Schooled you on carbs... Guess it's time to get schooled in mech injection.
How to leak down a BV using a 2 gauge tester:
1. Block off all injector lines & returns except for hat nozzles
2. Connect dual gauge tester to outlet of compressor
3. Set Air Compressor to read 100psi on 1st gauge
4. Connect tester to inlet of barrel valve
5. Read % on 2nd gauge
A good starting point for a blown motor is going to be 25% on a dual gauge. 75% on a single gauge tester.
Now, go buy this book:
http://racecarbook.com/firs.shtml