Well, Maurice,
it looks like you may have the right idea! Apparently, there's limited
horizontal space (inner wheel arch) as well, which leaves little room
for a spacer between the carbs and manifold anyway!
Currently looking at modifying the manifold to fit the carbs...
I'll keep the progress posted!
John Donohoe
'70 GT6+ KC 81718
(putting the well worn 150's back on tonight while we solve the
conversion conundrum!)
> Hi John,
>
> When I converted to HD 8's in my 2.5 GT6 I didn't bother with the
> adapter route. If you look at your intake manifold you will notice the
> skinny runners leading up to flange plus the flange itself is not
quite
> big enough to mate with larger carbs.
>
> Any porting with this manifold would have resulted in breaking through
> the manifold's tube wall.
>
> This I solved by getting a welder friend to add gobs of aluminum to
the
> underside of the skinny tubes next to the flange and to fill in all
the
> hollow areas. Then he built up the surface area of the flange's
mating
> surface to accommodate the 4 bolt pattern. He also filled in the old
> carb mounting holes.
>
> At this stage it looked pretty ugly but I took a hand grinder (dremmel
> tool?) to the new aluminum and smoothed it off, then opened up the
> ports and finally had a machine shop resurface the flange and drill
> new carb mounting holes.
>
> End result was an intake manifold that flowed much nicer than an
> adapter mated to a small bore inlet. Total cost $60.
>
> -Maurice
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