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Generation III Internal Engine 1997-2006 LS1 | LS6
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PTV related to LSA

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Old 04-05-2011 | 09:44 PM
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Default PTV related to LSA
How much does lowering the LSA/ICL alter PTV clearance?
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Old 04-05-2011 | 10:07 PM
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The biggest factor is the lobe duration.
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Old 04-05-2011 | 10:15 PM
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232/234 112+2 Was told it would safely clear most likely with .080/.100 clearance Pretty much a Torquer V2. I'm kinda wanting to order one on a 110+2 but I don't have a clue how much it will affect my PTV clearance.
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Old 04-05-2011 | 10:23 PM
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That cam will be fine. The trex is bigger on a tighter lsa and works with stock heads. It's always a good idea to measure
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Old 04-05-2011 | 10:25 PM
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Heads are 62cc with 2.04/1.57 valves
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Old 04-05-2011 | 10:30 PM
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Well, you got me on that one....Might want to call a sponsor and see what they recommend for your setup??
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Old 04-05-2011 | 10:39 PM
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I'm asking about ANY setup. I wan't to know how it affects it.
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Old 04-05-2011 | 10:47 PM
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My 232/234 on a 112+4 clears my 62cc 243's just fine.
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Old 04-05-2011 | 11:01 PM
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What I'm saying is how much difference +/- is there by shrinking LSA and advance by two degrees each
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Old 04-06-2011 | 03:51 PM
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2* +/- should net 25 thousandths from what my head porter told me.
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Old 04-06-2011 | 05:24 PM
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Don't quote me on this as ramp rates can effect PTV clearance, but a rule of thumb is ~.010" for every degree earlier. Remember 2* duration opens the valve only 1* earlier
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Old 04-06-2011 | 08:04 PM
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Originally Posted by bluecajun5.3
2* +/- should net 25 thousandths from what my head porter told me.
Wow, that's more than I was expecting.
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