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 Post subject: Header size question
 Post Posted: Wed Oct 31, 2012 1:25 pm 
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Joined: Thu Aug 02, 2012 12:54 pm
Posts: 21
How much power have you seen with a 1-3/4" primary tube on a 400 cu in sbc?


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 Post subject: Re: Header size question
 Post Posted: Wed Oct 31, 2012 10:48 pm 
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Joined: Tue Apr 18, 2006 3:20 pm
Posts: 1457
Location: Missouri
When the Pro-Stock trucks were running (10-15 yrs ago) I saw some of them with 1-3/4" stepped to 1-7/8". Not sure if they were 3-step or just 2, but they started out at 1-3/4". Those engines made 900+hp and were 358ci if I remember correctly.

Rick


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 Post subject: Re: Header size question
 Post Posted: Thu Nov 01, 2012 7:22 am 
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Joined: Wed Apr 19, 2006 8:20 pm
Posts: 5852
Location: N.J.
I remember Grumpys vega having some strange steps on his headers..

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running E85
Best ET 8.07
Best MPH 170.71
Barry


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 Post subject: Re: Header size question
 Post Posted: Thu Nov 01, 2012 12:28 pm 
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Joined: Thu Aug 02, 2012 12:54 pm
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Forgot about the PS trucks. they spun them past 10k too.


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 Post subject: Re: Header size question
 Post Posted: Mon Dec 17, 2012 6:08 pm 
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Joined: Thu Feb 16, 2012 7:35 pm
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I have found on bracket style 23 def 400-430 inch engines...670hp seems to be the brick wall

When I put a 1 7/8 into 3.5 collector they jump up 15 to 20hp


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