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Super charged/non-super charged question

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ohgreatone32

New member
I recently purchased a '98 GTP. It had just had the engine replaced with a used one, which I knew about, but the car was priced accordingly. On the way home the engine developed a rod knock. The dealer is installing another used engine. He's covering the cost of the parts, I'm paying for the labor. I just got off the phone with him. He said they're having to change the alternator bracket and some other unspecified things that are different.
I have a few questions.

Were different alternator brackets used on different years of super charged engines, or is he trying to put a non super charged engine in the car?

If in fact the engine he's putting in was a normally aspirated, what kind of eng/trans reliability can I expect to have since it will have a blower on it?

Is there an easy way to identify a normally aspirated short block once the intake and blower have been installed?

Thanks in advance for any info you can provide!

~Darrel
 


Im not sure how best to answer your other questions, but I do know that different alternator brackets were used. Now what years that covers Im not sure since I have not had to deal with that.
 
It's also possible the new L67 shortblock is from a Bonneville SSEi, Park Avenue Ultra, or even an Olds 88 LSS or L67 Riviera, any of which would require some changes to bracketry and such. Ask and see just what the donor make/model/year/trimline is.

The only relatively easy way I can imagine to visually positively ID a shortblock as having L36 or L67 internals--after installation in the car anyway--is to pull the oil pan and inspect the connecting rods from underneath. The rods on L36 vs L67 are different, in that L67 are shorter and thicker. I do not have side-by-side photos, but I'll bet someone else here does.

Almost forgot, an L36 (n/a) bottom end with a blower slapped on it will chip a piston fast if not modded/tuned for it, because the n/a bottom end has higher compression than the s/c bottom end (due to differences in the piston dish). An L36 bottom end is not a suitable direct stock replacement for an L67 bottom end (or vice-versa).
 
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The blower and manifold won't go onto a NA engine, the heads are different.

97s and early 98 models did have different alternator brackets, as well as the tensioner/heater hose setup that sits under the alternator. Also other types of cars will have different accessory setups. Regals differ from GP's and Bonnevilles, etc.

For the most part, the engines are the same on the L67 side except for some differences in heads.
 
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