Since the second electric LT1 smog pump has started to give me fits I figured I need a better solution. So I'm trying out an exhaust evac system. I would of liked to of welded it in at the merge between the two manifold outlets, but given the amount of oil this thing seems to pull I didn't want to risk fouling the O2 sensor, so I put it there. It definitely pulls a vacuum, but it doesn't seem like a very strong vacuum, but does "feel" similar to the electric smog pump, so it should be a break even deal at minimum for now. I may swap out the chambered Flowmaster muffler for a flow through type or glass pack.
To further pull oil out of the line, I've replaced the breather on my catch can with the evac intake.
Now I'm going to go swap out the front shocks and sway bar end link bushings. One of the front shocks has no bushing at all left in the lower mount.
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"How I learned to stop worrying and love the OHC Pontiac L6"
The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)
1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)