![]() SFI is somewhat more efficient at idle and low engine speeds. Sequential Multi-Port, Satin, 550 HP Max, 1965 and Later BB Chevy Large Oval Port, Kit. The injectors are timed to fire at the beginning of the intake stroke, with each cylinder fired individually. Find CHEVROLET 7.4L/454 Chevy big block Gen VI Fuel Injection Systems and get Free Shipping on Orders Over 109 at Summit Racing Its the Season for Savings - Shop Holiday Offers Now. The second benefit is that you’ll have to refill the. First, you’re spending less money on gas a big deal for Pros that rely on a generator day in and day out. It’s not uncommon to see claims of 25 improvement here. ![]() Still the most common form of electronic fuel injection on production vehicles, the GM V-8s we know and love have. Electronic fuel injection improves your engine’s fuel efficiency. Trending Questions What kind of information is available at the website Partnership Card? What happens if you hit someone with your car? We have trees on our property that the limbs are growing onto the neighbor's roof. SFI or SEFI means sequential (electronic) fuel injection. Port Fuel Injection (PFI): Also known as Multi-Port Fuel Injection (MPFI or MPI).
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