what is this port for (V8 Vortec heads)
- Thread starter nordwind
- Start date
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maybe egr?
I'll be honest with you, that doesn't look like any vortec manifold I've seen. There might be vortec heads on there, but isn't that a carb base in the photo?
It is for an EGR valve.
So what manifold is that?
- Thread starter
- #6
I bought the engine, manifold installed (12499101 - GM Performance HT383)
there are more pictures https://forum.ih8mud.com/40-55-series-tech/363982-donkey-build-up.html
,what is a EGR ?
there are more pictures https://forum.ih8mud.com/40-55-series-tech/363982-donkey-build-up.html
,what is a EGR ?
gwalt584
SILVER Star
Exhaust gas recirculation
That should be for coolant to flow to the intake plate near the TB or whatever injection you are running. Part of a functioning EGR (exhaust gas recirculation). Lots of people delete them purely to reduce intake manifold temperatures.
I may be way off, because i have never seen that intake before with that passage.
I may be way off, because i have never seen that intake before with that passage.
It is the EGR port. Type 3 manifold. Type 1 has no ports, type 2 has EGR port and mechanical choke port. It should use a L82 EGR. It is the same port you see on a ZZ4 engine.
- Thread starter
- #10
What do I do with it?
powder-coated the lid and close it?
,use the port for something else?
Could I use the port for the "external coolant bypass"
,I've read
GENERAL MOTORS
SERVICE PARTS OPERATIONS
Any small block engine, regardless of year, that uses Vortec heads, will require an external coolant bypass line from the intake manifold to the 5/8" hose nipple on the water pump (passenger’s side)
powder-coated the lid and close it?
,use the port for something else?
Could I use the port for the "external coolant bypass"
,I've read
GENERAL MOTORS
SERVICE PARTS OPERATIONS
Any small block engine, regardless of year, that uses Vortec heads, will require an external coolant bypass line from the intake manifold to the 5/8" hose nipple on the water pump (passenger’s side)
Close it back up or go and buy a C.A.R.B. legal carburetor and a EGR and a thermal switch and a thermostat housing that has a hole for the thermal switch and hook it up.
