New Small Block Headers

There is we'll know place around here by the name of Headers by "Ed". Some NHRA veterans have used their headers quite successfully. Ed knows his stuff! I'll put their website here. A lotta of info here by someone who's done it. I'll pull an excerpt out about collector size and how bigger is not always better.
Welcome to the Home Page of HEADERS BY "ED", INC.  May you learn a lot as you go through our website!

For what it's worth: A couple of years later (the Dodge doesn't

get worked on or raced much), the Dodge was put on a chassis

dyno, where in just three hours - nine pulls - engine timing

was advanced and fuel pressure increased with a resulting

gain of 30 HP at peak rpm plus HP gains noted everywhere else!



Two weeks later, at BIR, the best times recorded over two days were:

ET - 13.28 seconds; MPH - 100.6; 60' - 1.79 seconds!



.4 seconds off the ETs, several runs now over 100 MPH,
and a .06 reduction in the car's 60' time!) The Dodge lifts
the left tire off the track on almost every run now and even
lifted BOTH tires off track on two runs that weekend!
(First time was announced over the track's PA system!)
The "Venturi" extensions were run on Saturday (1 7/8" ID/2" OD
at the narrowest location) and 2 1/8" OD (yes, 2 1/8" OD)
tapered extensions were bolted on Sunday morning to
see what might happen. Later on that same day,
the 2 1/8" extensions were replaced by 2 1/4" extensions
and the car SLOWED DOWN!

Guys have told me (remember that I'm a "HEADER GUY")
that the collector extensions are WAY TOO SMALL
- i.e. bigger would make the car faster - yet I've tried SIX
different sizes on the headers - up through 3" - with the
best MPH measured so far using 2 1/8" tapered extensions
bolted on to the end of the headers' 3" outlet collectors.
If the collector extensions are too small (what "they" tell me),
and are, therefore (according to them), restricting
the engine, why is the Dodge doing what it is doing?
It is interesting to see how "they" deal with the FACTS of
the situation when confronted by what has actually been done:


Over time, by using various bolt-on tapered collector extensions
I have progressively reduced the effective collector outlet diameter considerably. Each diameter reduction resulted in a better
performing car. Dyno tuning provided a big gain (establishing
how BAD the engine was tuned from the factory).
2 1/8" extensions have produced the BEST TIMES seen so far.
Later on (same day), the TOO SMALL (according to "them)
2 1/8" extensions were replaced by larger 2 1/4" extensions
and the car SLOWED DOWN - PROVING that 2 1/8"
did NOT restrict the engine and, simultaneously,
PROVING that "they" did NOT know
what "they" were talking about! !

To hopefully quote Einstein correctly:
"It's better to have people think you're stupid then
to open your mouth and remove all doubt".