Speedmaster heads for SBM

I had the opportunity to do some flow testing on a set of small block Mopar class heads years ago. It wasn’t that they flowed extremely well but what they did do was get to their max flow number and stay there. When that head should have crashed it didn’t. My friend asked if I could do a valve job to it and I told him no, the valve job I use would ruin that head. I told him those guys spend crazy amounts of money to come up with non conventional valve seat angles that work for that application. It’s top secret stuff that is seldom talked about because this work makes them a reputation and lots of money. Go on Godsons website and with all the cutters available you won’t find an on the shelf super stock seat cutter. They will make you what you want if you fill out an order form but it’s not available to just anyone.