5.3 bolt on + big cam , under 290hp ?

[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....

[BIG BLOCK 555]

hi kerrige i thought you will give me hard time about this cam , you didn't like it before .

Do you have a good free flowing exhaust? Long tubes, cats, what muffler, no kinks, etc

yup my exhaust is dual 3" into one magnaflow , no cats no other problems other than the usual small leaks on flangs ,
to tell you the truth i was shooting for 330 HP 330tq at minimum that's the goal from the start it will be boosted after one year

[Slow04xcab]

Dang I must've gotten pretty lucky. I have some cheap eBay headers with 2 1/2 collectors and 2 1/2 inch exhaust. Every dyno is different and will read different numbers. Still on factory injectors and fuel pump both with 175k on them. Will change pump and injectors once I'm able to change the heads and intake though. Also I didn't know it at the time of dyno but my trans was also screwed.

[kerrige]

My main issue with that cam is its huge for a stock headed older 5.3. Going over 230 intake duration in a 5.3 kills the power below 4500rpm you may have noticed the choppy nature of your torque curve. Now if you get some really well worked heads on it and 300 shot of spray then that's a great looking cam.

[Slow04xcab]

My main issue with that cam is its huge for a stock headed older 5.3. Going over 230 intake duration in a 5.3 kills the power below 4500rpm you may have noticed the choppy nature of your torque curve. Now if you get some really well worked heads on it and 300 shot of spray then that's a great looking cam.

Agreed