Billet ITB Adapter for the Big Port 16V 4AG. This ITB adapter will allow you to bolt the individual throttles from the 20V 4AG directly to your Big Port 16V head.

This adapter is specifically designed for the Silvertop 20V throttles, but the blacktop throttles will bolt up as well. The blacktop throttles have an odd diamond shape on the back side of the throttle, so you will need to spend a few minutes port matching our adapter with a dremel if you want to run the blacktop throttles.

You will need a standalone ECU or such in order to convet your 16V to open throttles.

Be sure to check out our velocity stacks, splashguard, and filters as well

  • Machined from a solid hunk of 6061
  • Vacuum nipples on each runner for easier tuning
  • Perfectly port matched for best flow
  • Angled upward for better looks and flow
  • Fits Big Port 4AG 16V cylinder head only