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Old 11-02-2007, 12:04 PM   #1
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Default Engine Replacement

Just bought a 95 Bonneville SSEI. The engine doesn't work, but supercharge is okay. Could I replace engine with plain 3800 V6 and transfer supercharge? or do I have to get a supercharged engine? What years are good for this car?

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Old 11-02-2007, 12:12 PM   #2
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Being a 95 supercharged, it will share the same motor with only 94 and 95 series 1 supercharged. The swapping that you might hear of happening is on the series 2 non supercharged motors and while it'* been done....it'* not the recommended way for a daily driver.
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Old 11-02-2007, 12:14 PM   #3
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Quote:
Originally Posted by BillBoost37
Being a 95 supercharged, it will share the same motor with only 94 and 95 series 1 supercharged. The swapping that you might hear of happening is on the series 2 non supercharged motors and while it'* been done....it'* not the recommended way for a daily driver.
This information is a bit off.

The bottom end of the motor (block, crank, pistons, rods, etc) are identical from 91-95 on the L67 (supercharged) motors. You can use any of those years. You will want to RETAIN your original crank sensor and harmonic balancer if you get an engine from one of those other years.

91-93 Superchargers and throttle bodies are different, but your replacement MOTOR can be any of those SUPERCHARGED donors.

The bottom end of the L27 wasn't designed for boost. Don't attempt the 'top swap' if you expect it to perform like the original, or to last.
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Old 11-02-2007, 12:26 PM   #4
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Lets simplify the whole world here...

Look for a Series 1 1994-1995 Vin # 1.... Get the engine complete.... The chances of finding a good 91-93 are few and far between.... Even 94-95 is getting harder to find in some areas..

Toss the notion of using the L27 NA Bottom end..

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Old 11-02-2007, 12:28 PM   #5
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I'd have to disagree to a certain level.

I'm currently searching for a replacment bottom end. I've found many 92/93 engines with great compression and around 100k miles.

The point of my reply was to correct an mis-statement by billboost37 that only the 94/95 engines were compatible.
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Old 11-02-2007, 12:33 PM   #6
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I disagree with it being called a bit off

The motor as mentioned implies long block. Your correction is to mention that the short block is compatible. The only information we have is that the engine does not work.

An assumption that the heads can be reused on a new short block may cost the OP more in the long run.
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Old 11-02-2007, 12:35 PM   #7
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You stated that 94/95 were the only years that would work on his car. Other than the supercharger, which he stated he already has in good condition.

Considering that, there are no issues. 91-95 engines are compatible with each other. With the exception of the minor bolt-on parts I stated above.
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Old 11-02-2007, 12:36 PM   #8
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A 91-93 long block could be used, but the valve train will have different parts. It'll still work, however.
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Old 11-02-2007, 12:39 PM   #9
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I will still recommend the 94-95 Vin#1.... If he can find a 91-93 and wants to swap the heads over from the 95 block to have the rollers or the ability to go to roller rockers then he can do that..

I recommend a 94-95 Vin #1,

But Yes any 1991-1995 Vin#1 will work fine in his application

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Old 11-02-2007, 12:39 PM   #10
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Exactly. And there isn't even 5hp in the valvetrain. Aside from that, the valvetrain from the 95 could simply be moved over. I don't recall ever seeing a failed pushrod or lifter. Valves, springs, and retainers are all identical. Heads are identical from 93-95. 91/92 heads are compatible with their valvetrains.

As you can see, there are many options, and it doesn't really matter what year of donor motor you get as long as it'* a Supercharged motor to begin with.
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