K&B venturi for the 4011
If you use NVA 87-2918 the sides of the flange on the front housing must be milled down slightly
If you use our new universal NVA 987-001 no modification is needed.

Neck o-ring not included.

Diameters: Neck is 0.530", throat 0.290

This fits the MECOA .46 C/L engines with our universal needle/spray bar 987-001 and 2 neck o-rings. Links below.