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McJack's Headers for 70 BB w/ AC

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Old Nov 24, 2013 | 09:13 PM
  #1  
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Default McJack's Headers for 70 BB w/ AC

Anyone have experience installing and running these in a 1970-74 BB with A/C? Any fit or heat issues? Are they truly a direct fit to existing exhaust withOUT modification? Thanks!

70 - 74 Corvette Big Block 2" Factory Cast Iron Replacements

SKU: BBCC2X2156382

http://www.vetteheaders.com/servlet/...ders%2C/Detail
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Old Nov 27, 2013 | 12:44 PM
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Keith88
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Anyone?

After some research I decided to bite the bullet and buy the McJacks at Vette Central given the "free" shipping promo running. They assured me it was a "direct fit" replacement for the stock manifold. I have the original manifolds and wanted to keep the exhaust "stock" configuration unmolested. I will post how it turns out. Just wanted assurances from someone that actually installed these before I committed.
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Old Nov 27, 2013 | 01:06 PM
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I can't see that there would be enough of a benefit to replace a 2" outlet manifold with a 2" outlet shorty header, especially for what they cost. You can get a long tube header set and the section of exhaust pipe that connects through the crossmember to your stock pipes from Hooker (at least you can for a small block). I have a set like that on my 77.
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Old Nov 29, 2013 | 12:53 AM
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Originally Posted by CaseyJones
I can't see that there would be enough of a benefit to replace a 2" outlet manifold with a 2" outlet shorty header, especially for what they cost. You can get a long tube header set and the section of exhaust pipe that connects through the crossmember to your stock pipes from Hooker (at least you can for a small block). I have a set like that on my 77.
http://www.sandersonheaders.com/Lets-Get-Technical.html
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Old Nov 29, 2013 | 01:53 AM
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So you are running a blower? If so I agree as scavenging isn't as necessary as the blower is forcing air into the cylinders.

If you are N/A then long tubes will make more power.
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