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Old 09-18-2011, 11:05 PM   #1
spdrcr29
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Default 1971 LT-1 Cam Specs?

Anyone know the specs (Lift, duration, etc.) for an original 71 LT-1 Camshaft?
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Old 09-19-2011, 08:02 AM   #2
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I 229 E 237 @ .050 .452/.455
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Old 09-19-2011, 08:55 PM   #3
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Thank you!
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Old 09-19-2011, 09:02 PM   #4
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That may be a modern day replacement cam for the LT1 but the original had way more duration than that. It wa a long duration low lift solid cam. Not really a good cam for modern day engines. It needs a high compression piston and rpm to really work well.

Lookimg arond the duration at .050 is more like 242/252. Those are the numbers that are more like it.

Last edited by Gordonm; 09-19-2011 at 09:08 PM.
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Old 09-20-2011, 01:21 PM   #5
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Duration at .050" is 242/254, lift .459"/ .485". To give you an idea of how it compares to a hydraulic cam, doing the math the durations are 231/239. Decent cam for 10.5:1 compression when using the stock exhaust manifolds. If you run headers you can increase your cam selection.
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Old 09-20-2011, 02:05 PM   #6
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The cam specs. posted earlier are listed for 3972178.
another source gmpartsdirect
3972178 Mechanical Flat Tappet 70-71
(ID#3972182) duration at .050" tappet lift (intake/exhaust) is 242/254; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 435/455. Valve lash is 024/030 and lobe centerline is 116 degrees.
(& in their chart as
I:.E:.455"
E: 435")
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Old 09-20-2011, 02:05 PM
 
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