joe603 wrote: The spacer allows the rear cylinders to get sufficient flow as well, due to the design of the plenum.
I'm guessing a typo and you meant front right? The TB is near the rear cylinders , so as soon as air enters the plenum it's the fronts that starve a little bit. Hence the staggered spacers are thicker near the front so the front cylinders get more air. The same goes for aftermarket plenums, they are taller near the front to compensate for the downward slope of the stock plenum. Maybe I just read your post wrong.....I promise I'm not trying to
at cha! just want things to be clear