Forgot to mention, I started out this spring by getting a similar problem in my car...it ended up being a blown head gasket between cylinders 4 and 6. Didnt lose any coolant it was just between the cylinders. I even posted a topic that is eerily similarly titles to yours:
http://forums.maxperformanceinc.com/...d.php?t=695593
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1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi.
Everything installed, fired up and tuning has begun!
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