SBM Edelbrock/Speedmaster Head Data

Earlie A said
Haven’t watched those before. Thanks.

The cfm formula above calculates the total cfm demand for the entire engine, the flow that the carburetor would see.

Yes, (to me I considered it the dynamic/functional displacement of the engine, in that Eg. I view those 3 engines to be dynamically the same size 506 cubic feet per minute.)

Earlie A said
In the second video you posted there is another cfm demand calculation. Cfm=(cid x rpm x 0.0009875)/(# of cylinders). That’s the formula that equates to the demand of 1 cylinder on a flow bench at 28”.

For instance, a 360 engine at 6000 rpm would require a port capable of 266 cfm at 28” on the flow bench. Then, if you know the target velocity, the average CSA can be calculated from the cfm.

Agree