What do cam numbers mean?

**RyPkr_99** · 04-09-2005, 06:46 PM

Looks like some matrix mumble jumble to me. Can anyone explain what all the numbers, periods, and slashes mean?

**bthomas454** · 04-09-2005, 09:43 PM

what do you want to know? lift? lsa? duration? a little of everything?

**oldred95** · 04-09-2005, 11:28 PM

I'm in the same boat. A little of everything would be nice.

**RyPkr_99** · 04-10-2005, 09:30 AM

Yeah I just don't know anything about it. Maybe if somebody is willing give the numbers on a stock chevy cam and then a performance one and compare and explain them.

**bthomas454** · 04-10-2005, 09:39 AM

http://www.chevyhiperformance.com/techarticles/95298/
a pretty good read

**RyPkr_99** · 04-10-2005, 05:21 PM

Originally Posted by bthomas454

http://www.chevyhiperformance.com/techarticles/95298/
a pretty good read

Thanks that was pretty informative. Some of the earlier stuff kind of lost me though. I still don't really understand the numbers though. Take this for instance: 222/226 .569/.573 112

I'm guessing the 222/226 is the overlap? What's the rest?

**mds2004** · 04-10-2005, 09:03 PM

Originally Posted by RyPkr_99

Thanks that was pretty informative. Some of the earlier stuff kind of lost me though. I still don't really understand the numbers though. Take this for instance: 222/226 .569/.573 112

I'm guessing the 222/226 is the overlap? What's the rest?

Correct, that is the duration at .050
The .569/.573 is the lift and the 112 is the lobe seperation. If I am incorrect someone please correct me.

**forsaken_one** · 04-10-2005, 09:38 PM

222/226 .569/.573 112

222 Is the duration that the intake valve is open
226 Is the duration that the exhaust valve is open
.569 Is the intake valve lift
.573 Is the exhaust valve lift
112 Is the lobe separation angle between the exhaust and intake lobes
The lift numbers are commonly used with 1.5:1 rocker arm in mind.