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2 pc. Engines head studs and through bolts
http://forum.porsche356registry.org/viewtopic.php?f=21&t=45997
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Author:  ignacio vivancos [ Wed May 02, 2018 11:57 pm ]
Post subject:  2 pc. Engines head studs and through bolts

Question for the experts.....are 2 pc and 3 pcs head studs the same or do 2 pcs engines use vw 25/36 hp studs?
Also, when was the through bolt used on 2pc engines? Only supers? Is the same as the later 3 pcs bolt?
Thanks

Author:  mats carlsson [ Thu May 03, 2018 11:59 am ]
Post subject:  Re: 2 pc. Engines head studs and through bolts

Hi Ignacio
No not the same. Not VW.
Thru case bolts, same

Author:  James Davies [ Thu May 03, 2018 12:43 pm ]
Post subject:  Re: 2 pc. Engines head studs and through bolts

As Mats says, head studs on 2-piece case engines are the same as for later 3-piece case Porsche engines. They need to be matched to the Porsche heads. VW heads are very different in size because the different valve layout.

The through case bolts were introduced 5 Feb 1954 for Supers and on 20 June 1954 for normals. This corresponds to to engines:

P-40707
P-50037
P-33189
P-21787

and up.

Of course if an earlier engine was overhauled by the factory or dealership, it was very common to drill the Ø 11mm hole at the top and bottom and install through bolts. So some earlier engines have these through bolts as well.

Author:  ignacio vivancos [ Thu May 03, 2018 9:26 pm ]
Post subject:  Re: 2 pc. Engines head studs and through bolts

thanks!

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