A 77 shouldn't need a PCV. Originally the carb sucked on the front tappet
chest cover, and a pipe on the back of the rocker cover sucked on the
charcoal canister, and that sucked on the anti-runon valve, and that was
open to atmosphere. If it had been desmogged the canister and anti-run-on
valve, and hence the engine breathing, should have been left untouched as
that only has benefits and no drawbacks. If the canister and valve have
been removed the port on the back of the rocker cover should be sealed and a
vented oil-filler cap fitted. Even with the PCV valve sucking on the rocker
cover (instead of the carb sucking on the tappet chest cover) you still need
somewhere for the air to get in for the through-flow breathing. Unless the
pipe on the tappet cover has been left open (probably not a good idea) the
only thing you could do would be to fit a vented oil filler cap, but then
you would only be purging the rocker cover and not the crankcase. The
factory way really was best.
PaulH.
----- Original Message -----
From: "Bill Miller" <millerb@intergate.com>
To: "MGs" <mgs@autox.team.net>
Sent: Saturday, March 06, 2004 2:05 AM
Subject: RE: Exhaust System and PCV Questions
> I bought a '77 B ...
>
> One this I didn't like was the oil consumption.
>.. This car was desmogged and had no breathing on the top half. What I
> did was put in a modern PCV (from a buick, I think)
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