hi everyone

i have a 5.3 with bolt on and 231-239 617-621 113lsa stock heads and stock intake and a cluch fan .

now this numbers are taken on a pull till 5600rbm , i have set my cut off to 6500rbm

i know i should at least be around 310+ hp 326tq , i have with me now a set of 799 heads and a NNBS intake , what is your recommendtion on this compo , how much to mill from heads , am i better off with another intake , i ordered nelson fan harness and soon it came it will be mounted with 05 oem e-fans

here the dyno pull chart :



tune was done on street maybe after 1 month i will do it on a dyno with the same tuner

 

Jesus, who spec'd the parts for this build?

 

what is wrong ? tell me so i can fix it

 

Port and mill the 799s. The NNBS intake and E-fans will make a huge difference. I would suggest a slightly smaller cam for a 5.3. Might not make as much peak HP, but it should make for more torque early in the powerband.

 

This^^. The cam is pretty close to the same cam I ran in my 408. It is way too big for your 5.3 IMO. But you have some good parts to add that will make it run much better.