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how do you determine lobe base circle?

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Old 10-11-2005, 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
Old 10-11-2005, 09:41 PM
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You measure it with a mic or calipers.
Old 10-11-2005, 09:51 PM
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I really didn't want to remove the cam to measure it. Is there another way?
Old 10-11-2005, 09:57 PM
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not that i know of
Old 10-11-2005, 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.
Old 10-11-2005, 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..
Old 10-11-2005, 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.
Old 10-11-2005, 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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