Bob Earley wrote:

Paul, can we se a sketch of how the six tubes might match up to the

throttle body? I'm going to start taking apart my newly acquired '88 NA
core this weekend. Is the stock intake totally useless for our needs?

Thanks.

Bob

BTW you can use six tubes on a 13B but four work as well as both ports
on the six port end housings suck at the same time.

The stock manifold is very heavy and sticks up way too far.

BTW Tracy is selling six port flanges.

Paul Lamar

Mike Wills wrote:

  I have one of the 6 port flanges to build a manifold from. Been looking
at this and discussing with the guy who does my welding. We are both coming
to the conclusion that it will be far easier and cheaper to use the stock
Mazda 6 port lower manifold so that you dont have to hassle with reshaping
the end of a round mandrel bent tube to match the port shape in the side
housing. The holes in the top of the stock lower piece are round and its
easy to build a new upper manifold from here using 90 degree mandrel bends.
After a couple of hours with a die grinder removing unnecessary casting
material, water jackets, exhaust passages, etc... you can shave the stock
lower down to a pound or 2 (I havent weighed it yet but its pretty light).

   Ref this picture that appeared on here a year or 2 ago. Note that a lot
more material could be removed from the lower manifold but this shows the
concept.

Mike Wills

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