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| | |-+  I cut open a TFS-R upper
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Author Topic: I cut open a TFS-R upper  (Read 794 times)
Super_Dave
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« on: August 30, 2014, 07:39:55 PM »

I picked up one of these to use on a 347, but wanted to see what the inside looked like, so I cut it open. Several people had said the holley SMII upper works so much compared to the TFS and I wondered why.

First off here's a Holley SMII, notice the nice fat lip for the transition from the crossover to the actual ports.



and the TFS, thin lip makes the air have to do an abrupt turn.



I numbered the runners according to the cylinder they feed



On this one you can see a small, maybe 1/8" high bump that I think is to help get the air to make the turn. You can also see the little vane on the back of the bolt support



Finally this is the look toward the plenum from the throttle body.


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jayh
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« Reply #1 on: October 14, 2014, 03:02:31 PM »

I was looking at a box R in Norwalk and wondered/pretty much assumed the holley has larger cross section
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rmcomprandy
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« Reply #2 on: July 27, 2016, 08:35:03 AM »

I was looking at a box R in Norwalk and wondered/pretty much assumed the holley has larger cross section

If the photos here are all on the same scale ... the TFS runners have more taper and a larger cross-section.
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