What would be the difference in these powerbands if both cams were on XE-R lobes? The motor would be a 382 LS1.

-224/228-110LSA

-228/226-110LSA

Which one would work with the stage II Patriot 5.3 Heads the best? I always thought traditional splits made better power N/A. But, Sportside5.3 on here, had told me about reverse splits being more efficient due the intake flowing more than the exhaust on the head, or something similar. And that the reverse split would make a somewhat better torque curve.
When I started thinking about it, the stock cams in the 4.8/5.3 motors do have a reverse split (191/190).

Anybody have any thoughts on this?

 

ttt...

 

It has to do with the effiecency of your exaust system. From the ports on back. If everything is completly free flowing, meaning excellent exaust ports, nice long tube headers, no cats, and a well flowing muffling system (true duals), then you can get away with reverse splits. If your intake to exaust ratio was very close, then you might consider it, but with a Patriot head, I'd stick to the traditional. With the 2 cams you have posted, all things being equal, the 228/226 will probally out power the 224/228 due to it's larger intake charge. When comparing cams like that, it's better to use the same intake duration and split the exaust accordinglly. This way you have the same amount of air coming in, and you can contrast how you want to get it out. I prefer to stay traditional myself. Even with a completly free flowing exaust on my SS, I still plan to run almost 10 degrees of foward split on my 454.

 

I'm pretty sure reverse split cams are best with turbo motors to get them to spool up faster. If the exhaust duration is too big, the turbo won't spool up very fast under moderate loads just like a big cammed N/A car can be weak down low and stumble a little.

Jason

 

You need to really analyze where the valve events are happening. Honestly it isn't as simple as forward or reverse split. You need to pick your valve events based on what the motor needs and the split will take care of itself. To say that one is better than the other or that you must run x number of split to make optimum power is a gross oversimplification of what is really happening.

 

Hey Geoff, would that cam you recommended (224/228-.58x/.59x-110) run pretty good in a 382 as far as vacumm/brakes, gas mileage, etc?

Off topic, but how much of a gain would I see with that cam, patriot heads, and 382, with a truck intake manifold. Versus the same set-up with a LS6 manifold? Thanks!

 

It should drive great in a 382. We haven't done a huge amount of testing of the truck intake vs. the LS6, but in one instance a while back a customer went to the trouble of putting an LS6 intake on a 5.7L engine in his truck. It literally did nothing. Keep in mind that this is just one test and YMMV based on other conditions.

 

these cars like traditional over reverse more often than not