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Stock LT1s were rated at 275-285HP depending in the year. Few stockers I've seen dyno'd ranged from 245-27RWHP.
Rule of thumb is 10% loss on a manual and 12% for auto.
The numbers their posting seem about right for crank HP with those mods.
Just remember you need the stuff not included to support the HP, Fuel pump(s), injectors, tuning etc.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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