5.3 bolt on + big cam , under 290hp ?

[BIG BLOCK 555]

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

[Botlfed]

to much cam for those heads and intake, that's similar to my cam and it states must have aftermarket heads.

[canada4g63]

heads are choking, throw a good set of heads on there

[BIG BLOCK 555]

yes i have another heads (799) i didn't put them in yet plus i plan on buy complete vic jr intake with 90mm tb

if those don't help a lot i may look into genx heads

[Slow04xcab]

Heads will definitely help. I was a lil disappointed in my dyno as well. I run a little smaller cam 228/232 but managed 325/300 and know with better heads and nnbs intake with 90mm tb I should pick up nice. Good luck bud and may ask someone who understands valve events more than me but milling may cut you close on ptv with that cam.

[kainedogg]

Swap the heads out for now. Ask the cam manufacturer if you need to have reliefs cut in your pistons for ptv clearance if you shave your 799's .030.