Highest compression on 87 octane with aluminum heads

[Trashcanman]

Im building a sbc with air flow research 180 aluminum heads. Im shootin for 400 hp on 87 octane. its a 350 with a healthy cam. About what compression ratio can I run with 87 octane and not have to retard the timing?
Intake Duration at 050 inch Lift
228Exhaust Duration at 050 inch Lift
234Duration at 050 inch Lift
228 int./234 exh.Advertised Intake Duration
284Advertised Exhaust Duration
290Advertised Duration
284 int./290 exh.Intake Valve Lift with Factory Rocker Arm Ratio
0.480 in.Exhaust Valve Lift with Factory Rocker Arm Ratio
0.494 in.Valve Lift with Factory Rocker Arm Ratio
0.480 int./0.494 exh.Lobe Separation (degrees)
106

 

[Trashcanman]

and yes its going into a fj40. Im building it as light as possible in front so I can pop a wheelie. relocated the gas tank and battery behind the rear axle. fiberglass front end etc. I want it to run on 87 because all of my other vehicles require premium and its killing my pocket book

 

[Splangy]

Just build it to run on premium. It's not going to be a daily driver from the sounds of it. Who builds a HP engine to run on 87?

and yes its going into a fj40. Im building it as light as possible in front so I can pop a wheelie. relocated the gas tank and battery behind the rear axle. fiberglass front end etc. I want it to run on 87 because all of my other vehicles require premium and its killing my pocket book