Ever wish you knew about header collector design when no one else did?

[PackardV8]

I was there back in the day when 12" stubs were the racing exhaust of choice.



Couldn't have kept it a secret for long, but how much more horsepower would those Chet Herbert roller cam, Enderle injected, 12:1, 301"s have made back in '62 if they'd had a best science header and collector?

[Tom68]

They had appropriately sized headers in '62 on Chev powered Sprintcars and modifieds, anything else would have been a budget thing.

Tuned length was all the rage here in '63.

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[PackardV8]

They had appropriately sized headers in '62 on Chev powered Sprintcars and modifieds, anything else would have been a budget thing. Tuned length was all the rage here in '63.

Yeah, I starting going to short track around '61, so tuned length wasn't a thing in Alabama in '61-'62. I remember a foot of flame out the stubs.

[Tuner]

That's nothin' compared to the revolution in 2-strokes with the "reverse cone" expansion chamber came along in near the same era. When we started playing with that idea I about drove my HS shop teacher crazy rolling cones. For "extra credit" he made me make drawings and do the math before I could use the roller. LOL 50cc Tohatsu test mule. Good times.



How about the "trick" when we painted the collector extensions and cut them where the paint burned off.

[Walter R. Malik]

That would be a LONG time ago ... the Phillip H. Smith book was first released in 1962. Re-printed and released several times afterward.

[Walter R. Malik]

That would be a LONG time ago ... the Phillip H. Smith book was first released in 1962. Re-printed and released several times afterward.

Oh yea; the title of that book is "The Scientific Design of Exhaust and Intake Systems".