Will 4.3 upgraded injectors swap into 5.7 injector housing

Will 4.3 upgraded injectors swap into 5.7 injector housing

Postby timothy47130 [OP] » June 6th 2017, 4:02pm

As you know I am planing a 5.7 swap this month. The 5.7 I bought still has the poppet injectors. A month before my 4.3 went out I did the switch to the upgraded mini multi port injectors. I did some cross referencing and it looks like the 5.7 and the 4.3 use the same injectors. So can I use the 5.7 fuel distributor housing and install the 4.3 mini injectors in it? Of course I know I would be 2 injectors short , But purchasing 2 injectors is a lot less than buying the whole thing. This is a budget build and I need to save where I can. I hate the thought of having to run the poppet injectors untill I can afford the upgraded injector assembly. The 5.7 I got is badly carboned up from the old poppet injectors. Thanks
1998 chevy astro mark III conversion with 125,000 miles

all stock besides-
dual exhaust
rear lifted 1" with s-10 leafs
10,000 lb capacity transmission cooler
corvette 2nd gear servo
Trans-go SK4L60E shift kit

5.7 Vortec swap on the way
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Extra Info: mark III conversion

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Re: Will 4.3 upgraded injectors swap into 5.7 injector housi

Postby icebrrg3rd » June 6th 2017, 7:47pm

I know it's different for a TBI because the 2 injectors are feeding 8 cylinder instead of 6, but with yours, each cylinder gets an injector all to itself, and the cylinders IIRC are identical in bore & stroke between the 4.3L & 5.7L, so I would tend to agree with your logic that the poppet injectors from a 4.3L will work on a 5.7L (with 2 more, of course).

Of course, I'm not a qualified mechanic, hopefully someone more knowledgeable will pipe in soon whether or not that's true.

Good luck with the budget build.

-Andrew
81 Yamaha Maxim 650XJ 650cc 68k mi
91 Chevy Astro 5L 5-speed, Ford 9" 261k mi
02 Yamaha Road Star 1600cc 27k mi
02 Chrysler Sebring Conv. 2.7L 5-speed 213k mi
10 Chrysler Town & Country 3.8L 180k mi

To her it's all dollars and no sense--Wimpazz
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Re: Will 4.3 upgraded injectors swap into 5.7 injector housi

Postby AstroWill » June 6th 2017, 7:52pm

No, you will have to buy the entire spider assembly.

Trolls take away from productive work, best to starve the troll of attention by ignoring it and going about your business.
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Re: Will 4.3 upgraded injectors swap into 5.7 injector housi

Postby timothy47130 [OP] » June 6th 2017, 8:28pm

You sir are right. I just read the TSB on the injectors and it states do not swap injector types. The bracket that holds them in the housing is different. Guess I will be cleaning the old poppet injectors for now. I will never find a 5.7 upgraded injector assembly at the junkyards around here for a decent price. They want almost new price for one.
1998 chevy astro mark III conversion with 125,000 miles

all stock besides-
dual exhaust
rear lifted 1" with s-10 leafs
10,000 lb capacity transmission cooler
corvette 2nd gear servo
Trans-go SK4L60E shift kit

5.7 Vortec swap on the way
Original Poster [OP]
timothy47130
Firing on 5 Cylinders (L1)
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Years of Membership: timothy47130 has been a member for 5 full yearstimothy47130 has been a member for 5 full yearstimothy47130 has been a member for 5 full yearstimothy47130 has been a member for 5 full yearstimothy47130 has been a member for 5 full years
Posts: 593
Topics: 41
Images: 7
Joined: March 2015
Location: southern indiana
Gender: Male
Alias (AKA): Tim
Van Model Year: 1998
Van Make/Model: Chevrolet Astro
Extra Info: mark III conversion

Re: Will 4.3 upgraded injectors swap into 5.7 injector housi

Postby icebrrg3rd » June 6th 2017, 10:28pm

Sorry about that, glad someone in-the-know responded with a correct answer, altho not the one you wanted.

-Andrew
81 Yamaha Maxim 650XJ 650cc 68k mi
91 Chevy Astro 5L 5-speed, Ford 9" 261k mi
02 Yamaha Road Star 1600cc 27k mi
02 Chrysler Sebring Conv. 2.7L 5-speed 213k mi
10 Chrysler Town & Country 3.8L 180k mi

To her it's all dollars and no sense--Wimpazz
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