| Re: head casting# 10110810
"Vortec" is beginning to supplant "from a Vette" as the latest hot-rod rip-of buzzword.
You are correct in your suspicions about getting lied to and stolen from; those are NOT Vortecs. AFAIK they are swirlies. They've been around for QUITE A BIT longer than Vortecs; since the early 90s AFAIK. Vortecs appeared in 96.
The ONLY 2 Vortec casting numbers are 062 and 906.
Another great word to avoid is "bog". That's one of those ones that doesn't really have a specific meaning; people use it to talk about just about any condition where the motor seems to run worse than it did a second or 2 before. You'd probably be able to get more hwlp if you can describe EXACTLY what the motor did.
The typical effect of swirlies on an otherwise strong-running motor, is the "tractor motor" effect. You get this great grunt off the line, sems like it takes off pretty good, but by the time it gets to the top of 1st gear, it has quit accelerating. Then it kind of hangs in gear, and eventually shifts; takes off good again, and kind of hangs when it gets to the top of second. It's caused by poor flow, which doesn't matter so much when the RPM is low, because the cyls have plenty of time to draw in their charge past the obstruction, and it can even work to a benefit. But then when the RPM gets too high, no further flow occurs, therefore no additional power is created, therefore it stops accelerating. Kind of like your typical LG4 car or something where you go to pass somebody and it kicks down into 2nd gear but goes exactly NOWHERE.
If that's how your car runs, then yeah, those heads could easily be the culprit.
I'm sorry to see that there's dishonest people out there trying to take advantage of the uninformed, and that you got vicitmized. Not much to do now except to write it off as an installment of the dumba$$ tax, and move on. If I could have back every payment of that tax that I'VE made, I'd be a wealthy person I'm sure!!!
__________________
Numquam ponenda est pluralitas sine necessitate.
— William of Ockham, from Quaestiones et decisiones in quattuor libros Sententiarum Petri Lombardi
Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:
The simplest explanation that fits all the facts is probably the right one. | 
