Thread: Another Cam Selection Question!

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Roger, the 30/30 I have was pretty radical in the 265, but rather tame in the 400 and it busted a valve spring in the 400 somewhere between 6 and 7 grand.

Originally Posted by NTFDAY

Roger, the 30/30 I have was pretty radical in the 265, but rather tame in the 400 and it busted a valve spring in the 400 somewhere between 6 and 7 grand.

Ken,
I understand what you're saying. The only things that one can change in a cam are the lift, duration, overlap and advance/retard relative to TDC, right? So doesn't it infer that a "bigger" cam for a specific engine, say the 283, is going to have more duration, more overlap, and perhaps more lift than the "milder" cam, or am I overlooking something basic? Of course the bigger engine or performance heads for the 283 will have bigger valves to breath better, but I'm just trying to clarify the understanding of the cam numbers. This is not a big deal, but sometimes we throw around terms that are second nature, not thinking that the guy asking the question may not be so well versed in how to spec a part, like a cam.