These engines have been upgraded from the regular carbureted versions with the EZ-EFI^® Self Tuning Fuel Injection System by FAST! Most engines that use the Holley 4150 carburetor can be upgraded to the EZ-EFI fuel system! Call or email for details for your application.

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Chevrolet Small Block EZ-EFI®	Ford Small Block EZ-EFI®	Ford Big Block EZ-EFI®
Purchasing How to purchase a Tuff Dawg Engine product for your vehicle