Has anybody had any issues with a standard SLP 100225 underdrive pulley installation? GM mechanic is worried about the keyway being a passage for oil leakage. Should it be filled with sealant? Personally I donít see it being an issue since the seal is at the shaft, not at the pulley but it would be silly not to ask.
I've got no direct experience to share with you relating to the Vette underdrive pulley specifically, but I have been running the SLP underdrive pulley on my GMC Sierra's 5.3 LM7 (which is an LS base motor sharing many parts) for quite awhile now and no problems. No oil leakage that I can see.
I've actually been a little curious to see if the part numbers differ between the SLP I'm running on my truck and the part number for the vettes.
Also I've gotta ask, are you, or most other Vette owners who run the underdrive pulleys, also running an overdrive alternator pulley, or a more powerful alternator???
Unless it's a track/strip or dyno queen, I can't see running the vehicle like that long term and it doing any good for the system...
I upgraded to a 200amp alternator on my truck, but I also switched over to e-fans too, so it sounds a bit overkill, but I think it balanced out nice, running at just over 14 on the guage (however accurate that is).