Camshaft differences
 

I currently have a Mark IV 454 in my camaro with a comp cam. The comp cam is hydraulic and spec'd at 280/280 advertised duration, 230/230 duration at .50, and 520/520 lift. The cam in the new motor I am replacing my motor with is a roller cam, 211/230 duration at .50, and .510/.540 lift. I love the way my current motor sounds at idle, and the new motor will have a much better set up as far as heads, pistons, etc....will I retain the general sound at idle with the new cam? Headers and exhaust will be exactly the same. I realize this is a very superficial look considering all the variables......the new motor is spec'd much better than the old one. Your input is appreciated!

I would think similar but not exactly the same, you could always swap the cams if it's that big a deal.

Thanks Y2K....I ended up buying the Chevy Performance ZZ454 and as I was checking out cars on Youtube, I searched ZZ454 and about 50 tubes came up with cars that have that motor....at idle, acceleration, etc. Several had the distinctive flowmaster sound, and it would appear that I will keep the sound I like so much and get the performance and streetability that I am also looking for Pretty happy guy here!

lsa will have an effect on the idle

All's well that ends well,bet she's a beast!

I did a little research and found the current comp cam to be a 110 LSA and the new cam to be 112. Based on what I read with all things remaining the same, the new cam's idle might be a little more tame.....but given the differences in duration and lift between the two, I don't know where it will end up. At any rate, I guess we will see next week!

Yep, lobe separation angle makes a difference.

I've been reading cam specs till my eyes started bleeding.. It's crazy how may different grinds there are. I contacted Chris Straub and he recommended a Adv. 288/300 .050" 229/241 LIft 600/570 with 1.7 109 Lobe Sep Which is probably what i'll use in my 454