Starting

The intake ports on the 2000 Head would use a 1.5" ID oval to round tube if the head was ported slightly so I shopped for a set of ITBs that have the matching runner size as the 1.5" ID ports. I came across a set of 2001 Suzuki GSX-R 600 ITBs. They have 41mm ID inlets and 38mm ID outlets which will mate up well next to the 1.625" OD tube runners. These four tubes will be welded to a 3/8" laser cut aluminum head flange and attached to the ITBs with a set of 4 - 1.625" ID silicon couplers. On intake side of the throttle bodies I will be adding velocity stacks to help increase the runner length and therefore use the ram affect more efficiently to help my low rpm driving around town and general need for torque. Velocity stacks also gather and sort the air more efficiently allowing more air into the cylinder each time the valve opens. I will be making the ITB setup 11" long from the intake ports on the side of the head. This will allow 3 intake strokes worth of air to be inline to pack the first 1 in faster. These velocity stacks will need to be 110mm long to fit next to my ABS block. This will allow the throttle bodies to be located 2/3rds of the way down the full intake runner.These ITBs from the GSX-R 600 are going to work perfectly for this engine.

Inlet side is 41mm ID and 45mm OD

Outlet side is 38mm ID and 42mm OD

 The port spacing on the ITBs do not match the port spacing on the head. The ITBs port spacing is 80mm while the heads ports are 90mm. I will have to had 10mm spacers between each of the throttle bodies mounting points. This will make the setup too long for its original bolts. I will need to get 2 - 280mm long M8x1.25 bolts. This also means I will need to weld on extensions to each one of the throttle control arms so they can still all link up correctly using the stock adjusters.