Engine STOPS

[rocketjr]

I wasn't sure of a good title to explain this, but here it is:

I just re-installed my motor after rebuilding my tranny and re-wiring the engine compartment over the past 14 months.

I got oil pressure fine from jump street but have loud lifters(they aren't upgrades)
I started the motor and it had idle surge. It also would stall out every time I tried to give it a little throttle to rev the motor up. I have DSM link and it wasn't reading the GM Maf through the MAFT. I replaced the MAF and the idle went to 2000 rpms and I couldn't bring it down. About 2 mins of running at higher than idle the engine just clanked and stopped dead.

I pulled the plugs and the tops of the pistons look fine. I can rotate the engine, by hand, and all the pistons move the way they should. All the valves appear to move the way they should, all though one or two have a slight squeek when rotating the motor. I can put the car in and out of all gears fine, put it into fifth gear and push the car rotating the engine. Still all the pistons, valves and cams move as they should. I have turned the motor over at least 360 degrees if not more and then back again with no strange sounds.

Everything appears to be fine but I don't want to start it again until I tear it down. Has anyone else ever experienced this?

 

[rocketjr]

OK i am removing the head and I find out that the pin on the intake sheered off. Know comes the million dollar question. Did the egg come before the chicken? Did the pin sheer on the intake and cause the motor to stop[ dead? Or did something else happen first to sheer the pin off? If the pin sheered first does the stainless steel valve have enough strength to stop the motor dead after spinning at 2000 rpms? Anyone have any input?

 

[rocketjr]

Well to finish this thread out here is the final analisys. Before I got the engine running I evidentaly turned the engineover too many times trying to get oil pressure that I all ready had. Mean while blocking the oil feed holes to the intake cam. Once this happened tha intake cam heated up and siezed causing the cam to stop and the valve to hit the piston which stoppped the motor dead and sheer the cam pin off. So it was my dumb fault for cranking the motor over too many times even though I had enough oil pressure to start the motor. The moral of the story is that when cranking your motor over if the oil light goes out while cranking you have enough oil pressure to start the motor. Hook it up and let it go....You won't have a pressure reading on the guage. I now have to get a new head and some machine work done to my block. I hope that this helps soemeone in the future.