Big Block Chevy Head Bolt Markings

[SuperNovaSS]

Does anyone know which head bolts markings are correct for 60's-early 70's Big Block Chevy engines. I have a customer looking for a set of head bolts for a 67 Camaro he is putting together and I am not sure which bolts are correct. I have looked at used sets I have bagged up that I have pulled off 1970 and earlier BBCs and they look to have a mixture of the markings of the NOS bolts he is looking at(pictured below). Are any or all of these marking correct?


Thanks,

Jason <<GRAEMLIN_URL>>/youguysrock.gif

http://i179.photobucket.com/albums/w301/super-novass/HeadBolts001_zps85d20f95.jpg

http://i179.photobucket.com/albums/w301/super-novass/HeadBolts002_zps0086f41a.jpg


http://i179.photobucket.com/albums/w301/super-novass/HeadBolts003_zps8156e0d3.jpg

http://i179.photobucket.com/albums/w301/super-novass/HeadBolts004_zpsced6ad37.jpg

[69 Post Sedan]

Jason, the &quot;M&quot; on the head is correct for those years and the most desireable, at least that's what I've learned from my experience.

Kurt

[SuperNovaSS]

Kurt,


Thanks for the reply. I wonder why the M marked one is most desirable? Mot sets I have taken off of actual engines have the X/+ marking but a variety of symbols.


Thanks again,

Jason

[jasonL78]

I have a set from a 68 396 I would sell.

Pm me if interested.