did my chain at 128 .
3 teethwere missing and cracks all over,I have a good pic of it its nylon on aluminum. when it starts to break down the nylon goes to the oil pickup and if it gets down to the aluminum the bearings can be damaged.
if the gear fails and the chain slips the pistons will hit valves
felpro timing cover set TCS45930
includes gaskets for timing cover /waterpump/cam sensor o-ring/fuelpump plate /front oil pan /rubber front seal/oilpump cover
your choice on the timing chain set, GM lasts and is quite but not cheap , stock replacement is cheap and youll need new tensioner-( gm Tensioner 25532546- gm Tensioner Spring 1358909, or try parts store ) , if going with a performance set no tensioner needed .
replace the cam button w/ HD cam thrust button roller type (GM 2553288)
or from dynagear(advance auto)cam button 7189
felpro rear main seal kit BS40613
felpro rubber oil pan gasket OS30521R or duttweiler cork
consider replacing the oil pickup tube (w/screen) advanceauto 2OIS2 -its cheap
good time to replace the waterpump and do the thermostat and check hoses and replace any worn
dont need to touch the oilpump
heres a link that has all the specifics for install
http://www.gnttype.org/techarea/engine/enginepage.html
the balancer is on good at over 200 ft lbs , you might have some fun getting it off but make sure to retorque to over 210ftlbs
a list of torque specs for all fasteners can be found here as well as how to install and adjust the cam and crank sensors.
http://www.vortexbuicks-etc.com/