Originally Posted by
Stealth97
You checked compression and leakdown in all 8 holes?
Compression tells you if a ring is fried. Leakdown tells you if valves are fried or not opening/closing
This is a new motor, right? Is it possible a valvespring broke? I'd pull the valve covers just to give it a look see. Easy thing to do (well, on my truck anyway).
I'm wondering why it layed down at half track. Layed down on a shift too I assume? Overrevved?
Is it possible that a valve came in contact with a piston at high RPM (valve float) and now all your valves are bent, leading to no compression?
Just trying to be of assistance. May not be EFI related, but hard parts related.
Please let us know what you find! I am very very interested to know.
Eric / Stealth