Cylinder head screws - exact definition

[Thomba48]

Working on the engine one cylinder head screw broke. Not an issue you think? No it isn't, but now I need a spare one to continue my work :-)

 

What is the exact type definition of this particular screw? Maybe knowing that I can source one directly in Germany.

 

 

thanks

 

 

[Plymouthy Adams]

are you referring to one of the head bolt itself as in 7/16 x 14 thread or are you speaking in terms of the smaller bolt that threads into one of the special head bolts for accessory mounting?  There are also bolts for the thermostat housing and oil filter bracket.....

[Thomba48]

I am talking about the big one - 21 of which are needed. thanks

[Plymouthy Adams]

these are available most any shop stateside, can use small block chevy item if you wish.  Summit will sell a set of 25 new in box for this application for about 25.00 I think it was...make sure they proper grade, undercut so not to seize.  Many like to upgrade to ARP studs at this time and finish off with chrome caps...we just had a good discussion on these less than two weeks ago..a search should reveal the recent posted data

 

 

update....link   

 

Edited January 18, 2018 by Plymouthy Adams

[Thomba48]

7/16 Zoll - 14 x 3 ? Is grade 5 ok?

http://www.zollshop.de/de/Zollschrauben-UNC-Stahl/Sechskantschrauben-Grade-5-7-16-quot-UNC-7-16-14-x-2-50-80-mm-Sechskantschraube-UNC

[Plymouthy Adams]

grade 5 is not good.......you need grade 8 again, be sure the very physical characteristics also match that of stock.....it serves a purpose.....

[Don Coatney]

  On 1/18/2018 at 8:14 PM, Thomba48 said:

7/16 Zoll - 14 x 3 ? Is grade 5 ok?

http://www.zollshop.de/de/Zollschrauben-UNC-Stahl/Sechskantschrauben-Grade-5-7-16-quot-UNC-7-16-14-x-2-50-80-mm-Sechskantschraube-UNC

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Not OK. You need no less than grade 8 and you need an undercut shank as pictured.

[Thomba48]

thanks :-)

[Plymouthy Adams]

did  you  not follow the link, if in doubt check this chart and notice the grade 5 will not meet specs....   

Edited January 18, 2018 by Plymouthy Adams

[jesse harvey]

head bolt

just tell me  how many and where to ship

got many from lots of tear downs

jesse

[Thomba48]

Thanks to you all. As usual I have displayed a certain lack of experience and would have made a big mistake without all your insights. I have found a local resource that I was able to draw from. 

 

Thom

[greg g]

These are for GM Chevy applications nearly exact match.  Cost about $1.00 each.  If not available where you live, ask your parts man or machine shop guy to cross reference the part number. Would think these or a cross over would be available where ever on the planet GM small V 8 engines  are used and sold.

 

 

Below from left new grade 8, center stock head bolt, right, new Pioneer head bolt for Chevy/GM V8

 

[bluefoxamazone]

  On 1/19/2018 at 3:37 PM, Thomba48 said:

Thanks to you all. As usual I have displayed a certain lack of experience and would have made a big mistake without all your insights. I have found a local resource that I was able to draw from. 

 

Thom

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hey Thom, If you want the real deal, start checking for companies that sell parts for Dodge WC parts (for the old army trucks) There are a few of them in Holland and Gemany too I guess. This is a very important bolt...  grtz  Franky Belgium

[Thomba48]

Thanks and best greetings to Belgium. How are you getting along? 

[Thomba48]

  On 1/19/2018 at 5:51 PM, bluefoxamazone said:

hey Thom, If you want the real deal, start checking for companies that sell parts for Dodge WC parts (for the old army trucks) There are a few of them in Holland and Gemany too I guess. This is a very important bolt...  grtz  Franky Belgium

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The bolts would be the same? Thanks