1 3/4" headers

rumblefish360 said
What your suggesting is a total rework of the engine to suite a header? Not creating a header to suite the engine. Which would be easier to do but crazy for 99% of us in cost.

Ether way, the parts available to the end user are one thing. In general, most end users do not have or want to exercise the grey matter or spend the insane amount of money needed for such an adventure in the math skills, machinery, contacts, time, the will or the want to create an engine at this level.

It's actually ludicrous.

We presently, the majority of the forum, live and deal with the parts available to use from the aftermarket. We do what we can with what we have. Because that's all we have.

And yet, we still go fast.
(Or as fast as the wallet allows)

Technically...that would be correct except the premise is the exhaust valve/port is too big in most heads. So........if you start over and develop a head with a smaller exhaust port and valve that leaves more room for a bigger intake valve. Hence, more flow on the intake side.

Now that the exhaust port/valve is smaller, and the intake is flowing more you have to compensate with the header. Use a smaller, significantly shorter primary, probably a 4-2-1 configuration with a relatively long collector with a significant choke point at a specific place. Now you have to have an exhaust lobe and the LSA completely different from what you would normally have.

That was essentially the coversation I had with Calvin. I had just dyno'd a very expensive set of headers that were a complete fail so I called him. We went over everything and then said his header builder screwed him. No step, fairly big tubes (2.125 on a 434 chev) with a 26 inch primary and a 4 inch collector 20-22 inches long.

They beat the stepped headers by over 80 at peak and was better than 50 average everywhere.

Headers are way more science than most think. Even the turn coming off the head is a big deal. The sharper the turn, the bigger the tube MUST be. Factory chassis cars are at a disadvantage because there is almost no way to get enough straight tube off the port.