How can I identify camshafts?
What numbers should I be looking for and any other obvious things that help tell them apart (eg say a 998 cam from a mk1 S cam)?

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Respect mine and I'll respect yours.

Numbers, lobe size (width), drive, number of rings. Grab a Vizard book. It will help identify factory cams.

small-bore cams are normally narrow lobes (3/8"ths) & pin-drive-->, except the Late A+ 998 which are slot/spade drive

1100"S" cams are all wide lobe 1/2" & are spider drive

Cooper"S" are wide lobe & pin-drive

Late 1275 A+ are all spade-drive wide lobes

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If you are planning on finding a suitable cam for your twinky to grind all the lobes off, then maybe a spade drive cam as they`re easier to find,,, easy to get oil pumps to suit,,, & also fit the block you`re using too

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

If you find any narrow lobe spider drive cams, they came out of a 998 auto or 1098 auto.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

cooper s cams dont have the fuel pump lobe , well mine didnt

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A good friend will come and bail you out of jail...but a true friend will be sitting next to you saying "Damn...that was fun!"

David Vizard's book "tuning the A series engine" has an excellent table for identifying factory camshafts including the performance cams available from the factory.

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1970 Cooper S ex-Bathurst & ATCC
1964 Austin Cooper S ex-Group C race car
1967 Morris Cooper S ex-Group B
1962 Mini Speed sports sedan
1968-71 ex-Peter Manton Shell car

I have always wondered about a particular Cam shaft that I have which is spider drive type and 3/8 lobe. What would it's origin be?

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

Automatic 998 mini or auto Morris 1100 (1098) for sure. The autos all got spider drive until 1980 because of their HUGE oil pump.
A pin drive would shear off driving that pump.
I have no idea what the Rover automatics have from 1980 on, whether still spider drive or they went to slot drive.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Kev Now I know what it is from.

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"