"There's no such thing as a stupid question--only stupid answers"--unkn
I'm no expert on Weber conversions but I've read...
1) You can't expect to use the vacuum advance on your distributor when
using a Weber. (A shame as it helps economy during cruising)
2) The vent on the rocker cover is an inlet and should be filtered
using a small clamp-on filter like a K&N. In lieu of that, fit a
later 1275cc valve cover with appropriately vented filler cap or I guess
you could plug it maybe.
3) The vent tube or "road draft tube" is designed to pull the blow-by
gasses out of the crankcase and is an early attempt at Positive Crankcase
Ventilation (PCV). A slight negative pressure is necessary on the
crankcase of any A-series motor to prevent oil from seeping out the
rear main seal. Alternatives to the draft tube are either a gulp valve
fitted to the intake manifold like the '67 models used or dragracers
often plumb a rearward angled tube into the header collector to draw
the fumes out of the crankcase (unknown if the latter has been done on
our engines).
Moral: You need PCV in your engine.
Just my opinion,
Shawn
|