We are now asked to input information on what induction system we are going to use. This could be two or four barrel carb, single or dual plane intake manifold, as well as choices for fuel injection or even forced induction. In this case, we don’t know who is going to end up with this engine, so we are going to be a little conservative and use a four barrel dual, plane intake manifold. Some will argue in favor of a single plane manifold, which will make more power, but since this will have plenty of torque, we are going to go for some low end drivability instead of maximum power numbers. If we were building this engine directly for a customer, we would have an interview with that customer discussing what they are looking for, and then make recommendations that would combine our experience with the customer’s expectations. The end result will hopefully satisfy the person paying the bill! Don’t buy an engine just because it makes big dyno numbers! We have customers that went that route first and ended up with something that just wasn’t fun to drive. You don’t drive the dyno!
Now we input what size carburetor we intend to run. In this case (since we are supplying the carb) we opted for 800cfm. Next we are asked for what exhaust will be used. We are going to assume small tube headers and mufflers. Anything smaller than one and one half times the size of the exhaust valve is considered small tube.