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1971 Exhaust Manifold swap

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RobinPDX View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RobinPDX Quote  Post ReplyReply Direct Link To This Post Posted: Jan/04/2022 at 3:31pm
I do not plan on any rough terrain driving, Maybe a little but not much.
The thing was meant to be my HomeDepot currier rig, yet it's a guy thing and of Course I cannot seem to leave it well enough alone..
Now if only I can reel in my imagination about "what next" can I do to it...Guy stuff ...
Rob Wiley
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mramc Quote  Post ReplyReply Direct Link To This Post Posted: Jan/05/2022 at 12:38pm
Do these flow similarly to a header? They sure look like it.

Yes, They are some times referred to as cast iron free flow headers. LRDaum
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sonic Silver Quote  Post ReplyReply Direct Link To This Post Posted: Jan/06/2022 at 11:14am
On my modified 360, the free flow exhaust manifolds were down 21 horsepower and 32 ft/lbs torque to a set of 1-3/4 inch headers on an engine dyno. On a stock engine, I would think the difference would be less.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RobinPDX Quote  Post ReplyReply Direct Link To This Post Posted: Jan/06/2022 at 11:17am
I considered he possibilities  of headers or the better OEM cast Iron pieces. 
It's almost a default headers win all around in performance.
So, If I cannot locate the Early OEM cast iron ones with Air injectors holes, I will likely go headers. 
Rob Wiley
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Sonic Silver Quote  Post ReplyReply Direct Link To This Post Posted: Jan/06/2022 at 11:37am
Originally posted by RobinPDX RobinPDX wrote:

I considered he possibilities  of headers or the better OEM cast Iron pieces. 
It's almost a default headers win all around in performance.
So, If I cannot locate the Early OEM cast iron ones with Air injectors holes, I will likely go headers. 
I stuck with the free flows. I would rather be down in horsepower than to put up with headers, but to each his own.
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70,71,72 AMXS View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 70,71,72 AMXS Quote  Post ReplyReply Direct Link To This Post Posted: Jan/07/2022 at 6:19am
I ran headers on my J10 for many years with no issues. Made sure they actually lined up fairly well with the mounting surfaces and used the copper infused RTV on both sides of the gaskets. Retorqued them several times during the first month, and didn't touch them again.
  Now my FSJ Cherokee with a 401 and used for plowing snow, was a different story. couldn't keep gaskets in that, had to go back to free flows..
Bruce in NW Ohio
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mramc Quote  Post ReplyReply Direct Link To This Post Posted: Jan/07/2022 at 5:09pm
You buy new AMC V-8 cast iron free flow manifold from Omix-ADA BUT , and it is a big BUT they are probably more costly then headers. On the other hand you can change a starter with removing a header with the cast iron manifolds. The Jeep vendors sell Omix-ADA parts (Taiwan Made) and prices may vary. LRDaum
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