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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old July 3rd, 2017, 04:56 AM
HOTRODJOHN HOTRODJOHN is offline
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Default Looking for a magnum manifold

I am going to put an EFI unit on my 64 and am looking for a 1966 Magnum Manifold to convert to a 4BBL and use an aftermarket EFI fuel injection unit. I will be doing a follow along on this project. Thanks, John
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Old July 3rd, 2017, 06:52 AM
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Default Re: ,ooking for a magnum manifold

Quote:
Originally Posted by HOTRODJOHN View Post
I am going to put an EFI unit on my 64 and am looking for a 1966 Magnum Manifold to convert to a 4BBL and use an aftermarket EFI fuel injection unit. I will be doing a follow along on this project. Thanks, John
To take full advantage of the magnum intake manifold, John, you really need the magnum heads and magnum exhaust manifolds to go along with it. They all have larger ports than the non-magnum components.

We'd love to follow along on your EFI project! Good luck with it.
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Old July 3rd, 2017, 03:04 PM
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Default Re: ,ooking for a magnum manifold

You going with the Holley Fi tech?

What size engine?
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Old July 4th, 2017, 01:14 AM
HOTRODJOHN HOTRODJOHN is offline
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Default Re: ,ooking for a magnum manifold

I am going to use a FiTech unit. I became a dealer for them and have installed several units and they are very simple to install and get running.I really need to get a manifold now. John
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Old July 4th, 2017, 02:29 AM
bigblockv6 bigblockv6 is online now
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Default Re: Looking for a magnum manifold

John, when you get the injection going let us all know how it works out, I will most likely be interested in a FiTech for my 478. Which unit would you recommend for my 478 which presently has ported and polished heads and a performance grind cam
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Old July 4th, 2017, 02:39 AM
HOTRODJOHN HOTRODJOHN is offline
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Default Re: Looking for a magnum manifold

The one we would use is the go street style. You feed in your information into the programmer start it up and let it idle for a while and then drive it for about 40 miles to set the computer and your done, You do need to have about 40 to 55 lbs of fuel pressure and that's it. If you know anyone who has a manifold please let me know. Also, what type of cam did you use and did it make a big difference. Rhanks
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Old July 4th, 2017, 05:24 AM
bigblockv6 bigblockv6 is online now
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Default Re: Looking for a magnum manifold

The cam is a custom grind specific for the larger cubic inch V6 engines with bigger heads. As far as difference the 478M was fully rebuilt with the cam and I used it to replace the 305E in my 68 pickup, it should have a considerable power increase over a stock 478M. If I can dig up the cam specs from my computer files I will send them to you.
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Old July 4th, 2017, 04:58 PM
HOTRODJOHN HOTRODJOHN is offline
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Default Re: Looking for a magnum manifold

Thanks I appreciate it, do you know the approx. horsepower now. Also, do you know who re-ground the cam.
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Old July 4th, 2017, 05:55 PM
bigblockv6 bigblockv6 is online now
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Default Re: Looking for a magnum manifold

The Cam was ground by a local cam grinder in Hayward California who is no longer in business, I have the specs so you can have just about any cam grinder do it for you. There are several other members I've given the specs to that are running this grind in their bigger V6 engines.
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Old July 6th, 2017, 10:30 PM
atomman atomman is offline
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Default Re: Looking for a magnum manifold

As an FYI, I had 3 cams ground for the V-12's by Oregon Cam Grinding, http://www.oregoncamshaft.com/. Does superior work. Infact, found a 702 cam on the shelf there.
Atomman
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