PAW Tunnel Ram manifold?

Discussion of the 331-354-392 HEMIs.

Moderators: TrWaters, 392heminut, scottm

Post Reply
NE57
Posts: 192
Joined: Fri Mar 27, 2009 12:54 pm

PAW Tunnel Ram manifold?

Post by NE57 » Wed Sep 23, 2009 1:41 pm

Anyone try one of these? What'd you like/dislike? How's it work for street?

Unfortunately their catalog gives no details as to rpm range. All it says is runners are "sized for good throttle response and driveability"... open to interpretation.

speedicusmaximus
Posts: 143
Joined: Thu May 18, 2006 11:31 am
Location: UK

Re: PAW Tunnel Ram manifold?

Post by speedicusmaximus » Thu Sep 24, 2009 4:29 am

NE57,

Which Hemi is it for - 1st, 2nd or 3rd generation ?

Can you provide a link or scan of the page ?

Thanks,

Mike
Beep ! Beep !

NE57
Posts: 192
Joined: Fri Mar 27, 2009 12:54 pm

Re: PAW Tunnel Ram manifold?

Post by NE57 » Thu Sep 24, 2009 9:55 am

I confess...I'm a techno-no-know, I can't figure out how to copy and paste a snapshot from a pdf. But its #5750 from PAW's downloadable hemi web catalog page 39 for the 1st generation 392. It has removable top plates for a variety of carb configurations similar to the Hot Heads version.

OK. I just went to PAWs regular site and apparently while they still show the top plates they no longer list the manifold itself. I wonder if that says something. Like lack of demand?

I've seen the hotheads manifold come up on ebay once or twice, and the weiand 2x4 seems to be semi-regular offering but never the PAW unit. Oh well.

TrWaters
Posts: 390
Joined: Fri Dec 14, 2001 6:00 pm
Location: Vermont
Contact:

Re: PAW Tunnel Ram manifold?

Post by TrWaters » Thu Sep 24, 2009 4:26 pm

Here is my modified PAW tunnel ram with a Hogan dominator top. The second picture is an original A.I.U. which the P.A.W. seems to be based upon.

Image

Image

Image
Early hemi to late sb Mopar trans adapters. Precision billet parts for early hemis.

NE57
Posts: 192
Joined: Fri Mar 27, 2009 12:54 pm

Re: PAW Tunnel Ram manifold?

Post by NE57 » Sat Sep 26, 2009 12:44 pm

Why are the bolt holes welded up?

TrWaters
Posts: 390
Joined: Fri Dec 14, 2001 6:00 pm
Location: Vermont
Contact:

Re: PAW Tunnel Ram manifold?

Post by TrWaters » Sun Sep 27, 2009 8:31 am

With this type of intake, you will see that the port size is compromised..... due to the original bolt hole location. Note the indentations in the AIU runners for bolt clearance. That extends into the port itself, limiting porting.

If you look close at my intake, you will see there are still 4 bolts per side being used, in the stock location.... but of a smaller diameter than stock.
Early hemi to late sb Mopar trans adapters. Precision billet parts for early hemis.

Feral child
Posts: 6
Joined: Tue Jul 07, 2009 5:36 pm

Re: PAW Tunnel Ram manifold?

Post by Feral child » Sun Sep 27, 2009 2:55 pm

A question for TR Waters:

I have never seen one of these units off an engine, but as I recollect PAW stated that the runners are sized for good street performance (or something of that sort) - In your evaluation then, are they on the small size for serious performance work as with the large Dominator?

Thanks in advance for any input.

-Fc

TrWaters
Posts: 390
Joined: Fri Dec 14, 2001 6:00 pm
Location: Vermont
Contact:

Re: PAW Tunnel Ram manifold?

Post by TrWaters » Mon Sep 28, 2009 7:51 pm

In my opinion, they are a bit small as-cast for serious H.P.
These pictures show the as-cast ports under a Mr.Gasket (or BEST Gasket) "Large Port" intake gasket. There is no way to open the runners up without welding or epoxy.

Image

Image
Early hemi to late sb Mopar trans adapters. Precision billet parts for early hemis.

Feral child
Posts: 6
Joined: Tue Jul 07, 2009 5:36 pm

Re: PAW Tunnel Ram manifold?

Post by Feral child » Mon Oct 26, 2009 5:59 pm

Many and belated thanks Tom- the core placement control isn't really awe inspiring either! Looks to me like it would be almost as much work to correct one of these as to fab a good sheet metal unit.

oldngood
Posts: 121
Joined: Thu Mar 13, 2008 5:14 pm

Re: PAW Tunnel Ram manifold?

Post by oldngood » Tue Oct 27, 2009 5:51 pm

the manifold appears to be made to match the early small port/small valve 1951-53 hemi heads, by the looks of the ports

I have run single 4 barrel ram manifolds before, and they run well. They don't have the part throttle response of a dual plane, or single plane conventional manifold, but they have more power above 4000 rpm and flow a ton of air- it's a straight shot at the back of the valve from the carb

I'd still run the single 4 bbl ram, rather than a stock cast iron 4 bbl intake, or dual plane aluminum intake single 4- the ram makes the engine feel like it will never stop revving.

NE57
Posts: 192
Joined: Fri Mar 27, 2009 12:54 pm

Re: PAW Tunnel Ram manifold?

Post by NE57 » Sat Mar 20, 2010 11:22 am

TrWaters wrote:With this type of intake, you will see that the port size is compromised..... due to the original bolt hole location. Note the indentations in the AIU runners for bolt clearance. That extends into the port itself, limiting porting.

If you look close at my intake, you will see there are still 4 bolts per side being used, in the stock location.... but of a smaller diameter than stock.

Tom, when you say the bolts are of a smaller size, do you mean the threads are the same size as stock but the bolts have a smaller head(hex head maybe)? Or, have you done something so the heads will accept a smaller diameter bolt thread?

I have a pair of manifold adapters. I plan on using these as the base to build a manifold similar to what we're discussing (well I'm gonna try anyway). I've found some alum round tubing available in a size that when reshaped to the rectangular port should be pretty darn close and with a wall thickness of .125" hopefully would minimize the bolt interference issue, but we'll see.

When I actually start fabrication I'll take lots of pics and post them. I'm sure I could use advice and opinions along the way, since this will be my first ever attempt! So expect stupid questions.

Post Reply