I looked up that TSB/NHTSA item number (614146) at the NHTSA web site, and it refers to the Child Safety Seats.

Make: ISUZU
Model: VEHICROSS
Year: 1999
Type: ANY
Service Bulletin Number: SB0014S001
NHTSA Item Number: 614146
Summary Description:
AMERICAN ISUZU MOTORS INC. IS PLEASED TO ANNOUNCE THE AVAILABILITY OF TOP TETHER CHILD RESTRAINT SEAT ANCHOR BRACKET KITS FOR CERTAIN ISUZU SPORT UTILITY VEHICLES. THE USE OF THIS ANCHOR BRACKET MAY BE NECESSARY WHEN INSTALLING CERTAIN CHILD SEATS, WHICH REQUIRE ANCHORING TO THE VEHICLE WITH A TOP TETHER STRAP. *TT

This is actually the one I think you meant to direct me to:

Make: ISUZU
Model: VEHICROSS
Year: 1999
Type: ANY
Service Bulletin Number: IB00S005
NHTSA Item Number: 614139
Summary Description:
THIS INFORMATION BULLETIN OUTLINES THE PROPER STEPS TO INDEX THE CAMSHAFTS WITH THE CRANKSHAFT FOR VEHICLES EQUIPPED WITH DIRECT ATTACK DOHC 3.2L / 3.5L V6 ENGINE. IN THE EVENT THAT CAMSHAFT TIMING HAS BEEN DISRUPTED, DUE TO TIMING BELT BREAKAGE OR CAMSHAFTS / CRANKSHAFT BEING ROTATED WITHOUT A TIMING BELT, THIS IS IMPORTANT PRIOR TO TIMING BELT INSTALLATION. *TT

I'll pass this info on to the shop working on my VX and see if they can get the information. Worse case scenario I can shell out the cash to NHTSA and get it myself. Maybe this will solve my problem once and for all. Thanks Pyschos2!

Mbeach - Can you give me some more info about this valve damage you speak of? That seems odd to me too, as I've always heard that even a timing belt breaking at 60+ mph cannot cause damage to a non-interference motor.