Which Tbolt IV Module is the best for the SBC with Late Model L31 Vortec Heads and 9:2-1 Compression???? Engine has a roller valve train and is running a 600 Edelbrock.... Boat is about 42-4400lbs loaded.......

Thanks..

I can't answer your question but I have a module (TBIV) of a 350 mag. I may not use thats almost new.

Don't know if this wil help I 'am a BBC type but Dennis Moores book on marine performance showed me how find the the best total timming and the best base timming and I ended up useing the V 6 module because my slightly modified motor needed a lot of base timming to idle well.If we can find out if the same rules apply to both big and small block timming I can post more info on the very easey way to finding you best numbers.