Yes you should have had it honed at least. Boring to insure roundness was another good idea read here.
I like the Stock type piston, the weisco's are OK (so they say) but need a tender break-in.
Like Gary660R said, get it done right and you'll be fine!
Happy trails [img]i/expressions/face-icon-small-smile.gif[/img]

 

I thought about this some more and I think I see what went on now. I don't think this engine is going to come from the factory with a forged piston. Then you go and slap a forged piston in this thing without checking the bore size. This engine is doomed before you even light it off.
The wiseco pistons I have used are a forged type, medium expansion piston. These things are going to grow a lot more that a stock cast type piston. You must get the clearences right, or you will run into the same problem you have been having.

 

Doc-It had a wiseco in before too, i got the same size that it had in it.

 

Medium expansion....Hell they swell more than my belly on a drunk night [img]i/expressions/face-icon-small-happy.gif[/img][img]i/expressions/face-icon-small-happy.gif[/img][img]i/expressions/face-icon-small-happy.gif[/img]

 

mahnster that's my point. It locked up before also. Same size piston without the correct clearences, and you got the same results, a seized piston. Measure it up, and follow Wiesco's recomended bore size and you will have no more problems.

 

It didnt seize before it had a blown base gasket. The rings were stuck to the piston.