I use what Lee Holmon suggested, SAE 40W. I just happen to like Brad Penn, the green stuff. It's easy to read on the stick
I'm sure Brad Penn- SAE 20/50(it's part
synthetic now) would work fine for your sbf. By the way FIA-ERA; hows the BBF project comming ?
OH! don't forget "Joe Gibbs racing
oil" it's top notch too!