This is the 4-hole adapter preferred over the open plenum models as it keeps the carb bores directly in line with the manifold bores so there is no mixing between the primary and the secondaries disturbing the air/fuel mixture control. This model increases performance and mileage greatly over the open plenum, models, PLUS ONCE AGAIN WE HAVE THE BEST PRICE IN THE WORLD!
Manufacturer: Spectre Performance Products
MPN: 5775
SKU: 7256