Two different manifolds. The HS2's have the mounting bolts oriented
straight up and down, the HS4's have them at a slant. The throat sizes
under the carburetors are different, though the manifold runners are
identical diameter.
Remember something though about SU's and the 1500. The SU flows quite
freely, up to the full open throttle position. To put it losely, at half
throttle, there isn't diddly difference between the two. The difference is
when wide open & reved up, as in flowing lots of air. So the larger HS4's
will allow the 1500 to rev higher then the HS2's would. Is this a good
thing? Maybe not. After all, the 1500 is just a stroked out 1300; hence
it self destructs more readily when over-reved.
DLancer7676@cs.com wrote:
> Can you just switch the carbs on the same manifold? Or is there an HS2
> manifold and an HS4 manifold?
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