THIS IS A D&D 640 CC BILLIT HEAD SET WITH INSERTS I REMOVED FROM MY 2003 440 SNO PRO WITH A 640 D+D MOD MOTOR. THE INSERTS ARE 23.5 CC VOLUME AND REQUIRE RACE FUEL.  IT WAS WORKING FINE AND IS IN GOOD SHAPE. THESE WOULD FIT A SET OF D&D JUGS. IF YOU BUY ALL THE PIECES OF THIS KIT IT SHOULD WORK GREAT ON A 440 OR F-5. IT IS BEING SOLD AS IS WITH NO WARRINTEES. I HAVE ALL THE OTHER PARTS FROM THIS MOTOR SO ASK IF YOU NEED ANYTHING ELSE.

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