Originally Posted by vinniekq2
That cam and CR are getting close to max for pump fuel with iron heads.We can ask tech to check the cr for you. We need exact cam specs,intake center line and lobe separation.You might need a bigger cam? I use a bigger cam in a small block with 3.50 gears.I wouldnt want to spend a lot of time in stop and go traffic,unless of course I was at the front at every red light.
My CR is 10.75:1 with aluminum heads
LSA is 110 and intake center line is 106 making the cam 4 advance. you can get away with more compression because of aluminum. i figure my cam will bleed of some compression so theres not so much cylinder pressure to make 91 octane ok. intake valve closes at 50