87 S10 4X4 Blazer - 2.8L Engine Rebuild or Swap - S-10 Forum
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post #1 of 6 Old 12-06-2015, 02:26 PM Thread Starter
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Post 87 S10 4X4 Blazer - 2.8L Engine Rebuild or Swap

My beloved Blazer has a blown head gasket, possible cylinder damage, has been hot a few times and has high mileage 225K.

Looking for advice from an experienced enthusiast in rebuilding the motor.

Should I get a crate motor or a remanufactured motor?
Is there a bigger motor or stroker available? 3.1L or 3.4L?
Considering headers and a performance chip.
The manual tranny and 4WD both work great and are in good shape.
The 4.3L sounded like a good idea until I saw that on the 87 might need to swap the tranny and other parts.

Just trying to define the direction right now and would appreciate some feedback. ~Kelly

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post #2 of 6 Old 12-06-2015, 02:47 PM
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Re: 87 S10 4X4 Blazer - 2.8L Engine Rebuild or Swap

To swap to a 4.3 requires swapping the trans on all years, not just 1987 when the original engine is anything other than a 4.3 in an S-series.

Yes, a 3.1 or 3.4 from F-bodies can be swapped in place of your 2.8L, to make it easy use your induction, oil pan and exhaust manifolds. You will also need to swap the water pump to retain the mechanical fan.

You also have the option right now since it sounds like the truck is not driveable in it's current condition, to pull the engine and tear it down for an inspection and possible rebuild. If the major mechanicals look to be in good shape, then freshening with new bearings and gaskets might be a good option. You could also swap out the crank and pistons to stroke it to a 3.1 if you did this.

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post #3 of 6 Old 12-07-2015, 04:08 PM
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Re: 87 S10 4X4 Blazer - 2.8L Engine Rebuild or Swap

Raven has good suggestions...

Probably the fastest and least expensive is to find a good used 3.1 or 3.4 (3.4 out of a 93 - 95 Camaro/Firebird preferable) and install that. It will give you more power and is a pretty direct drop in.
There are a few small differences, but they are easy to handle.
If you do get to do this swap, continue this thread.
There are many who have done this and will be glad to offer support.

Edit... a good used block is called "Seasoned".
An over heated block = over seasoned...

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2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #4 of 6 Old 12-08-2015, 12:07 PM
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Re: 87 S10 4X4 Blazer - 2.8L Engine Rebuild or Swap

Sure will. Swap to 3.4 is pretty easy. It's all bolt in.

Sorry I've been away guys. Those fudgepackers at work blocked the site!

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EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

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post #5 of 6 Old 12-26-2015, 09:05 PM
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Re: 87 S10 4X4 Blazer - 2.8L Engine Rebuild or Swap

Look on car-part.com for decent mileage 3.4 from a 94-96 camaro or firebird or pick a super high mileage piece and rebuild it - better to spend the money on machining and balancing a 3.4 instead - you jump from around 125 hp to 160ish - not emissions legal so don't tell the smog check guy it has a 3.4 instead of a 2.8 - if you get the fuel pressure regulator adjustability kit you can tailor the amount of fuel released from the injectors to fatten up just enough to compensate for the larger volume of 0.6 liters
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post #6 of 6 Old 12-27-2015, 05:26 PM
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Not sure where you are from but I have a 2.8 and auto trans ready to drop in with 69,000 original miles that runs great. I'm doing a v8 swap on the truck. I was going to keep the truck original at one point and put some money in the motor . Now it's in my way so I would sell cheap
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