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Since we have diesels and dont have throttle bodies to worry about you can almost design the intake any way you want.
Makes intakes a lot easier to design.
Basicly you are measuring the distance from the intake valve area to any surface that opposes it. So the distance from the intake valve to the back wall of the plenum in side the intake manifold, an example of this would be a tunnel ram, these typically have shorter runners.
Or you are measuring from intake valve to intake valve on duel plane manifolds found on V8 engines, these always have longer runners.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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