Highest flowing sbm heads?

John you say your duster is not a go fast combo, does it have factory front frame rails? Inner fenders? Firewall, backhalf car sounds fast to me

Like all strictly bracket race combos I sacrifice some things that make it consistent over some things that would make it faster. I know for a fact it would go .20 fast plus with a 10 radial tire. A 14-32 slicks is not a go fast tire when honestly it’s not needed. My budget style of racing has me running a timing chain instead of a belt, of the shelf pistons instead of special race pak rings and special coatings, no light-weight parts that drive costs up, no torque plates used during boring, home done hone jobs, I could pay someone good to do my porting work instead of butchering them myself. There’s a big chance a vacuum pump would help my combo and the list goes on. Take all of that and I’ve added 300 plus pounds to this car since 2010.