a 2 Bbl intake, when ever you make that switch. Even a 292 is too small on the cubes for a 4 bbl. The 4 bbl can be made to work, BUT can some times be difficult...

Well, I inclined to agree with you. I believe all of those aluminum intakes are 4 barrel then you need to install an adapter down to a 2 barrel. I was thinking of maybe an adapter from the original 1 barrel intake to a 2 barrel and going that route. Has anyone ever done that? I guess my question also is has anyone done this type of switch and not added heat and if so did it run alright? Thanks for the reply.

[truckster]

I bought a 79 Camaro with a 250. The previous owner had installed a Clifford 4-barrel intake and an Edelbrock 1406. That was way more carb than it could ever use.

Assuming a .80 volumetric efficiency (which is generous considering the design of the stock heads), a 292 would have to turn approximately 8,900 RPM to pull 600 CFM, which is on the small end for a 4-barrel carburetor.

['68OrangeSunshine]

I have a 292 bored .030-over [=296 CI]. It has oversize Intake Valves [1.84'' (1.6'' stock) ], a Crane 260H cam. Offy 5416 4V intake and Clifford headers. Carb is an Edelbrock 1404 500 CFM. It does just fine.
I use a 1405 [Carter 9635 actually] 600 CFM on the 350 V8 in my '71 Jimmy.

Donn-- Tom Langdon made cast iron headers for the 'Late Chevy L6s' [230, 250, 292] just like the Fentons. A couple years ago, he retired and sold the business to Tom Lowe, who still markets them. www.12Bolt.com

[old51sedan]

Originally Posted by '68OrangeSunshine

I have a 292 bored .030-over [=296 CI]. It has oversize Intake Valves [1.84'' (1.6'' stock) ], a Crane 260H cam. Offy 5416 4V intake and Clifford headers. Carb is an Edelbrock 1404 500 CFM. It does just fine.
I use a 1405 [Carter 9635 actually] 600 CFM on the 350 V8 in my '71 Jimmy.

Donn-- Tom Langdon made cast iron headers for the 'Late Chevy L6s' [230, 250, 292] just like the Fentons. A couple years ago, he retired and sold the business to Tom Lowe, who still markets them. www.12Bolt.com

Brian,
I guess I will have to call Tom @ 12bolt, I have been on his site but no sign of any Fenton headers. I was under the impression that Fenton didn't make headers for the 250/292 but I've been wrong before. Appreciate the input. Donn

['68OrangeSunshine]

Originally Posted by old51sedan

Brian,
I guess I will have to call Tom @ 12bolt, I have been on his site but no sign of any Fenton headers. I was under the impression that Fenton didn't make headers for the 250/292 but I've been wrong before. Appreciate the input. Donn

Fenton brand headers fit the 235/261 L6s. Tom LANGDON produced a very similar cast iron header for the 230/250/292 L6s, called the Langdon Headers.
Right, there are no 292 Fenton headers, because they're called Langdons.

[old51sedan]

Originally Posted by '68OrangeSunshine

Fenton brand headers fit the 235/261 L6s. Tom LANGDON produced a very similar cast iron header for the 230/250/292 L6s, called the Langdon Headers.
Right, there are no 292 Fenton headers, because they're called Langdons.

Well, that settles that. I like the fact that the Fenton's were set up for heat with a boss that is drilled and tapped. I have the Langston's, I'm wondering if these's enough metal there to drill and tap them for heat. It is so much easier with exhaust heat then it is to have to run plumbing around the engine and I believe that it looks better. As you can see in the pictures the ones on my 235 are tucked down in and out of the way.

['68OrangeSunshine]

I'm in Southern AZ. I've never needed carb heat. My Clifford Reasearch headers are tubular so a heat pipe would be problematic.
I only experienced carb icing once -- while driving back from a ski resort at night in a driving blizzard in the White Mountains. It was my linkages [a Rube Goldberg set-up with multiple bellcranks] that caught sleet [rime icing] and jammed up at hi-mid-throttle.
Had to balance thrust by slipping clutch in and out to regulate speed. I came into a McDonald's in Globe and shut it down. Had a cheeseburger and coffee, and opened the hood. The half hour I stopped was enough for the jammed linkages to thaw out and break up.
Since changing to a cable throttle, I've had no issues.