Overview Reviews Product Description Big bore carb spacer for 4500 series carbs up to 2.500 throttle bore, 2" thick increases flow and signal to carb. Product Videos Product Reviews Write a Review Write a Review × 2.550 big bore carb spacer Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *