Making sense of numbers

[Briana]

Could someone please help identify the following numbers. These items are off a 1970 911E case (engine # 6200133)


camshaft # 90110510402
piston diameter 89.98
intake valve 1.80" 91110541120
exhaust valve 1.60" 91110541550
cylinder head casting # 9111043020R
cam housing # 9011051110R

Thanks,
Brian

[Tim Walsh]

can't tell you much, but the piston diameter makes it sound like a 2.5 or 2.7 depending on what the crank is.

I looked up the cam # in on the forums and couldn't find anything. no official docs by me at this point. sounds like it could be a fun motor

[camgrinder]

I believe the cam is a factory racing cam part number. Is the cam drilled for center oiling?

[Briana]

John,

Yes they are hollow centers.

[camgrinder]

Sounds like a 906 cam.

[Briana]

Really? These are in a 70 911E case with 90mm Mahle RS pistons. Any ideas what kind of application this engine would be good for?

[Tim Walsh]

Do the cams have an MFI takeoff on them? If so they're almost definitly race cams and probably pretty high strung ones, not a good street motor. (8300 or so redline).

If they don't have the MFI takeoff then it's possible they're very early solex cams, or they could be race cams from a carb'ed car. Solex cams are somewhere inbetween E's and S"s when it comes to powerband.

[camgrinder]

"camshaft # 90110510402"
Could the number be 901015109 ?
What is the other side camshaft casting number?

[camgrinder]

I looked thru my data, the 901 105 104 02 is the correct casting number for the 906 cams.

[Briana]

Thanks guys! This has helped a great deal.