I was again searching online for more info and came across this link...
http://www.camaroz28.com/forums/showthread.php?t=472223

Over there I saw the following quote....
Originally Posted by LT193
Re: Modular ford VS LS1 Gm powerplants.
Well first some of the advantages they do have over our motors.
1: no noise at idle and smoother running engine.
2: better gas milage in stock trim and modified trim.
3: less maintanance when it comes to the valve train.
4: Less compression stock which enables better boosting.
5: Overhead cam ability which enables high RPMs.

Advantages of LS1 motor
1: Cubic inches over fords modular 346 to 281.
2: more compression to help the NA guys (like me)
3: Great flowing heads and intake, unlike a mod motor an ls1s intake flows well.
4: Great bottom end that is probably stronger then your adverage 281 Gt motor (unless compared with cobra motor)
5: more aftermarket and cheaper parts.

These are some things i can think of right off hand, although i must say a 4 valve head on a cobra motor makes exceptional flow over an LS1 head. I have seen 320 CFM out of a 4 valve head, and i know that it is capable of more. This is a limiting factor with LS1s, even know they flow almost as well with half the valves i dout that they could ever flow as well as a 4 valve head. Anyone have any ideas yet?


... and this guy is a GM fan?