BTW if it proves to be a problem (and I am no way convinced it is) it could be
beefed up by welding a short section of 1/8th inch plate to it.
It still makes the cheapest and lightest with the lowest pressure
drop of any throttle body/plenum  you can find. A brilliant idea if I do
say so myself :)

Paul Lamar

Paul, If engine vacuum causes the 1/8 wall TB to collapse I'll be amazed. I did high vacuum equipment as my engineering work and a perfect vacuum, measured in
millitorr, you might have .010 total deflection. The extrusion is much tougher than the glassfilled nylon airboxes that are being used on all the cars now.
The highest vacuum you are likely to see is around 24-28 inhg and that only when closing the throttle at full revs. The plate never closes completely if we
want the engine to idle!
Bill Jepson

 
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