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Old 04-27-2010, 06:19 AM
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cam shaft specs

I,m rebuilding my Lt 1 350 chev currently i have a chev off road solid cam with the number 756 stamped on it, I,d like to find the spec,s on this cam so i can determine what cam to replace it with.

Regards Peter

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Old 04-30-2010, 08:49 PM
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camshaft

that may be a sealed power camshaft. try using the number and do some online research
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Old 05-01-2010, 03:23 PM
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You can determive the cam you have now by measuring the in and ex cam lobe lift.

GM used two factory cams and 2 off road service cams for the Z/28 LT-1 motors.

early 70 LT-1s had the duntov 30-30 cam "346" cam 254-254-.485-.485 114LSA

later 71 and 72 LT-1s had a upgraded cam with less intake duration and wider LSA for smoother idle/more low end w auto trans. 242-254 .459-.485 116lsa .024"-.028"

First design off road "140" cam 257-269 .494-.512 .024-.026 112lsa

second design is a biggy 262-273 .518-.536 112lsa.

Measure the lobe lift and x 1.5 for valve lift.

all the cam companies and GMPP sell new replacements for these original cams.
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