• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

The 49 year old factory AVS may not be down for breakfast

Well, I got some time to play with the carb a bit, put it back on & now it seems to be running pretty good. Being able to get at the mixture screws is a good thing. :thumbsup:
 
Yeah getting to those sealed up idle mix can really help,BUT even tho they don't like dirt at all I think I'm going with Holley next time,,so much easier to tune for anything you want to do. When drag racing I was going with a super retarded(?) acc.pump cam because of a 4000rpm stall converter, I didn't need a full flow of gas at off-idle. Holley's are just so much easier most of the time. I NEVER went with a dbl-pumper, didn't need it.
 
I have found that the AVS & AFB carter's have leakage issues at the throttle shaft bores..
 
Along with Q-Jets, Holley's and AutoLite's leaking at the throttle shafts, after about 100,000 miles.

edit: They can be bronze bushed, for a price.
 
yeah most of the " deals " and sales of used carbs ive found over the years 80% of the quadrajunks and the holleys all had worn shafts.
surprisingly,the newer edelbrocks seem to have this same affliction...

the factory probably never imagined we would still be going on our original castings so longevity wasnt really a factor back then,
but the new edelbrocks,whats their excuse?

related thought,
i was reading about mp valve covers defects in the castings today...
theres just no pride in anything anymore.
 
all types of carbs will pass fuel past the throttle shafts if there is excessive fuel laying on the throttle blades. fuel boiling in the bowls is enough to push some gasoline thru the boosters. there's a whole lot more to this than the brand of carb.
 
The reference of worn throttle shafts is not as a fuel leak, but as a vacuum leak that you just can't seem to find. At least Holley started selling replacement baseplates, if they still are doing that.
Fuel boiling is a different issue due to crap gasoline, a heat spacer often helps that problem.
 
You must log in or register to reply here.

Similar threads

Tony 70GTX
Carter AVS 4737 4BBL 1970 440 GTX
Replies
10
Views
1K
RJRENTON
RJRENTON
J
Choke and Manifold Heat Control Valve Questions 70 440HP
Replies
7
Views
993
Jam72
J
O
Carb and intake comparability
Replies
4
Views
672
Geoff 2
G
S
Fine tuning mixture via air filter?
Replies
8
Views
824
Some Car Guy
S
Richard Cranium
William Post won't be down for his Pop Tart breakfast
Replies
17
Views
891
DeltaV
DeltaV
Auto Transport Service
Back
Top