[sharoncr_17]

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[ajay99]

Originally Posted by thebulletboy

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.

[thebulletboy]

Originally Posted by ajay99

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.

[ajay99]

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.