Paul here is the manifold to figure additional horse power

Bob O'brian.

That appears to be a side draft Weber 48. Is that correct?
Good carb but the runners are too short for a 7000 RPM
rotary. You need the runners about 18 to 20 inches long.
If you extend the two large tubes that will help. You might
be able to do it with two 180 degree 2 inch OD tubing
bends and still fit it under the cowl. Not perfect but it will
help.

You need to do a little die grinding to match up the  ports
better.

BTW who sells that manifold?

Paul Lamar


paul i will do all the adjustments you suggested i never realized how badly the manifold was aligned  with the ports. iam waiting for catto to get back in country to discuss the prop and see the best way to do that thanks and i will stay in touch

bob O'brian.

I think the easiest way to fix the match  is to start with a new intake gasket.


Paul Lamar


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