1981 Camaro Z28

[Darren]

Kyle, I have some hooker mid length headers... I'd let go cheap if you want them..

or Joel...

[JoeliusZ28]

This thing? My truck has it too

[JoeliusZ28]

Well the de-stroked LS3, for example, uses the 4.8 crank - and then revs past 8k, which would make for something pretty unique.

While i love the idea of that mouse motor, this lead sled might not be the car to use it in, youre gonna need low end torque to get it moving.

[MP81]

While i love the idea of that mouse motor, this lead sled might not be the car to use it in, youre gonna need low end torque to get it moving.

That's a good point.

That might be mitigated by destroking an LS7 instead.

[MP81]

This thing? My truck has it too

I can't tell what that is (doesn't help I have to look at it on my phone, versus the computer).

[bri2203]

This thing? My truck has it too

That is a heat riser

[MP81]

Is that what that goofy metal tube (that goes from the exhaust manifold to the air cleaner) on the right side of the car is? Always wondered what that was.

[JoeliusZ28]

Heat riser? I thought it was an exhaust based choke mechanism for warmup. It does have a heat riser as well though.

[MP81]

Heat riser? I thought it was an exhaust based choke mechanism for warmup. It does have a heat riser as well though.

This forum post seems to outline the chokes on the Q-Jet (I can't recall what year yours is, so I just posted it all here):

There are two styles of Q-Jets, and the setup procedure differs between the two.

The early style carbs utilize a “divorced choke” system. These carbs, used from 1967–1974, rely on a choke coil bolted down to the intake manifold inside a little metal box. There is a rod that connects the carb choke linkage to the coil on the manifold. As the manifold crossover gets hot, the coil expands, and pushes the rod up to open the choke.

The second style uses an “integral choke,” and was used from 1975–1981 (except truck – Heavy Duty truck carbs used after 1975 still used divorced choke systems). 1975–1979 uses a “hot air” choke whereby clean air is pulled from a nipple at the back of the carb airhorn, through a steel tube, through a heat exchanger in the manifold crossover, and back up a steel tube into the front of the choke housing on the carb. There is a vacuum bleed hole between the carb choke housing and manifold vacuum, causing the air to be pulled through the tube from the airhorn. As the engine gets hot, the air in the tube gets hot, and the coil expands to open the choke. This choke will not function at all if the entire hot air tube system is not hooked up and functional. From 1980-1981 an integral electric choke was used in place of the hot air system. There is a single wire that connects to the choke housing cover. The cover contains an electrical heating element that heats up the coil and opens the choke.

[JoeliusZ28]

This isnt the choke on the q-jet, youre looking at a pic of the bottom of my passenger exhaust manifold. Its a device intended to create a temporarrly exhaust restriction.

[MP81]

I was in a meeting so I didn't read your post closely enough - I read it as a carb choke, using exhaust - not a physical choke in the exhaust.

[JoeliusZ28]

No worries, im not surprised your mind instinctively doubted the possibly that some engineers thought something like this was a good idea. Should have seen the look on my face when i removed the exhaust and found that...

[TSTONE]

Jonezing to see your pics but they're all broken for me?

[MP81]

No worries, im not surprised your mind instinctively doubted the possibly that some engineers thought something like this was a good idea. Should have seen the look on my face when i removed the exhaust and found that...

These were dark times.

[MP81]

Jonezing to see your pics but they're all broken for me?

Really? That's odd...showing up here. Do they work now - maybe there was a glitch on FB (which is where they're hosted - account not needed, as far as I know) when you were looking?