No it's just physics. The runner length of the LT intake tunes with the 5th harmonic, which is much, much weaker than the 2nd, 3rd, 4th.... the more waves the weaker they are. The LS1 works in the 3rd harmonic one reason why it makes more power and TQ.

Only solution is a different intake manifold.

Bret

 

thanks...what about the LT4 intake manifold. What harmonic does its runner length equate to?

 

Measure both of them..... it's runner LENGTH. Last time I checked they both look the same.