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Exhaust Manifold-Question Big Block #484152
09/30/09 02:13 PM
09/30/09 02:13 PM
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SW Fla.
CYACOP Offline OP
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I currently have a set of logs on my 383. Im going to a 440 and was thinking about changing to factory HiPo manifolds. Are the outlets in the same location?
Will my current exhaust pipes bolt right up with a little persuasion?

Re: Exhaust Manifold-Question Big Block [Re: CYACOP] #484153
09/30/09 02:38 PM
09/30/09 02:38 PM
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lewiston, ID
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cornucopia Offline
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nope...different pipes with the magnum manifolds.

Re: Exhaust Manifold-Question Big Block [Re: cornucopia] #484154
09/30/09 03:14 PM
09/30/09 03:14 PM
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Lincoln Nebraska
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RapidRobert Offline
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The logs have a 2" outlet and the HP's are 2&1/2" & work even better w 3" mandrel exhaust pipes right up to the 2&1/2" flange. As said different location and the 2" ones would be extremely restrictive on a 440.


live every 24 hour block of time like it's your last day on earth
Re: Exhaust Manifold-Question Big Block [Re: CYACOP] #484155
09/30/09 03:16 PM
09/30/09 03:16 PM
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Indiana
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Fury Fan Offline
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Yep, lots of differences are there.

The 'clocking' of the outlet flanges varies based on the year of the manifold (meaning, the rotation of the bolt hole pattern), plus on the driverside teh angle of the flange WRT the ground changes a lot (especially on C-body manifolds.

HP manifolds are generally 2 1/2" outlets IIRC and most logs are 2" or 2 1/8", so smaller pipes choke the flow.

Year One used to have some good info on teh flanges in their catalog, might be on their website somewhere.

Don't forget, you need all the sleeve nuts for the HP manifolds also!


Parts I seek: driver doorpanel, 65 Sport Fury, prefer black, needs to be 7-8 on 10 scale, might buy set 16" x 6" Dodge truck wheel(s), from early 70s?, takes 9" dogdish - need for a research job so cheaper is better. 69-73 C-body caliper brackets and/or splashields Send a PM.
Re: Exhaust Manifold-Question Big Block [Re: Fury Fan] #484156
09/30/09 03:29 PM
09/30/09 03:29 PM
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SW Fla.
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Thanks for the replies, that pretty much answered my question. I'll just have to stick with what I have for now.
Thanks again.

Re: Exhaust Manifold-Question Big Block [Re: CYACOP] #484157
09/30/09 05:53 PM
09/30/09 05:53 PM
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LimeliteAero Offline
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why are you swapping the 383 for the 440?

I dont understand the conversion but sticking with the choked down exhaust system?

Re: Exhaust Manifold-Question Big Block [Re: CYACOP] #484158
09/30/09 07:39 PM
09/30/09 07:39 PM
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West Tennessee
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rbstroker Offline
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The 440 is taller and wider than the 383 also. Think your stock exhaust will still bolt up even with the stock logs? Do yourself a favor. Do it right the first time. It'll be cheaper in the long run.


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Re: Exhaust Manifold-Question Big Block [Re: LimeliteAero] #484159
10/01/09 09:31 AM
10/01/09 09:31 AM
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SW Fla.
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Quote:

why are you swapping the 383 for the 440?

I dont understand the conversion but sticking with the choked down exhaust system?



My 383 is tired, so I pulled a 440 out of a donor C body Im rebuilding and will bolt in. My 17 year old is springing the cash for the project so the cost needs to be spread out over time. We can spend money on the manifolds and exhaust later.

Re: Exhaust Manifold-Question Big Block [Re: rbstroker] #484160
10/01/09 09:33 AM
10/01/09 09:33 AM
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Quote:

The 440 is taller and wider than the 383 also. Think your stock exhaust will still bolt up even with the stock logs? Do yourself a favor. Do it right the first time. It'll be cheaper in the long run.



Im hoping wthe exhaust will have enough flexibility to mount up to the 440. As explained above cost is an issue all at one time.

Re: Exhaust Manifold-Question Big Block [Re: CYACOP] #484161
10/01/09 10:00 AM
10/01/09 10:00 AM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

Im hoping the exhaust will have enough flexibility to mount up to the 440.


the taller deck of the 440 will move the flange outlets up/out .750" (3/4) at a 45 angle so unbolt your ex at the manifolds & see if you have enough play to move the pipes that much in that direction.


