Do the 6 into 1 mopar headers have a better torque curve for mild slant, say 5000 rpm peak ( if that high) compaired to the shorter Clifford headers?

The longer tubes should do this, but I wander about the effects of the 6 into 1 collector as I have never run any like this.

Really when looking at these headers the 6 into 1 seems kinda odd and I wander why Mopar even went that route. They used duel for the Hyperpac, but use this setup for performance header! Why?



Jess

Probably because it was cheaper to build maybe?

I have a set of the MP 6X1 headers. I always liked them in my Duster, but they won't fit the '66 so I really don't have any good data for comparison. I always suspected the 3X2X1 Cliffords left some power on the table, but I can not be 100% sure.

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Official Cookie and Mater Tormentor.

I would rather have full length 3-1 headers with a Y-pipe than 6-1 headers. The reason being is it makes more torque and therefore more horsepower. The 6-1 collector is too large especially if you prefer merge collectors over baffle collectors. The Y-pipe on 3-1 headers acts as collector extensions boosting low end torque over the 6-1 and shouldn't cost much if anything in high RPM torque. I have shorty Clifford headers only because long headers are so expensive.

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Joshua

Weren't the original hyper-pack "headers" cast iron? I seem to remember reading this somewhere. If they were cast iron, I can see why they were 2 piece 3 in to 1's.


TopHat

Yes they were.

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Official Cookie and Mater Tormentor.

Lucky13,

When my wife and I were back at Chrysler Head Quarters for some meetings a few years ago I was introduced to Pete Hagenbusch - a SL6 engine development engineer. We spent one afternoon with him as he took us through the museum tour and he told us stories on how he and his team used to hot rod the SL6. I was all ears and took lots of notes. We also bought about $300 in books.
He was very nice to share specifics. On the item of headers he suggested to go with a 3 into 1 combination with tubes at 34 to 36" in length with 2.5" diameter 12" collectors. He said the engine really responded well with them along with a .10 of the block for a little more compression. He said the engine has allot of torque that we never realize with short manifolds or headers. He told many, many stories of the crazy things his team put the SL6 through. They tried all different length setups. The headers in a cast version that they made never went into production because the engine made as much power with them and the 4 barrel setup as a 318 at the time and the big boys didn't want to spend the extra money. He thought the Offy or Weiand manifolds were a good idea and that the Super Six was a must do as a minimum.

The tour of the engine shop was just awesome. Each engine on it's own test stand ready to go.......was quite a site.

So if we could get them, that would be the best combination for torque and power. I did ask the question about duals verses single exhaust. He said 2.25" single was a good compromise. The 2.25" duals were far better with 2" tail pipes. He likes the "X" pipe for the added HP. Pete said it really helps to realize the engines torque potential.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Here is a photo

DD

Now thats a coffey table



Jess

Notice the square runners on the cast manny's , there seems to be something coming to the surface about square tube headers. There has even been a new patent issued for them, and some pretty interesting claims. No to meantion some very odd looking headers



Jess

I've also heard that 6 into 1 collectors don't give good scavenging. A 3 into 1 header will combine the pulses better.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

Here's another photo of the cast iron Hyper Pak headers. Chrysler certainly made some nifty high performance exhaust manifolds, back in the day.

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Blair Furlotte
1979 Dodge Aspen 225 "Super Six" 3-speed
Original owner

Somebody should Recast those. That'd be sweet!

The hyper pak cast headers do look cool! Does anyone know if there is a header manufacturer that produces something close to the specs that Aggressive Ted describes? Thanks!

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66 Lil' Red Piggie Valiant (Mater Crusher) - Thanks Zilla!!!!! 72 Demon (Number 1 Son's)

I think the Hooker headers are the closest to what was described, but are a little longer so will favor the low end a little. Also, you'd have to add a collector extension, but that's cake.

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Joshua

Jess,

The HOK-5602HKR Hooker Super Competition Headers (Summit part#) is about as close as we are going to get to what the Chrysler engine team made from what I saw while I was there at Chrysler. Eventually I will get a set after building or adapting water heat to my Weiand four barrel manifold.

An "X" pipe and duals here we come.....

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG