Thread: bbc head machining blueprint drawings..

Tweet

Hi Guys....I have an old pair of 074 winters aluminum heads...my question is I,m looking to drill and tap the rocker stud holes and install my own type of heli coil-time sert...only I can't find any info on the angles of the holes....basicly the head dimensioning machining drawings...local speed shops not much help at this point...just wondering if theirs a book or drawings on the net somewhere.....thanks in advance

Have you tried any google or Bing searches yet? That's where I'd start, "Winters Cylinder Heads".

you pick the tread hole angle off the old threads or hole with a center pilot pin in the chuck . has alot to do with what machine i used but brigeport or tobin arp but you roll one angle on the tilt table and cant angle off till head. do them all the time on the brigeport on the tobin arp seat and guide machine.i used time screts for thread repair. you can find angles very easy with a 7/16 theaded stud and i shine the 7/16 stud to my quill of my machine intake is 26 cant is 4 ex is 17 and cant around 4 after heads have been around i pick up off of head not so much what they may or may not be on paper i find it.s abetter way to go

Thanks for the reply Pat...I,m a toolmaker so going about it your way should work just fine....you know toolmakers we feel better with prints....lol...going to dig into it in a few weeks , I,ll let you know how it goes..

Originally Posted by just putzing

Thanks for the reply Pat...I,m a toolmaker so going about it your way should work just fine....you know toolmakers we feel better with prints....lol...going to dig into it in a few weeks , I,ll let you know how it goes..

well i am a engine machinist so it works . a blue print... good luck.. after you spend time with the print. you would be shocked were things should be and what production size it shows up at. i use a gm guid plate to pick up studs centers if needed