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Old 11-25-2019, 12:10 AM   #46
Z0622
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I thought the water in the toilet and drain swirled one direction in the northern hemisphere and the opposite on the other side of the equator, just like storm clouds swirl. Who knows anyhow i did a set and they worked really well, that motor made more power than it should have but I can't say it was the headers. They were not equal length but not thst far off. I also remember something about the total primary tube length. In a step header the first tube off the flange should be 6-8 inches.
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Old 11-25-2019, 07:04 AM   #47
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I got the idea that he prefers long, sweeping bends to achieve the desired length(s) and that the consideration of equal length or not was separate from the straights and bends necessary to achieve that.
Correct!
Two seperate considerations.
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Old 11-25-2019, 09:39 PM   #48
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Correct!
Two seperate considerations.
With it being difficult to fit the perfect shape in a street fox body would you care to guess at the hp difference between a perfect set of headers and a fairly good set of headers the same size at around the 800 hp level.
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Old 11-26-2019, 06:27 AM   #49
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With it being difficult to fit the perfect shape in a street fox body would you care to guess at the hp difference between a perfect set of headers and a fairly good set of headers the same size at around the 800 hp level.
Tough to say, but I imagine 5-25+, depending on how "fairly good" they were!
We see 1-3 between a perfect set, and a more perfecter set! Lol
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Old 11-26-2019, 08:45 PM   #50
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Default Re: Header Clocking

That's a lot! I didn't expect it to be as high as 25+ hp. I wish it was easier to send pics, I'd like your opinion on the set I just got, they have nice bends but definitely have some questionable ones also, but they fit A3's in a fox so... lol
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Old 12-02-2019, 12:31 AM   #51
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Default Re: Header Clocking

Warp, what do you see and decern from excess psi in the exhaust system?
We go faster when we reduce psi in exhaust. I guess that would be back pressure.
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Old 12-02-2019, 01:34 AM   #52
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Default Re: Header Clocking

I think it all goes to efficiency. A more efficient header design can reduce intake reversion and provide a stronger booster signal.



There is a lot more to getting there however. Combustion chamber design and cam events are part of the equation as well.
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Old 12-02-2019, 07:59 AM   #53
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Default Re: Header Clocking

Man.... I'm worn out on headers. I'd say the length, and the cam has to work together. The shorter the primaries the more picky it is about valve events.

Hate to admit that big tube dyno headers with minimal bends won't make more power than a proper header with many bends.... Ugh....

Not sure about the firing order. All my customers tend to do that as a criteria but I've never backed it up to the exact same header, with no firing order pattern.
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Old 12-02-2019, 01:58 PM   #54
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I see the MBE quench marathon is droning on.
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Old 12-02-2019, 03:52 PM   #55
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Default Re: Header Clocking

MBE?
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there is nothing in an LS that will support more hp per CID than a Gen 1... absolutely zero.
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Old 12-03-2019, 02:59 AM   #56
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Default Re: Header Clocking

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Equal lengths aren't typically the way to go in most NA engines.
but how unequal would/could you go? all within 4" is near enough?
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