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Old 28th December 2013, 22:35   #46
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Default Re: 1970 VW Beetle Restoration - Delivered

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Old 29th December 2013, 10:47   #47
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Default Re: 1970 VW Beetle Restoration - Delivered

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Originally Posted by thebulletboy View Post
On one hand, if this is an original VW made 1200cc dual port, it would be surprising to note that VW continued to use the same D-series numbers even for the dual port 1200.

On the other hand, I suppose we could assume that this is a local swap with a 1300cc dual port head.
However, I do not think heads for the 1200 and 1300 are directly interchangable. I have'nt ever tried this!

I welcome your opinions on this. I must admit, it has me quite flummoxed!

Attachment 1183881
Attachment 1183882
You can interchange the 1200 heads with a 1300 head,but you would have to change the head studs with the correct 193mm length studs. This is in all probability some locally done modification wirh a 1300 cc dual port head.
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Old 29th December 2013, 11:02   #48
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Default Re: 1970 VW Beetle Restoration - Delivered

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Originally Posted by ajay99 View Post
This is in all probability some locally done modification wirh a 1300 cc dual port head.
Considering that the stroke of a 1200cc is 64mm and a 1300cc is 69mm, one would also have to reduce the length of the inlet manifold by 10mm (5mm on each side). Since the dual port manifold is a 3-piece design with boots for sealing, I suppose this would not be too complicated.

Also the upper cylinder tin would need to be modified.

Seems like an awful lot of work for the 4-5 extra horses !!

But I suppose it's possible.
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Old 29th December 2013, 12:17   #49
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Default Re: 1970 VW Beetle Restoration - Delivered

Here is some more info .The 1300 heads are quite similar to the 1200 heads introduced a few months into the 1965 model year which are much inproved over the previous "round boss' heads, and required longer upper cylinder head studs.
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