Yeah it could be the pump.
But as far as taking the heads off. I just went through that whole ordeal because I thought I had a bad lifter or worse. I stripped down the whole topend and bought new GM MLS head gaskets and new GM bolts. It wasnt that bad of a job, I did it all myself with hand tools none the less. As long as you follow the correct tq patterns for the heads and rockers you should be just fine.
This is with the passenger side head off. I did do the other side too.
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2000 SS Th350, FTI 4200 stall , cam, full bolt-ons, 150 wetshot, Moser 9inch/locker/4.11s, Slowhawk tuned. 493rwhp 570rwtq. 10.97 @ 127.7 1.58 60' and M6
10.84 @ 126.3 1.55 60' Th350 SOLD BUT NOT FORGOTTEN
New Toy - 06 Torrid Red Gto M6. 231/242 cam, Kooks, magnaflow, GForce, Monster stg2, lingenfelter cai, 411rwhp 385rwtq. 12.40@111
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