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Generation III Internal Engine 1997-2006 LS1 | LS6
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how do you determine lobe base circle?

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Old Oct 11, 2005 | 09:31 PM
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Default how do you determine lobe base circle?
Just wondered if there is some way to determine intake and exhaust base circle without a cam card. The only information I have is .602/.602 236/236 112+2
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Old Oct 11, 2005 | 09:41 PM
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You measure it with a mic or calipers.
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Old Oct 11, 2005 | 09:51 PM
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I really didn't want to remove the cam to measure it. Is there another way?
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Old Oct 11, 2005 | 09:57 PM
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not that i know of
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Old Oct 11, 2005 | 10:17 PM
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The specs look like Comp XER lobes. Call Comp Cams tech. You could try and PM Unaffiliated Racing. He works for Comp, but he hasn't been on the board here in about a month. I'll PM you his contact info.
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Old Oct 11, 2005 | 10:19 PM
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yes it is a comp xer lobe just was wondering if there was a way to determine without waiting to call tommorow

Thanks for your help
..RJ..
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Old Oct 11, 2005 | 10:29 PM
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I do know that a 224 XER lobe has a 37.5mm or 1.47in dia. base circle. Yours should be close if not slightly less.
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Old Oct 11, 2005 | 10:32 PM
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my guess its close to 1.45, though as stated you'll want to measure.
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