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Generation III Internal Engine 1997-2006 LS1 | LS6
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what are the stock valve size on 5.3's?

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Old 02-12-2008, 11:40 PM
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Default what are the stock valve size on 5.3's?
whats is the stock valve size on 5.3 heads?... also whats the stock runner size ?
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Old 02-27-2008, 12:05 PM
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dont hold me to it
Intake - 2.02”
Exhaust - 1.57”
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Old 02-27-2008, 05:47 PM
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intake just under 1.9 (1.87 I believe) and 200cc runner
exh 1.5 and 70cc runner
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Old 02-27-2008, 07:27 PM
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Stock valve sizes are 1.89 intake/1.55 exhaust.
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Old 03-17-2008, 06:03 AM
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What about on an LS1. 98 model
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Old 03-17-2008, 08:32 AM
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But the seat (will) hold a 2.02"intake valve & 1.57" exhaust valve.
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Old 03-17-2008, 02:56 PM
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Originally Posted by Benner
What about on an LS1. 98 model
2.00/1.55
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