[Henry Schmidt]

Sorry Wanye but the spec book is wrong. It is also schizophrenic. You see the book says to different things for the same cam.
The truth as I see it is that the 911 "E" cam is Porsche part number 901 105 181 00 and 901 105 110 05. These cams time @ 3.00 - 3.30 mm. and 2.70- 3.10 in the later model.
Now if we read the 1969 spec book on page 46-47 it says that 911 "E" cams have two different grinds 901/09 and 911/01. We all know that Porsche does not give identical part numbers to two different parts. So we have to conclude that one spec is incorrect. How do we choose which is incorrect. Well let's look at a later book. In the 1973 spec book the 911 "E" cam is listed on page 42-43 911/52. The part number seems the same. 901 105 181 00 and 901 105 110 05 Now in this book the cam timing is slightly different. How different? Well it's a couple of degrees different. If we look at the cam specs we'll see the specs just a couple of degrees different from one of the cams in the earlier book. Perhaps it would make sense that the spec that is just a couple of degrees different would be the correct spec 911/01. This Remembering that Porsche generally doesn't give two different parts the same number which do you choose.
Now if you chose the cam spec with the lesser lift and duration lets see if there are any cams with the same spec. Oh my. There seems to be a cam with the lesser spec in an earlier book. Yes it looks like the 911 "L" 901/06. Next lets look at the 911 "L" number 901 105 109 05 that's not the same ( oh yeh, no pump drive) and 901 105 110 05. Where have we seen that number before? Oh yeh 911"E".
It may be a little confusing but 911"E" cams and 911"L" cams are the same. Solex cams are a cam all by them selves. No other cam has the same lift at overlap and no other cam has the same part number.