4-2-1 Exhaust Manifold

[geno58]

I have a 1980 Carburated Fiat Spider, I want to use an early 4-2-1 exhaust manifold, but it doesn't have the water outlet on it. I am not using the water heated Carb any longer, is it possible to block off the water outlet and use the early manifold?

[So Cal Mark]

there isn't any water outlet on the exhaust manifold

[Fiat88]

there isn't any water outlet on the exhaust manifold

Maybe he's talking about the egr pipe.

[geno58]

I thought I noticed an extra ear and bolt hole on the back of the Stock Manifold, I still have the heat sheild on the stock manifold as well as the rest of the stock stuff. I guess I was wrong.

[lanciahf]

Could be the water pump/heater pipe running under the exhaust manifold. That pipe has an "ear" nipple for the water choke.

[FiatMac]

I agree with Fiat88, he is probably talking about the EGR port at the front of the carburated 2 liter manifold and head. This would be the "extra ear and bolt" he is describing.

[geno58]

Yep, I think it is the EGR pipe at the front of the motor, at any rate the early manifold doesn't have that mount.
I have noticed headers that just have part of the header flange cover that hole.
So my question is, could I make an Aluminum adapter plate that would match a 2L exhaust gasket, less the hole for the pipe, and just through bolt the manifold through the adapter, effectivly blocking the EGR passage.
Or am I just spinning my wheels, so to speak

[So Cal Mark]

since you won't be using the EGR, just block that hole off. If you're changing the intake manifold to an earlier version it won't be an issue at all

[geno58]

Thanks, thats what I needed to know

[geno58]

One last question, what down pipes should I use to fit the 1980 chassis, I will be eliminating the Cat.

[narfire]

Depends on the manifold. Early manifolds have 4 studs for the down pipe the later,my 80 fi anyway, have 6 studs. There is a flange at the end of the downpipe where the cat is connected. You will have to source or make a short pipe to replace the cat to the rest of the exhaust.
Chris

[Sunracer]

Try to find a 2 liter FI downpipe and manifold. they are bigger than the early ones and have no extra fittins to block on the manifold, other than the O2 sensor. PB : )