750 Holley carburettor - 2 questions

[menostig]

Whats the ~2 cm diameter hose that goes into the back (side view) of the carb, right in the middle (plan view) ? Mine flopped about and melted itself a bit on the exhaust manifold.

Is there a recommended book on this carb ?

cheers
Roger.

[Boosted LS1]

It would either be for a pcv breather line from the rocker cover or be a vacuum line for the brake servo. Does it go into the base plate? Is it a thick walled hose or fairly thin?

Good book is Tuning Holley Carburettors by alex wallordy, think that's the gents name. Real Steel in Uxbridge sell a few books on the holley.

Boosted.

[menostig]

Excellent, thank-you. It's not the breather return so therefore it is the servo vacuum and indeed heads off into the pods.

regards
Roger.

[steve_D]

If this pipe is melted closed then maybe this is why your brakes are sticking.

Steve

[Boosted LS1]

steve_D said:

If this pipe is melted closed then maybe this is why your brakes are sticking. Steve

Maybe even glowing Cut the pipe and see if air rushes in.

boosted.

[menostig]

Ha, yes well it only did it for one short drive before I found it. The hose isn't pierced but it is something I'll replace.

cheers
Roger.

[menostig]

I plan to take my Sports to Ultima to bypass the brake servos (remove them from the brake circuit) since they are not required and in fact not advised by AP or Ultima on the AP racing brakes if you have the right master cylinders.

BUT now I wonder can I just disconnect the vacuum feed ? I.e. plug the carb's port but leave the hose open going to the servos. This would prevent the servos getting any assistance and maybe act as if they aren't there ?

Any opinions before I naively go playing with such safety critical systems ?

cheers
Roger.