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Somatic Negative Optimist
Join Date: Mar 2002
Location: Winlaw, BC, Canada
Posts: 7,206
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The 964-cam just gives you more lift; meaning: The intake valves stay open longer to suck in more mixture. That will only work if you also get larger intake runners with ~38.5mm I.D. and bore out the heads to 38.5mm.
The early SC's '78-'79 had larger runners but in '80, the I.D. changed to 34mm.
Does a Carrera have the same smaller intake runners as the '80-'83 SC's?
A change of cams will not affect smog checks but changing the cams alone makes no sense; other stuff will also have to be done to give you more HP.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats. 
Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
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