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where to find #'s on ls 1 heads

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Old 06-19-2007, 07:09 PM
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Question where to find #'s on ls 1 heads

i am curious where to find the right #'s on factory heads? i see 306 on the out side of the heads and cnc on back of the heads but wanna know for sure if there stock or something else? any help would be great!
Old 06-19-2007, 11:05 PM
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It should be here:



The 243 location, not the small ones.
Old 06-19-2007, 11:09 PM
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853's will have that side be flat and the casting on the left side (if you are facing the exhaust ports).




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