Easiest V8 Swap Question (Probably)

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Easiest V8 Swap Question (Probably)

Postby ZsV8Jimmy » Tue Jul 18, 2017 9:31 am

Ever since my former build got hauled away and hasn't been touched since, I've been focusing on life and other stuff before even thinking about touching my build. I've recently re-purchased one of my former vehicles, my 1996 GMC Jimmy SLE. It was my daily until I purchased my 2017 Mazda 3. Since that's my daily now, I've been toying with the idea of just throwing some junkyard 305 into the Jimmy and using it as a not so serious project. It's a 2WD if that info helps.

Basically my question is what's the bare minimum to get the V8 swap "working"? I'm buying a dirt cheap TBI 305 that I'm converting to carb since 350's are going for gold near me and online right now and 5.3/6.0 LS motors ain't too far behind. I'm not looking to spend a ton of money, just enough to get the V8 Jimmy going. The 4.3 in it has over 230k miles and drinks oil like no one's business. So far from what I can tell I need to do the following:

- 305 Motor (Purchasing soon)
- TH350 Transmission (Have it at home)
- 2.8 frame mounts with 350 engine mounts (S10V8 seems like a decent site to get that)
- 2WD Shorty Headers
- Taurus e-fans
- Recess the radiator into the frame and ditch the AC compressor (AC hasn't worked in years anyways and this won't be a daily)
- Reuse my 4.3 accessories bolted on to the front of the 305 (new water pump due to reverse rotation on the 4.3)
- Custom driveshaft (I've gotten mixed answers on this. With the 4.3/4L60E I've been told a 305/TH350 would require a custom driveshaft. Not a big deal though)
- Fuel Pressure Regulator installed between the stock fuel lines and the carb itself
- New TH350 Trans Crossmember (More mixed answers, some say the TH350 will sit in place of the 4L60E with little fabrication)
- Distributor/General power wiring
- Ford 8.8 Rear End (Later down the road once my current rear end goes out)

I know "search is your best friend" which I did a ton of way back when I was gearing up for this great 4x4 build. Problem is that was quite a few months ago and at this point I'd just rather know what I'm missing from this list to get it running. Once it's running I'll focus on buttoning up the rest of it down the road.
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Re: Easiest V8 Swap Question (Probably)

Postby lowblazin94 » Tue Jul 18, 2017 10:00 am

Do not use the 2.8 mounts.

Better off with manifolds than shorty headers

The 4.3 crossmember will work, what tail shaft is on the th350 now?
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Re: Easiest V8 Swap Question (Probably)

Postby ZsV8Jimmy » Tue Jul 18, 2017 10:19 am

Forgot to mention a Corvette Fuel Filter for a fuel return line to the fuel pump.

Not too sure the tailshaft length, I know it came out of a TH350 but I haven't measured it. I'll swing by my storage today and check it.

F-body manifolds are the ones you're talking about, right? Some of this is jogging my memory lol.

I was unaware there was another option for mounts. I was under the impression that the only way to get the motor sat in there aside from completely custom mounts was to swap to 2.8 mounts and go that way.
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Re: Easiest V8 Swap Question (Probably)

Postby lowblazin94 » Tue Jul 18, 2017 10:38 am

No theres the sticky on motor mounts
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Re: Easiest V8 Swap Question (Probably)

Postby ZsV8Jimmy » Tue Jul 18, 2017 10:45 am

I'm probably just blind here but I'm not seeing any stickies. Just announcements and new posts across the entire forum board. Maybe a bug on my end?
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Re: Easiest V8 Swap Question (Probably)

Postby ZsV8Jimmy » Tue Jul 18, 2017 11:52 am

I found the sticky in question (I was blind lol), and from what I could gather after skimming the first few pages while at work I see that the only mounts that are really suggested are custom made mounts. I'd rather not go that route if at all possible, so I'll probably stick with the 2.8 mount setup anyways. However I did find a set of 1995 Camaro manifolds that I've read work just fine with the 305/350 setup. So I'm probably gonna go that route. Thanks for the info!
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Re: Easiest V8 Swap Question (Probably)

Postby Rickracer » Tue Jul 18, 2017 4:36 pm

The "custom made mounts" are just copies of the Trans-Dapt 4689 mount adapters, (you can either buy them or make them, your choice), and trust us, they are the best way to go unless you're running shorty headers,which I wouldn't recommend anyway. 8)
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Re: Easiest V8 Swap Question (Probably)

Postby Dusterdude » Tue Jul 18, 2017 4:46 pm

Arent the 4.3 mounts the same as a v8?

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Re: Easiest V8 Swap Question (Probably)

Postby ZsV8Jimmy » Wed Jul 19, 2017 6:26 am

Yeah I've read a ton about the manifold vs. shorty debate. Doesn't really seem like much of an increase in power if you get the right set of manifolds. And this swap isn't really gonna be about amazing power. Just something to have on the side to play with really. :P

But thanks for everyone's advice. I'll probably just end up picking up the Trans-Dapt Adapters so I don't have to get them made and will have somewhere to return them if it doesn't work out.
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