Found a great deal on a low mileage L67 engine with transmission from a 95 SSEi, from what I read in the forum the transmission would not work with my PCM but could the engine swap without major issues?

For the most part. To have the most trouble free swap, you need to reuse your SC, TB, oil level sensor, knock sensor, crank sensor, harmonic balancer, EGR valve, ... I may be forgetting a few things at the moment.

But, yes, you can use the block and internals, complete heads, lower intake manifold, oil pan, exhaust manifolds and EGR pedestal, I think the timing cover, cam sensor, coolant temp sensors.

If you could tune with fuel pressure/PCM, you can use the SC and TB as a little upgrade.

Compared part numbers between model years on Advance parts website and cam and crank sensors are different. Knock, coolant, oil pressure, and ignition module were the same. I guess I'll go ahead and buy the motor and swap parts.

Noticed the MAF, and TP sensors are different part numbers so I'm guessing the PCM would need sigificant re-programming to accommodate the 95 SC/TB even if the fuel pressure was increased? I've used the TunerCat software to reprogram the PROM on my 3.4L DOHC Olds, but anyone know if this is possible on a 92 PCM with 95 SC/TB?

Bob..

I would review the FSM'*. If most of the wiring going inside is the same, swap over the engine/trans complete with wiring harness and swap PCM'* to a 95. This will take careful review of all engine control circuits and wiring though.

Swapping the PCM'* will be a major wiring undertaking. The PCM wiring harness is totally different.

Trust me. I have a 93 and a 95. Both L67'*.

And the fuel pressure runs LOWER on a 94/95 L67 than a 91-93. The fuel injectors are the same size, but the PCM manages them differently.

Your best starting point IF you are gonna use the newer SC and TB, is to use the newer MAF. And tune from there with fuel pressure or programming. The 95 will have two knock sensors in it, I think. You only need one and it will be in the rear.

I am currently looking for an engine to put in my 98 Se. My mechanic is going to perform the install. If I want to put in a Supercharged engine, does the PCM and the engine need to come from the same year car? Is this all that I need to get? Is there anything else I need to get off of the donor car I find?

Also, can i also use the engine from a Buick Park Avenue?

Update: Swap completed, ended up using the 92'* harmonic balancer, crank & cam sensors, SC and TB, exhaust manifold and EGR.

Two issues still unresolved. Vibration at idle - would the 92 harmonic balancer have different characteristics then the 95? Should I try to swapping the 95 balancer back on with it'* sensor or would the engine not run?

My second issue is what feels like knock retard after about one minute of operation. Runs really strong first minute, then feels like timing is pulled way back on anything more than 30 percent acceleration??? Would flaky PCM be the cause?

I don't think it will run with the 95 balancer. Interupter rungs are different. Timing could be pulled for a few reasons. Mainly Knock Retard if fueling is wrong. Maybe you have a temp related ignition issue. Can you get a real time data scan and look for KR or knock sensor counts? Did you use your 92 MAF and fuel pressure regulator?

If you swap the balancer (which is different than a 95 and will cause that vibration) then swap the crank sensor as well. Most likely the connectors are the same also.