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I can't say from just a cam change I noticed a difference. I went from a stock L98 to a Lingenfelter 383. When the car rolled off the truck coming back from LPE...it had lots of clank from the forged lower internals..the choppy idle of the 219. I was all smiles.
Tuning is key for a cam change though...you'll have to suit the car to the new powerband etc.
Re: How did your engine react to cam change ? (Sliding)
Went from stock rockers to full rollers during an LT1 to LT4/Hotcam conversion.
I don't notice any increased valvetrain noise. But you will pick up a very cool "whir" from the Extreme Duty roller timing chain set if you choose to go that route :). Not as cool a sound as the chain drive in my Acura RSX-S but very close.