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Old 05-27-2002, 06:49 PM
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Question Holley fuel injection with Vortec heads onna SBC.

OK kids, I need some help here...

I was given a Gen 1 Vortec crate motor, the rods and pistons are missing, I have everything else. The block uses a one piece rear seal and roller cam.

I also have a Holley "Tower of Power" MPI injection manifold, Part #9901-110 + the control boxes for the injection and distributor.

I don't know anything about this injection/intake and would like to hear from someone who has used it.

Here's where you can help me out.
I wanna build a daily driven engine that can get good fuel mileage and still feel frisky.

I can stick the Vortec heads on a 350, a 327 or a 305. I got my own opinions, horsepower-vs-fuel mpg, but I want to hear yours.

This one is for my Honey's car ('73 Jag XJ6) and she still likes to put her foot down sometimes.
I will probably be running an OD trans behind it, 'cause Honey don't shift.


Whaddya think?
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Old 05-27-2002, 07:56 PM
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[ May 27, 2002: Message edited by: blown69stang ]</p>
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Old 05-27-2002, 07:58 PM
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I don't have one of these units but I do know that you won't experience improved fuel economy from just injection. Maybe 1 mpg. You experience most of economy from improved combustion, timing control, and quicker throttle response. The improved timing and combustion means that you don't have to have the unit rich like the carbs are. Carbs are set at 17.1:1 fuel to air ratio as apposed to the optitmal 14.7:1 ratio that injection attempts to keep. Hopefully this is a closed loop system (more expensive and has more sensors). These are the best systems to have. I have a website to give you at the bottom to read a faq with many answers to what you want to hear. There is no question that she will enjoy the improved response and better fuel economy that FI will give. And you can have you performance too. The injectors are changable for your specific power range. Don't go overboard on the injector because just like a carb, bigger is not always better. For something about 250-300 hp and not going to be raced, then use about 24lb. per hour injectors. Call Holley to find what the best injectors for you system will be. Good luck.

Look up Afordable Fuel Injection (AFI) for the faq. I can't find the url but I have that faq in front of me.
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Old 06-06-2002, 11:17 AM
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WHY NOT USE THE HEADS ON YOUR MOTOR&gt;
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