motors needs 4000 rpm stall converter headers 11:1 compression ratio and 4.11 gearing ... needs 4000-4500 rpm stall converter headers 11.5:1 compression ratio or better and ... needs 4500-5000 rpm stall converter headers 11.5:1 compression ratio or better and ... motors needs 5000 rpm stall converter headers 12:1 compression ratio or better and 4. ... motors needs 5000 rpm stall converter headers 12:1 compression ratio or better and 4. ... needs 5000-5500 rpm stall converter headers 12.5:1 compression ratio or better and ... well with 4 or 5 speed transmissions headers 12.5:1 compression ratio or better and ... well with 4 or 5 speed transmissions headers 13:1 compression ratio and 5.13 gearing ... needs 5500-6000 rpm stall converter headers 13:1 compression ratio or better and 5. ... stall converter or 5 speed transmission headers 13:1 compression ratio or better and 5. ...