Victor Laury wrote:
>
> Roadsterites,
>
> I recently purchased a used SU set with manifold and air cleaner from Dave
> Murphy. I sent the carbs and hardware off to Scott of Ztherapy to perform
> his restoration magic. I took the manifold to a local shop that blasts whole
> car bodies with plastic media and now I have this beautiful, clean manifold.
>
> Does anybody know if there is an advantage to spending some time smoothing
> the passages and porting them to match the blocks?
If you are building a race engine yes. See Fred's post.
For street, go polish a bumper instead.
Remember, during street use, even agressive driving, the SU damper piston
is down or mid position somewhere most all of the time (a variable venturi
design which helps give good throttle response) i.e the intake path is
restricted significantly by design. Unless your engine is going to spend
80-100% of the time over 5000 rpms you are just spinning your die grinder...
FWIW
Jim Tyler
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