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They are most likely 180 degree cranks like the VFR, NC13-NC24 had 180 degree cranks, NC30 & 35 had 360 degree (like the RC30/45 and early VFxxxF). Of course they could have later motor swaps or crank/cam swaps. IDK if the earlier engines are compatible with the later parts though.

Hi MBrane - if wade sticks to his commitment to hand over completed headers next Thursday, we can set up a time for you to pick up yours. If the 5/8 gen muffler fitment exercise hasn't yet taken place, bring your pipes, and we'll see how things line up. This is prototype 2 packed and ready to ship to VFRD member carlgustav in Alabama. Once again I am confronted by my poor before-and-during photo-taking habits. That significant hunk of cardboard is 36x16x16" to allow minimum 2" on every side of the headers for protective packing material.

If all goes according to plan, the new 8 gen headers will be the same as the new 5/6 gen headers from the collector exit all the way forward [including the rear primaries] until the front sections of the two front primaries. Ken, yesterday Wade assigned us homework that pertains to your question about 6 gen fitment : to help foresee any fitment issues with the collector exit of the new headers for 8 gen, we are going to attempt to fit OEM mufflers and aftermarket slipons from both 8 gen and 5 gen to both of those bikes - gonna throw a multi-pipe mini-swapmeet party. Four mufflers, two bikes, no rules, best fit takes all. Even if the muffler hanger mount holes/brackets are in different locations, we will get a rough idea of whether collector exit length, angle, and position line up between the two motorcycles. If they line up as expected [Or should I say as hoped?], we can relax a tiny bit. Fitment of 6 gen dual high mount mufflers can be extrapolated from the results of the 8-5 gen muffler exchange matrix because we had to cut 5/8" off the new 5/6 gen header's collector exit before the 6 gen OEM mufflers fit correctly on a 6 gen motorcycle. After the cut, OEM 6 gen mufflers fit perfectly.

Sorry, it's all I could think of...