F B -HEADER S

[fatboy0054]

I WAS TOLD FOR MY CAD ! THAT INCH AND THREE FORTHS TUBES 38 INCH LONG ,3 IN COLLECTORS 12IN LONG ! REDUCE TO TWO AND A HALF PIPE IS GOOD FOR UP TO 800 HP HEY SOME INPUT ! THANKS AM GOING TO DO MYSELF !

 

[Waterthunder]

The tube length of a header dictates what RPM a motor develops peak torque. The longer the primary tube the lower RPM's a motor will develops it's peak torque. The shorter the tube the more RPM's you must turn it to develop the same amount of torque. If there is ever a motor that needs long tube headers it's an aircraft turning less then 4,000RPM. The header you talked about will work fine for a Caddy there are sooooo many factors when picking a header but the header you mentioned is a all around good header for a caddy motor. Now if you had more inches or turned it more then 5,500RPM everything would be different. It doesn't matter what the header flows, or is rated at you need a header that generates torque and power where you need it and still scavenges the next cylinder well. I shouldn't state this but in an airboat never pick the header that produces max HP instead go with the broadest performing header that performs best at the RPM's you will be running it at.

 

[fatboy0054]

THANKS DAVE I GOT THAT FROM EDS HEADERS I FILL OUT THE SHEET AND TOLD HIM WHAT IT WAS FOR THATS WHAT HE GAVE ME THANKS !GOING TO TRY TO MAKE THEM ! I WAS HONEST WITH HIM ABOUT SPECS AND WENT A LITTLE LOWER .JUST TO GET IT RITE ! HE SAID 5500 ! CAM GUY SAID MY CAM WOULD FALL OUT !5500 ! SO SORT OF THE SAME PAGE ! REALLY THANKS !

 

[Anonymous]

Thunder made a great point about making a broad torque curve.

One thing I hear helps that is actually having different length primaries. There's a lot of talk about equal length headers for racing, but if each tube is a different length then it is tuned to a different rpm. If each cylinder has its own "optimum rpm" then it stands to reason the engine should have a broader torque curve.