overdrive

what would be the most efficent overdrive for a 871 littlefield standard rotor roots blower on a 547 merlin bb chevy hat and port inj. on alky with -2 brodix heads flow 360 cfm. 801 lift with 1.75 int. rockers duration @50 int.288 ex.296 in a 2000 lb. altered

 

Need more info;
how much hp are you after,timming,how much fuel,and most of all how much do you love your motor.25-30 percent will be safe.

 

Blower Boost

If The Engine Has Been Run Do You Have A Data Recorder That Tells Your Manifold Temp. The Thing To Remember Is Hot Boost Is Not Good Boost. Cooler Boost Makes More Hp. I Would Agree With Greg On The Ratio Of Safety.

 

What is a good manifold
tempreture for a screw blown car ????????????????

 

blown chevy

thanks for the reply: we are running the timing @ 34 degees the fuel @ main jet .100 highspeed @ .60 jet @ 59lbs.fuel pressure.with the blower @ 56 overdrive(871 littlefield 547ci.chevy) this combo.went 4.50@149 in the 1/8th @ 2692 density altitude. when we first built the engine we had it on the dyno made 1320 hp.@ 6700 rpm. haven't dynoed it with the more overdrive. my question was what's the max effecient overdive on this particular blower? forgot to tell the fuel system has been flowed at performance engines celina tx.110 enderle pump, at 3733 pump rpm pressure@145 lbs.