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Old 2010-02-03, 17:03   #1
Jamie Miles
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Chevy TBI?

Lets say "theoretically" I have an '89 Chevy truck, and the TBI 350 in it spun a rod bearing today and it's now got a very bad knock in the bottom end. Well, I just happen to have this nice 351w sitting around, and as it turns out, there are SBF to Chevy bell housing adapter plates available, and adapter plates available to mount the Chevy TBI setup on a number of intake configurations... and by my measurements, if I put a set of frame mounts on the truck for a 4.3 V6, and use 80's crown vic rubber mounts on the engine, it would be very close to bolting in.... Why wouldn't the Chevy throttle body fuel injection run the 351w?

I drove the truck to work today and it spun a bearing on the way there. To it's credit, it made it 10 more miles to work with the rod knocking bad, and then made it 35 miles home this afternoon, and it still hasn't spit the rod out. I've had this idea of dropping a 351 in it since the day I got it, and now I've got a reason to try it..
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Old 2010-02-03, 17:08   #2
mean_maverick
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should be that hard as long as your other sensors will plug/screw into the intake.... or find an '85 Vic with a 302 and rob the stuff off of it. (most '85 models have a TBI setup, i have one in the basement)
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Old 2010-02-03, 17:14   #3
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the biggest issue will be to make it work with the ford dist. I do believe
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Old 2010-02-03, 18:01   #4
Jamie Miles
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Aren't many sensors on it, but I'm sure what's there could be swapped onto about any engine pretty easy. It's a very basic setup. I'll have to look into the distributor. Could always just leave the carb on it as well.
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Old 2010-02-03, 18:35   #5
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the biggest issue will be to make it work with the ford dist. I do believe
Can solve that with an HEI conversion.


Jamie, you should do this. And when you do, please thoroughly document what you did to make the TBI work. This could end up being a very economical and clean way to get EFI in a Maverick, as there would no longer be the clearance problems typical of 5.0 EFI, it would look somewhat carb-ish, and the GM TBI isn't totally unsupported by the aftermarket, unlike that one-year bastard Ford TBI...

Plus, for those few folks that look at my HEI distributor with digust when I open my hood, I could really piss 'em off with this!
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Old 2010-02-03, 20:14   #6
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Can solve that with an HEI conversion.


Jamie, you should do this. And when you do, please thoroughly document what you did to make the TBI work. This could end up being a very economical and clean way to get EFI in a Maverick, as there would no longer be the clearance problems typical of 5.0 EFI, it would look somewhat carb-ish, and the GM TBI isn't totally unsupported by the aftermarket, unlike that one-year bastard Ford TBI...

Plus, for those few folks that look at my HEI distributor with digust when I open my hood, I could really piss 'em off with this!
The EFI style HEI is without the coil in the cap has no internal or external advance it is computer controlled.

My concern was with with the firing orders being differant may be what presents the problem considering the distributor reluctor wheel will have differant spacings between the chevy and ford.

Holley may have some solution as the 2brl TBi kits are GM based
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Old 2010-02-03, 20:21   #7
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You would have to have a new eprom chip made, they have been doing this to AMC motors for years so it is nothing new. The problem with just sticking it on is the 350 has a different air/fuel ratio requirement and if you just stuff it on a different motor you can either lean the motor out or blow black smoke all day.
A buddy of mine did that same thing with his 454 thinking it would give him better fuel economy over his carb, turned his burban into a smoking dog... heck the guys in the 4 banger dodge minivans were pickin on him..

here is a good place to start looking for chips if you are going to go that route
http://tbichips.com/
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Old 2010-02-03, 20:50   #8
Jamie Miles
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Quote:
Originally Posted by facelessnumber View Post
Jamie, you should do this. And when you do, please thoroughly document what you did to make the TBI work. This could end up being a very economical and clean way to get EFI in a Maverick, as there would no longer be the clearance problems typical of 5.0 EFI, it would look somewhat carb-ish, and the GM TBI isn't totally unsupported by the aftermarket, unlike that one-year bastard Ford TBI...

Plus, for those few folks that look at my HEI distributor with digust when I open my hood, I could really piss 'em off with this!
Just use a Chevy TBI and run with it with a megasquirt. I could do the same in my case, but just thought maybe I could get around it.
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Last edited by Jamie Miles; 2010-02-03 at 21:07.
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Old 2010-02-03, 23:18   #9
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Also the Chevy TBI really does not care what distributor you use, all it is for the most part is just an electronic carburetor.




This is the howell TBI kit for an AMC V8 it shows everything that you would need to make a TBI unit run some of it you would not need if you were leaving it in the truck. Those motors also used a duraspark distributor. So unless you have a EFI distributor you should be fine to run the current one you have.
http://www.howellefi.com/customer/pr...cat=280&page=1
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Old 2010-02-03, 23:54   #10
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Quote:
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The EFI style HEI is without the coil in the cap has no internal or external advance it is computer controlled.
I'm not sure you couldn't run the Ford distributor, but... Not all HEI's are coil-in-cap, some of them are "divorced" from the coil and use a smaller body. I know these are available for the 302, not sure about the 351. This, I think, is what the TBI (and TPI) distributors are based on, and I wonder if the guts would swap over.

Either way, I would think some sort of hybrid distributor could be made using the TBI one and a cheap Ebay HEI conversion distributor. Wouldn't be a very expensive experiment anyway...
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