It would take helium to make the average Mk3 owners wallet lighter ;)
OP: Don't think a spacer has enough volume to make any real difference, I played around with plenums from 2 litres to 7 litres and they just change the "hit" from the Turbo.
I ended up sourcing a Kiekhaefer Marine 402 Block as a replacement, ironic part is my LS project engine is now a 402Ci thanks to the unplanned 4" stroker crank I picked up today ;)
Hmmm dunno, never opened up a "factory" GTE, last one I built the owner had already pulled it down and replaced the stock slugs with Ross forged when it got to my place..
Be interesting to find out what it is!
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