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Re: Exhaust Manifold-Question Big Block [Re: RapidRobert] #484162
10/01/09 10:29 AM
10/01/09 10:29 AM
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Indiana
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Fury Fan Offline
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This is Moparts. Budgets don't count, we don't care. You must install the parts we choose because this shall become our fantasy project, not yours!

And if that 440 is even the slightest bit tired, a stroker crank and alum heads will be debated next, quickly followed by a 440Source hijack debate.

Joking aside, don't worry too much about running logs on a mild 440 - they aren't ideal, but you can still have a strong runner if the 440 is in good health.

As mentioned already, if you have an H-pipe setup, better plan on cutting the H when going from 383 to 440. You can probably reseal it with a $13 bandclamp afterward, though.


Parts I seek: driver doorpanel, 65 Sport Fury, prefer black, needs to be 7-8 on 10 scale, might buy set 16" x 6" Dodge truck wheel(s), from early 70s?, takes 9" dogdish - need for a research job so cheaper is better. 69-73 C-body caliper brackets and/or splashields Send a PM.
Re: Exhaust Manifold-Question Big Block [Re: Fury Fan] #484163
10/01/09 10:36 AM
10/01/09 10:36 AM
Joined: Feb 2005
Posts: 3,970
SW Fla.
CYACOP Offline OP
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CYACOP  Offline OP
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Quote:

This is Moparts. Budgets don't count, we don't care. You must install the parts we choose because this shall become our fantasy project, not yours!

And if that 440 is even the slightest bit tired, a stroker crank and alum heads will be debated next, quickly followed by a 440Source hijack debate.

Joking aside, don't worry too much about running logs on a mild 440 - they aren't ideal, but you can still have a strong runner if the 440 is in good health.

As mentioned already, if you have an H-pipe setup, better plan on cutting the H when going from 383 to 440. You can probably reseal it with a $13 bandclamp afterward, though.



The car actually has just 2 seperate pipes going all the way to the back, as a matter of fact, I had to clamp strap them together in the center because the offset weight actually rotated one of them at the manifold flange, so I think I have plenty of flexibility to move them around.

Re: Exhaust Manifold-Question Big Block [Re: CYACOP] #484164
10/01/09 11:20 AM
10/01/09 11:20 AM
Joined: Jan 2003
Posts: 75,313
A gulag near you.
JohnRR Offline
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Quote:

Quote:

This is Moparts. Budgets don't count, we don't care. You must install the parts we choose because this shall become our fantasy project, not yours!

And if that 440 is even the slightest bit tired, a stroker crank and alum heads will be debated next, quickly followed by a 440Source hijack debate.

Joking aside, don't worry too much about running logs on a mild 440 - they aren't ideal, but you can still have a strong runner if the 440 is in good health.

As mentioned already, if you have an H-pipe setup, better plan on cutting the H when going from 383 to 440. You can probably reseal it with a $13 bandclamp afterward, though.



The car actually has just 2 seperate pipes going all the way to the back, as a matter of fact, I had to clamp strap them together in the center because the offset weight actually rotated one of them at the manifold flange, so I think I have plenty of flexibility to move them around.




No problem there , as long as it's not a Y pipe you'll have no issue bolting it to the 440 .

Re: Exhaust Manifold-Question Big Block [Re: Fury Fan] #484165
10/01/09 11:20 AM
10/01/09 11:20 AM
Joined: Jan 2003
Posts: 75,313
A gulag near you.
JohnRR Offline
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JohnRR  Offline
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Joined: Jan 2003
Posts: 75,313
A gulag near you.
Quote:

This is Moparts. Budgets don't count, we don't care. You must install the parts we choose because this shall become our fantasy project, not yours!

And if that 440 is even the slightest bit tired, a stroker crank and alum heads will be debated next, quickly followed by a 440Source hijack debate.

Joking aside, don't worry too much about running logs on a mild 440 - they aren't ideal, but you can still have a strong runner if the 440 is in good health.

As mentioned already, if you have an H-pipe setup, better plan on cutting the H when going from 383 to 440. You can probably reseal it with a $13 bandclamp afterward, though.




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