SBM Edelbrock/Speedmaster Head Data
Here's the latest tests. Still curious about the 35 deg top angle so that's what I'm working on.
Test 350 is with a new 90/75/60/45/30/15 valve job and Ferrea 30/45 valve.
Test 351 is sinking the intake valve (not the exhaust) around 0.080" and recutting the valve job at 75/60/45/35. A 4mm radius was cut at the top of the 35 deg angle where the 35 meets the shrouded side of the chamber. Same valve.
Test 352 is extending the 35 degree top cut as far as possible with clay. Again, this covers up the spark plug and extends the 35 degree angle more than actually practical - but this is a test. Things can be modified later. Same valve.
Initially, this looks like a bad move for low lift flow, but there are a few things to consider. First, since the exhaust valve has not been sunk, it is very much in the way of intake flow. Also, I think there is a good bit of shrouding in the spark plug area that needs to be addressed.
The flow past 0.25d has increased dramatically. May not be usable for the street or translate to horsepower, but all of this is usable for education.