My Blazer coughed . . . and spit this out. I've been kicking around getting the Blazer running - I bought it a couple years ago and it has set on the back burner. When I initially tried to get it running it gushed oil from the rear main seal and had not been driven for probably 9 years. I decided rather than replace the rear main seal with the motor installed, I would yank it and have the motor gone through - I'm pretty sure a rebuild is in order. Went out last night at 9:00 pm and hit the shower at 12:30 a.m. Hopefully get it to an engine guy on Saturday to see what kind of shape it is in. This is a 400 sb and that is all I know about it.