header primary size on a 496
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dfree383
crittersf1
rmcomprandy
72mav
8 posters
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Re: header primary size on a 496
dfree383 October 4th 2014, 9:21 pm
rmcomprandy wrote:bbf-falcon wrote:That ain't no big cam..... and shifting at 7200 is about right for an engine peaking at 6700....
Now i know why you race dyno's instead of cars.
A step header with 2" to 2 1/8" primary tubes 31 inches long with a 3 1/2" diameter collector 17 inches long is the correct size for a 496 engine at 7,000 RPM ... on a dyno OR a drag race car.
USE a 2" straight tube header primary if the RPM level EVER drops below 5,000 RPM.
And that's what I learned from all the dyno time......
When's the last time your car was on the track Rick?
dfree383- BBF CONTRIBUTOR
- Posts : 14800
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: header primary size on a 496
bbf-falcon October 5th 2014, 9:36 am
One thing I learned in 40yrs of racing is that just because my engine will rev to 8k, that's no reason to shift it there . and a dyno is not a racecar.
and a dyno is not a racecar.
bbf-falcon- Posts : 8995
Join date : 2008-12-03
Location : Jackson, Ohio
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