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Old 01-22-2012, 07:54 PM
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LS or not LS

ON one of the weekend moter head cable showes they said the vortec 5.7s were a LS just with a cast block. I wanted to know if my 1999 tahoe with a 5.7 vortec was an LS with a throttle body ?

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Old 01-22-2012, 08:35 PM
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its a 5.3L vortec 5300 325ci bore/stroke:3.780 x 3.622,

285-320 hp and 325-340 lb-ft,
based on the ls platform. basically an ls with iron parts. good news is its pretty cheap to hop up. should be able to squeeze 400hp@flywheel with no problem. drop in a cam and do some head work shouldnt cost more than a grand or two at the most. check out chevy high performance's article "ls engines decoded" i have the issue, very informative indeed
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Old 01-22-2012, 08:47 PM
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1999 is actually the last year of the "old body style" Tahoe. The 5.7 in that truck is the Gen II 350. It is not an "LS" engine. The Tahoe got the 5.3L Vortec engine in 2000. There was never an "LS style" Vortec 5.7.
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Old 01-23-2012, 06:01 AM
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Quote:
Originally Posted by Blazin72
1999 is actually the last year of the "old body style" Tahoe. The 5.7 in that truck is the Gen II 350. It is not an "LS" engine. The Tahoe got the 5.3L Vortec engine in 2000. There was never an "LS style" Vortec 5.7.
Correct. However, note that the '97 'vette was the debut of the 5.7L LS1.
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Old 01-23-2012, 12:44 PM
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Quote:
Originally Posted by whyholdback
Correct. However, note that the '97 'vette was the debut of the 5.7L LS1.
Yes the Corvette got the new engines in '97, Camaro and Firebird in '98, Silverado and Sierra in '99 and SUVs started in '00. However, the LS1 was not a Vortec/truck engine. Hence the reason I said "There was never an 'LS style' Vortec 5.7."
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