Speedmaster heads revisited.
I’m going to add this to the post because I had a customer ask about it after he got his heads back. A friend told him he was going to get to much oil
Up top so I sent him pictures and told him how to fix it. I bought a pack of probably 20 from a eBay seller but lots of places would probably stock 1/4-20 brass set screws. To ease drilling I would double nut them so I could hold them in a Vice and drill them on my drill press. I drilled the ones I did with a 1/16 inch drill bit. I tapped my head under the rocker shaft so I could easily remove it and go bigger or smaller if I wanted to. If I remember right Edelbrock heads were easier to tap but just go slow and easy. A broken tap would not be done. I don’t offer this because by time I buy the set screws how much could you really charge to drill two holes and tap two holes. I’m almost positive I’m not running any but my heads were tapped just in case. I run a tight tolerance on my Harland Sharp rockers.
I’m going to add this to the post because I had a customer ask about it after he got his heads back. A friend told him he was going to get to much oil
Up top so I sent him pictures and told him how to fix it. I bought a pack of probably 20 from a eBay seller but lots of places would probably stock 1/4-20 brass set screws. To ease drilling I would double nut them so I could hold them in a Vice and drill them on my drill press. I drilled the ones I did with a 1/16 inch drill bit. I tapped my head under the rocker shaft so I could easily remove it and go bigger or smaller if I wanted to. If I remember right Edelbrock heads were easier to tap but just go slow and easy. A broken tap would not be done. I don’t offer this because by time I buy the set screws how much could you really charge to drill two holes and tap two holes. I’m almost positive I’m not running any but my heads were tapped just in case. I run a tight tolerance on my Harland Sharp rockers.