intake and exhaust

[supersean1967]

headers question for a 292??? What do you do with the heatriser and intake manifold when placing headers on the 292. I really am broke and don't have the mulla to spend on an Offy intake..are there any mods or another intake i can get from another year Gm vehicle for the intake?

what type of headers

[supersean1967]

oh and can you guys throw up some pics of the setups you guys are using or have used of your intake & exhaust..

[geezer#99]

You can buy and install a heat plate from Langdon's. It works on the stock intake too.
Here's a pic of my 230 with Langdon's cast iron headers and offy intake.
First pic is stock intake and heat plate. Second is with Offy and Holley 350 2 bbl.

[supersean1967]

heat plate???? so can i just bolt a piece of flat stock steel under the intake?

[LandonL]

No, you can use this:
http://stoveboltengineco.com/index.p...roduct=1222036

What this does is replace what the exhaust heat was doing. Runs the hot water up through the chamber in the intake to heat up the fuel. The exhaust heat was doing this before. Helps get a smooth warm up so the fuel going through the intake isn't as cold. Does more complicated stuff, but I can't remember exactly.

But this will fix the problem your having.

[PanelDeland]

It's usually best to use the water heated set-up on the intake.You might get by with out if you live in a year round warm climate but you could still have driveability issues.The 6 cyl intake has such long runners that the fuel tends to condense and puddle in the intake.

[292farmer]

heres my set up, no heated intake, i think my trucks a freak though runs better when temp is below 60* but i have 5.13s so maybe that has something to do with it. im always revving the shizz nat out of that 292

[supersean1967]

why does the intake need to be heated ?

forgive me i am new to this but why do you run water through the intake

292farmer what mfr headers are you using?

['68OrangeSunshine]

Originally Posted by supersean1967

why does the intake need to be heated ?

If you live below the 33rd Parallel, you may not need carb heat. I live in Tucson AZ, and never had it on my 292. Runs great.

[LandonL]

For the following reasons:
(I quoted these from http://yarchive.net/car/heated_intake.html)

"This heat is distinctly different
from the air intake heat which can be eliminated. The heated manifold
offsets the cooling effect of gasoline and it promotes the
vaporization of gas that would otherwise adhere to the manifold walls
and flow to the cylinders as liquid."

And you don't run water through the intake, theres a small chamber under the intake that circulates heat under where the gas flows. That small chamber doesn't actually mix the water with the gas if thats what you meant.
Horribly worded sorry.

[292farmer]

basically it keeps the fuel from puddling on the bottom of the intake, with out heat they tend to bog off idle and sputter.mine does bog slightly but my gearings so low i really don't notice.
my headers are clifford shorty headers, i'd perfer long tube headers, but didnt have the dough so bought these used.
i'll also be converting to dual carbs this winter, ill be making my intake heated then. hoping i'll notice a big difference.
oh yeah i painted them that color they came plain.