Are big bore headers big enough ?

Frode,

The collector of the Big bore headers were made to mate with the oem Pantera tail pipes, this is way too small for even a 351 cubic inch motor. The performance of the header was compromised because the design goal was to have a header that integrated with the oem exhaust system.

You want at least 1 7/8" (1.875") OD tubing collecting into at least 2 3/4" (2.750") tubing for even a 351 cubic inch motor. I know PPC manufactures headers with those dimesnions for the Pantera.

2" tubing collecting into 3" tubing would not be too big for your stroker motor. But I'm not aware if that is available.

Tail pipes between collectors and mufflers will need to be 2 1/2" at a minimum, 2 3/4" or 3" would not be too big. No need to use tubing bigger than the collector however.

The Ansa mufflers will most likely be too restrictive as well. Something like the new mufflers sold by PI will be in order, I think the PI mufflers are Magneflow brand.

Your friend on the DTBB, George

George,

Could we cut off the collector to the point where is is reduced to about 2.5 or 3.0 and do the same for the muffler then fabricate a new intermidaite pipe to connect the two ?? I think Hooker makes extention tubes for headers with flanges that could be used for a fabrication.

Ron

If the individual tubes aren't at least 1 7/8" OD it wouldn't be worth the effort.

Your exhausted friend on the DTBB, George

I measured a set of Big Bore headers that I bought off ebay and they are 2.5 outlet. Just 'cause you bought them , don't mean you can't send them back! Too tight for strokin'

Just to take a step back, what are the stock headers in terms of tube and collector OD? I assumed my headers were stock and they have 1 7/8" OD tubes?

Julian

Thks for top feedback !

Now my question is PPC ? link or phone pls. !!

Best regards
Frode
Oslo
#1155

Frode,

There are 2 PPCs! Pantera Performance Center of Colorado, and Pantera Parts Connection of Reno Nevada. Pantera Parts Connection (Larry Stock's business) has the headers I referred to previously.

There are links on the PI home page and the POCA web site to most of the Pantera vendors. I suggest you give each vendor a phone call and inquire as to what they offer in the way of headers, because I do not know what all is available myself. Hall Pantera, Pantera Proformance, PI Motorsports, Pantera Performance Center, Panteras by Wilkinson, Pantera East; they all deserve a call.

Your friend on the DTBB, George

quote:

Originally posted by Joules5:
Just to take a step back, what are the stock headers in terms of tube and collector OD? I assumed my headers were stock and they have 1 7/8" OD tubes?

Julian

Stock headers have tubes meausring 1 11/16" OD or 1 13/16" OD, depending upon where you take the measurement. The oem headers on my '74 L look like those in the picture below.

Your friend on the DTBB, George

Gosh. My headers don't look nothing like that. They come down from the block and like curl all around each other into a big mother tube. It is like coffe can diameter, at least it seems that way when you are under the car looking up at them. And then my muffler is like two giant glass packs, side by side withe seperate resonator tubes comming out of them. When I do my tech article this winter I will take pictures of them for ya.

What you describe seems like a full Hall big bore system, headers & tail pipes.

Your bud on the DTBB, George

George
Not to sure what you were talking about,
your new avatar mad me loose concentration
on what I was reading....
Now Im really confused
Dennis

Sorry Dennis, let Nora help you regain your concentration:

When I bought my heads from CHI (I have the 218cc versions) John told me go with 2 inch header primary tubes and 3" for collectors and mufflers. Smaller would be restrictive. The Pantera has its fitment limits and off the shelf headers fitting that dimension dont exist (or didnt a few years ago). Your stock muffs wont work well at all. I'm not saying you cant drive it that way, its just you wont get the maximum potential results. PPC headers or PI headers are close without going custom made. Send the Hall units back. I sold my Halls and got PI big throat. They work pretty good. (No Dyno numbers)
David

quote:

Originally posted by george pence:
What you describe seems like a full Hall big bore system, headers & tail pipes.

Your bud on the DTBB, George

Thanks George. I have bought all my stuff from hall because when I bought the car the guy had Hall Pantera catalogs with the car. I have always thought it was pretty good stuff, and he must have too.

I know this is off subject, but are you thinking of marrying Nora??

quote:

Originally posted by DeTom:
I know this is off subject, but are you thinking of marrying Nora??

Marriage? That's an eight letter word, twice as bad as a four letter word. No thoughts of marriage with Nora.

By the way, Nora said Dennis was sweet, and if he were here, she'd give him a big kiss. Too bad Dennis.

Your bachelor friend on the DTBB, George

Between George's (ever changing and enjoyable new) avatars and the cast of characters hanging around his bachelor pad, someone should tell Dave Adler that it looks like the "nude photos" thing is already being handled.

George
Nora is hot!
I know this part of the BB is meant to be about engine's
but can you give me more info on Nora....
PS Is she a friend of yours or is she from a magazine,
if she your friend i've definately got to hang with you!
Your long time and best friend from Australia
Dennis

Dennis,

Nora's been balanced and blueprinted, she's naturally aspirated, she redlines at 11 PM, dyno'd at 105 lbs, she requires daily maintenance to maintain her high performance looks. Nora runs on high octane / low calorie fuel, and unlike your moderator, she does not burn alcohol.

George

quote:

Originally posted by deeb:
Between George's (ever changing and enjoyable new) avatars and the cast of characters hanging around his bachelor pad, someone should tell Dave Adler that it looks like the "nude photos" thing is already being handled.

David, cast of characters?

George
If these babes are your friends, then there is only one thing for me to do!
Move countries
and hang with you.....
Dennis

quote:

Reply Admin New PM!

I am not shure, as my english is limited, but dimentions for these ?


Frode
Oslo
#1155