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Registered
Join Date: Jul 2005
Location: Des Moines, Iowa
Posts: 174
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2.7 911S Heads
Can anyone tell me for certain if the '74 or '75 911S heads have larger valves than the standard heads. Anderson, in his book, states that all the 2.7 heads (911 104 342 2R) are the same with 46mm intake and 40mm exhaust and these were used on all engines from 1970 to 1977. I have seen some heads for sale on Fleabay and elsewhere advertised as 911 S heads and they claim to have larger valves. If they do will they fit my stock 2.7 with CIS and will they provide any better performance?
Ventana
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'74 Coupe, G/P White, went to the ex in the divorce 
'86 HD FLHS, 100 CID, Kick Azzz Purple
Last edited by ventana; 02-12-2008 at 07:09 PM..
Reason: add part number
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