A cam question

http://www.turbobricks.com/resources.php?content=camspec

I found cam A at local garage but from the above link, there are 2 cam A. One is from b230 (254/10.5 lift) and another one form b18/b20 w carb (248/8.9). How can I know whether the one I found is from b230 or b18/b20? Any physical difference between these 2 cams?

Thanks,

Google a picture of "volvo b18 camshaft" and then "volvo b230 camshaft", easy to tell the difference.

Thank you,

I thought that b18, b19, b20, b21 are the same engine with different capacity and cam from b18/b20 can be used with b230/b21. But from pictures in google, my understanding is wrong. they look totally different.

B18/B20 are pushrod engines, B21/B23/B230 are overhead cam. The blocks share common architecture but there were a lot of changes. The auxiliary shaft in an overhead cam engine is for all intents and purposes a neutered pushrod camshaft put there to drive the distributor and oil pump.