Quote:
Originally Posted by g6civcx
You guys with LS-series motors should have a shorter intake, but somehow every LS swap I've seen, yours included, puts the intake higher than my carb.
Have you considered going through the firewall and moving the firewall back 6" or so?
Nice work nonetheless.
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The SBC has a lower deck height than an LS1. The LS1 also has much deeper skirt. And I built my pan with enough clearance for a 4.125" stroke. Most SBCs are only running a 3.5" stroke I believe. So of course they can have the bottom of the pan sitting that much closer to the block, thus allowing the entire engine to sit that much lower.
Even with this relatively tall single plane on an LS1 (I'd bet you're intake isn't this tall) you'll notice that the carb base is not taller than the fuel rails.
Also the LSx style plenum under runner intakes aren't as low as you might think. Here's the Al BBK intake for the LS1
These 4 things together, incrementally, make the LS1 look quite a bit taller than a SBC.
And regarding the fire wall. I really did want to cut it, but that would relegate me to a different class in nasa time trials among others. I believe it also forces you to have a heavier cage in other sanctioning bodies.