Overview Reviews Product Description Supertech SPRK-H1021D-ST Dual Valve Spring Kit for Honda F20/K20 Supertech SPRK-H1021D-ST Product Videos Custom Field Product Reviews Write a Review Write a Review × Supertech Supertech SPRK-H1021D-ST Dual Valve Spring Kit for Honda F20/K20 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *