Well, i realize that its not a LS1, but i just thought it might be of interest for comparison sake.
1990 F250 EC 460/E4OD
-removed air filter @ dyno
-3.5" straight pipe catback (no muffler)
223 hp, 365 tq
with N20 (~50-75shot??)
265 hp, 415 tq
dyno day was in McAllen Texas in July '05. So conditions could have definetly been better, i believe it was about 103 that day and as usual very humid.
best 1/4mile is 15.7
eric <><