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I know that there is a difference in the thickness of the flange that mates to the head . Not sure if this # denotes that thickness , but it has to be the same as it intake manifold thickness the mounting washers are flat on both the intake and exhaust manifolds.
Has nothing to do with performance.
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<div class="">paul</div>
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<p class="MsoNormal" style="margin: 0in 0in 12pt; font-size: 12pt;">Paul Osborne<br class="">
Department of Electrical and Computer Eng<br class="">
University of Rochester <br class="">
201 Hopeman Building RC<br class="">
Rochester NY 14627<br class="">
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<div class=""><span class="Apple-style-span" style="font-size: 16px;"> 585-275-5226</span><span class="Apple-tab-span" style="white-space: pre;">
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<div class="">On Dec 7, 2017, at 7:07 AM, daybell7--- via Mgs <<a href="mailto:Mgs@autox.team.net" class="">Mgs@autox.team.net</a>> wrote:</div>
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<div class="">I found some HS4s in the dungeon and am replacing the weber and header on my 1968 GT, but still need the stock exhaust manifold. I see the manifolds stamped with two numbers: 12H709 and 12H3911. <span class="Apple-converted-space"> </span></div>
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<div class="">Is there a difference between the manifolds? One for HS4s and one for the HIF carburetor? My 72 MGB has HIFs and the 12H709 manifold. I don’t think it matters.</div>
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<div class="">Thanks, Steve Hughes<br class="">
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