5.3 bolt on + big cam , under 290hp ?

[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.

[BIG BLOCK 555]

Slow04xcab

nice gains , yup i did take the old heads for now waiting for my 799 to arrive so i can start working on them , thank you sir

kainedogg

beau from TSP told me to not go above 0.15-0.17 i will ask comp cam for ptv clearance , thanks

[kerrige]

Do you have a good free flowing exhaust? Long tubes, cats, what muffler, no kinks, etc. Besides that it is an issue with the heads most likely. Keep in mind 290 is about 80 over stock....