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" For Sale" Imco Powerflow Exhaust for GM big block

Daryl said:
These manafolds are like new only on boat 5 hours. Just manafolds no risers. asking $800.00.

Call Daryl ant 410-822-9547 or email margaret425@hotmail.com
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Here you go boys this is a good deal on some real manifolds instead of the ematation ones that have been floating around. These make hp on the dyno and off shore champions use them. They create volocity and good dyno #'s Yes I am a Imco dealer but these aren't mine. I have new ones for sale at a good price but not this cheap.
Darl you need to post some pics of your mani's
 
I ran Imco's on mine and loved them never had any trouble. NO leaks and never needed gaskets good stuff:thumb: and thats a cheap price I think the complete set up on mine was around 26-2700.00
 
lets see some pics of these manifolds, and mk whats the price on the risers, have a friend that might be interested if price is right. thanks haope to hear from you.
 
throttletherapy said:
lets see some pics of these manifolds, and mk whats the price on the risers, have a friend that might be interested if price is right. thanks haope to hear from you.
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Depends on which riser that will be needed. If tips are in stock location around $900 for the A riser set

Other accessories that may be needed is:
shift relocation bracket,
ECM bracket
Oil filter relocation bracket

Let me know exactly what is needed and I will pm you a good price.
 
I have a couple of pictures on Craigslist but i wasnt able to figure out how to get pics on checkmate forum if you want to leave your email address I will email pics to your email.
 
what makes these different from the emi's, just curious.

i noticed that most all of these manifold exhaust systems look so similar!
 
I might be wrong but I thought on a closed cooling system fresh water ran threw the exhaust regardless. No antifreeze is ever in the exhaust the water thats brought in,, to cool the closed unit exits threw the exhaust.

What I am saying is on a closed cooling system the only thing thats closed is the engine not the exhaust.

Sombody correct me if I am wrong
 
Big Red said:
I might be wrong but I thought on a closed cooling system fresh water ran threw the exhaust regardless. No antifreeze is ever in the exhaust the water thats brought in,, to cool the closed unit exits threw the exhaust.

What I am saying is on a closed cooling system the only thing thats closed is the engine not the exhaust.

Sombody correct me if I am wrong
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They do sell cooling systems that just cool the block. They also make complete systems that cool the exhaust manifolds or in this case, headers as well. Raw water is brought in through the intake, it cools the coolant in the heat exchanger, and is then emptied into the riser where it exits with the exhaust. You would still have raw water going through your riser, but at least its not going through your header as well. The recirc header allows you to "recirculate" coolant through the header and keep it separate from the riser so it stays a closed system.

There's a schematic at the bottm of this page,
http://www.cpperformance.com/detail.aspx?ID=11139

Here's a link for the recirc headers from IMCO,
http://imcomarine.com/ca_store/index.php?main_page=product_info&cPath=16_57_76&products_id=794

They claim to get added performance from the closed cooling system because coolant is more efficient at keeping constant operating temperatures. Plus if you run in salt water like I do, those headers will last alot longer with coolant running through them instead of salt water.:thumb:
 
interesting.....

i wonder what they do different to the manifolds. by part number they are different. but by looks they are the same, and just knowing what a manifold like this looks like, Im not sure why you couldnt run a regular one plumbed like the example in your first link.
rather than the water going up into the riser, its blocked off at the gasket between riser and manifold, coolant is then sent back to heatexchanger and water is sent through the riser as in you example......????? :confused:

there may be some type of flow restriction on the standard setup??
wouldnt think so.
 
although the photo of the standard unit doesnt show a bung for water passage out of the manifold. my EMIs have it though
 
boatn70 said:
although the photo of the standard unit doesnt show a bung for water passage out of the manifold. my EMIs have it though
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Thats exactly the difference. I've never seen or inspected them upclose but you're right that little bung or fitting is the big difference. Also if you look closly at the top of the manifold. The recirc type doesn't have open cooling passages that would lead into the riser. So no need for a gasket to block it off, you can just use a regular gasket.

I have seen pictures of the EMIs that thave that fitting. I know the regular IMCO ones don't.
 
I just looked at the imco Dstyles75 listed if you look close where the riser bolts on their are no water holes. Look at the gasket shown then look at the top where the riser bolts on.
 
It is recommended the standard Imco manifolds be used with a closed cooling system, The engine coolant is isolated from the exhaust manifolds,
The recirc manifolds can be plumb different ways and the are used to preheat the water before cooling the exchanger coolant or they can be tied into the exchanger coolant that recircs through the block, This is only done when the water temp. is extremely cold all the time, like Canada or Alaska lakes.
In any application with Imco the risers are cooled with sea water
If plumbed in this way on most lakes in the states the cold water can't keep up to cool the engine properly.
So if you have a closed cooling system and boat west,mid or east cost in the summer. you should run the standard manifolds.


MK
 
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