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As an ex Chevy Mechanic I'm almost positive the answer is "it will fit". 4L60E transmissions if I remember correctly.
The 5.3 liter Vortec Engine on the 2000 Chevy Silverado has a tapered crank shaft. The crank pulley has no woodruff key, is not indexed and is pressed on.
I own a 93 Chevy Silverado K1500 4x4 with V8 350 TBI 5.7L. so unless Chevy has changed their blocks, i would suggest that naturally your block is a SB 350. However, since your question was about horsepower, not which block you have, I will tell you the horsepower. The 1998 Vortec 5.7 liter makes 255 horsepower.
The 4.9 vortec means that it is a 4.9 liter v8 probably.
No, the LS2 is an all aluminum 6.0 liter engine. The 5.3L engine in the 2000 Silverado is an LM7 version of the Vortec 5300.
About 290 hp.
Yes.
A 2000 Chevy 4.8 liter vortec engine usually takes 6 quarts. It truly depends on the vortec engine, usually the standard is between 5-6 quarts to fill the engine.
5 quarts of 5w-30
5.7 liter vortec.
Five
270 hp