Quote:

run at 11:1 on pump gas and make power without a huge cam to vent cylinder pressure out the exhaust at lower engine speed.




inform this

"variable cam timing" in the gen3

I wonder what that does?

and the LS7 "Variable valve timing (VVT) is a standard feature on 6.0L and 6.2L engines"




it's pretty much standard on 11:1 pump gas engines

it has nothing to do with production of power, it's rather for the prevention of knock.

the thread starter will probably not find a variable timing camshaft for his BB mopar. that being said he should probably go with raised ports if he wants all out power. combustion chamber design and flame travel has very little to do with power. they are to prevent knock/detonation.


Quote:

A technique used to prevent the onset of knock is the high "swirl" engine that forces the intake charge to adopt a very fast circular rotation in the cylinder during compression that provides quicker and more complete combustion. It is possible to manufacture gasoline engines with compression ratios of over 11:1 that can use 87 (MON + RON)/2 (octane rating) fuel with the addition of variable valve timing and knock sensors to delay ignition timing. Such engines may not produce their full rated power using 87 octane gasoline under all circumstances, due to the delayed ignition timing. Direct fuel injection, which can inject fuel only at the time of fuel ignition (similar to a diesel engine), is another recent development which also allows for higher compression ratios on gasoline engines.