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Mike S.
Mike S., Chevy Mechanic
Category: Chevy
Satisfied Customers: 7368
Experience:  ASE Certified Master Technician
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I have a 454 vortec that's will 350 vortec fit my truck,

Customer Question

I have a 454 vortec that's blown will 350 vortec fit my truck
JA: What year is your Fit?
Customer: 1998
JA: Are you fixing your Fit yourself? What have you tried so far?
Customer: Yes fixing it myself. Took motor put block is cracked
JA: How many miles are on the car? Is it an automatic or a manual transmission?
Customer: Automatic 189000
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 10 months ago.
Category: Chevy
Expert:  Mike S. replied 10 months ago.

fit as in how?

Customer: replied 10 months ago.
To the wiring harness
Expert:  Mike S. replied 10 months ago.

It's possible it might, normally they manufacture the same wiring harness for all the different size engines that go into a specific year, make, model so it makes it easier. Speaking of year, make and model, you never did mention what model. All you said was truck, is it a C or K and 1500, 2500 or 3500?

Customer: replied 10 months ago.
K3500, 1ton dually 4l60 tran
Expert:  Mike S. replied 10 months ago.

Yes, they are the same harness.

here is what I found, a engine wiring harness part #12175830, for the 7.4 here

engines, it list ENG: ENGINE,4.3L(4.3W),CPI,V6,90 DEG 4.3W(L35); ENGINE,6.5L(6.5F),DIESEL,TURBO HIGH OUTPUT 6.5F(L65); ENGINE,DIESEL,8 CYL,6.5(6.5S)TURBO 6.5S(L56); ENGINE,GAS,8 CYL,5.0L,CPI 5.0M(L30); ENGINE,GAS,8 CYL,5.7L,CPI 5.7R(L31); ENGINE,GAS,8 CYL,7.4L,MFI 7.4J(L29)

Customer: replied 10 months ago.
I didn't think the plug for fuel injection were the same I liked at a 97 5.7L and looked different from mine
Expert:  Mike S. replied 10 months ago.

Fuel injection what? There are plenty of plugs on a fuel injection system.

Plus, you never mentioned if these engine had mfi, sfi or what.

Plus, why are you looking at 1997?

Expert:  Mike S. replied 10 months ago.

is that it? You stop responding to me.

id that answer your question? If so, kindly leave me a positive rating, so I get credit.

Customer: replied 10 months ago.
It's the square headlight look, not the newer body style, direct injected is the 454
Customer: replied 10 months ago.
The main plug for the fuel injection sits right behind the throttle body on 350 motor
Expert:  Mike S. replied 10 months ago.

Yeah, that is about all the information I have. It would take many more hours probably to find an answer but I would be googling it, which I am sure you have already done. I will opt out.