225 /6 at 250HP?
Yes, that is the perfect carburetor for this buildup. Perfect! Use the modifications described in "Hangar 18" website and monitor the A/F ratio with you new O-2 meter and you'll be fine. Holley sells a 2-box set of jets (all sizes) to enable that. Get a set...
The O-Rings are for cylinder-sealing and encircle the tops of the cylinders on top of the clock. See picture below...
O-Rings are common practice for forced induction motors because cylinder pressure under boost goes high enough that a standard head gasket won't contain it; it will blow out. The O-Rings form a high-pressure seal and prevent that. The cutter is pretty much fool-proof, so don't sweat doing it; the way the tool is designed, it's pretty much impossible to mess it up. They give you copper wire to fit into the groove. Cometic doesn't make a multi-layered-steel head-gasket for the slant six, so I used a Fel Pro gasket that has a fire ring around the cylinder. I centered the O-Ring on that fire ring (it's about an eighth of an inch wide, and it wasn't hard to do because the cutter is adjustable as to width.) There are two different-size cutters available; you'll need the smaller of the two.
Good luck! You're gonna LOVE the way that thing runs...
Yes, that is the perfect carburetor for this buildup. Perfect! Use the modifications described in "Hangar 18" website and monitor the A/F ratio with you new O-2 meter and you'll be fine. Holley sells a 2-box set of jets (all sizes) to enable that. Get a set...
The O-Rings are for cylinder-sealing and encircle the tops of the cylinders on top of the clock. See picture below...
O-Rings are common practice for forced induction motors because cylinder pressure under boost goes high enough that a standard head gasket won't contain it; it will blow out. The O-Rings form a high-pressure seal and prevent that. The cutter is pretty much fool-proof, so don't sweat doing it; the way the tool is designed, it's pretty much impossible to mess it up. They give you copper wire to fit into the groove. Cometic doesn't make a multi-layered-steel head-gasket for the slant six, so I used a Fel Pro gasket that has a fire ring around the cylinder. I centered the O-Ring on that fire ring (it's about an eighth of an inch wide, and it wasn't hard to do because the cutter is adjustable as to width.) There are two different-size cutters available; you'll need the smaller of the two.
Good luck! You're gonna LOVE the way that thing runs...