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Southern
"STOVEBOLT"
Jamboree 2022
July 8 and 9
Lebanon TN


The Southern Bolters are planning their area get together in
conjunction with the
Southeast Truck Nationals at Cedars of Lebanon State Park (TN)


Check out the details, with new info on the Southern Bolters forum.

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Plenty of other events in the Side Lot


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Joined: Feb 2004
Posts: 24,503
H
Kettle Custodian (pot stirrer)
At one time I had over 30 years' worth of dyno run documentation, some of it recorded by my father, and some I did myself, from the high school auto mechanics shop where we both taught from 1971 to 2010, with a 7-year gap between us. That shop was equipped with a chassis dyno, a water brake bell housing dyno, and all the equipment needed to build high performance engines except a crankshaft grinder. During my tenure, an over-zealous assistant principal discarded a filing cabinet full of "obsolete" paperwork that included dyno run documentation on at least 100 engines! He didn't get a Christmas gift from me again!

Those runs proved one thing beyond the shadow of a doubt- - - - -headers, compared to stock cast iron exhaust manifolds are good for three things- - - -increasing the under hood temperature, blowing out gaskets, and burning up spark plug wires. They also rust out in a hurry unless they're stainless steel. The only measurable power gain is achieved at RPM's far above anything the average street engine ever sees, and to get a power gain that's worth the effort, each header tube must be exactly the same length from the exhaust port to the collector. The best way to achieve that is to use a collector about 6" in diameter, and let the pipes from the last three cylinders extend into it. I ran a 460 cubic inch "440" MOPAR pull truck engine with that setup, and sized the diameter and length of all the header tubes to hold exactly one cylinder's volume of exhaust gas. The tubes were about 6 feet long each. We won several pulls in the Super Stock class with that engine- - - -running one carburetor and gasoline, and producing just over 700 HP at 6500 RPM.

BTW- - - - -that "one carburetor" which was required by the pulling class we were running was not a big Holley, Edelbrock, or Carter- - - -it was a Qjet for a 455 Buick with a little bit of jetting change to accommodate the "Street Tunnel Ram" intake, radical roller cam, and ported heads were running.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Joined: Nov 2008
Posts: 48
K
'Bolter
That’s a lot of references material lost to the landfill.
Thanks for teaching what you learned from it. That information is not entirely lost in a way but that’s still a tragedy.

I’ll pull down the cast iron manifolds out of the barn and give them the business!
Then they will be ready to go back on when these pipes eventually cause trouble.
Meanwhile I’ll rebuild the Quadrajet and get it a manual choke linkage.
I appreciate you guys helping with a game plan!


Sometimes you got to leave 'em like you found 'em.
Joined: Feb 2016
Posts: 679
7
'Bolter
Does the engine still have the spread bore Q-Jet manifold or had it been changed out to a square bore? If you use the Q-Jet you'll want an intake to match.


1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto
Joined: Nov 2008
Posts: 48
K
'Bolter
I went all in with the hype and put an Edelbrock manifold on it. I still have the factory intake somewhere.


Sometimes you got to leave 'em like you found 'em.
Joined: Feb 2004
Posts: 24,503
H
Kettle Custodian (pot stirrer)
"I love it when a plan comes together!" Good luck! If you want to dress up the engine with a little eye candy, an aftermarket manifold for a Holley "Spread Bore" carburetor has the same footprint as a Qjet. I'm not even sure if those manifolds are still available, except maybe at a Swap Meet somwewhere.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Joined: Nov 2008
Posts: 48
K
'Bolter
As it turns out that Aluminum doesn’t age well If you don’t keep it polished. I will just repaint the factory manifold eventually when I make the swap later on.
I think changing the gear ratio (as you suggested first) would be the best performance modification for a stock setup anyway.
Thank you kindly for the help!


Sometimes you got to leave 'em like you found 'em.
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