my heads have already been selected for my 4.8 build, as for intake manifold i plan on selling my tbss and was originally going to go holley hi ram. i now work for quartermaster which is a branch of comp cams and was told that i get parts for x% above cost. i will be swapping out my cam for a custom grind and was also told that i can purchase the fast lsxrt for around 400 or so...long story short this changed my input on everything. with the cam specs ill probably be turning 7k-7200rpm vs the 6800 im spinning now. my question comes down to is which intake would be the better one? and also which one would work better with nitrous?

thanks in advance

T.J.

 

With 4.8 id stick with tbss. Holley is for bigger cube and dont shine til high rpms in 6.0s and above, so in a 4.8 forget it. Fast is too much in 4.8 also.

 

correct me if im wrong but im pretty sure a member here did a dyno test of the fast lsxrt on his 5.3 and picked up just about 20rwhp at 6k on a stock nnbs?

 

THere is a difference in cubes between a 4.8 and 5.3 and mostly everybody has idle issues with a fast truck intake.