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Carb float level

jracer49420

Member
Joined
Dec 6, 2006
Messages
11
Location
hart, mi
Corvette
1974 stingray
I have a 74 that is hard starting when cold. I was told that the float level in the carb should be checked. I have a Q4 on this vette. Can anyone tell me how this is done? Thanks
 

Sensei

Well-known member
Joined
Apr 5, 2004
Messages
393
Location
Jacksonville, Fl
Corvette
'81 dark blue
You have to pull the top of the carb off to set the float level. With the top removed, remove the big phenolic spacer that covers the area around the needle/seat. Hold the float hinge clip firmly seated and push down lightly on the float where it contacts the needle. Measure from the top of the float bowl to the top of the float at the rear edge of the float. Float level should be .375" for a street-driven car using a 1968 – 1974 carb. Adjust the float level by removing the float and bending its lever arm. Never raise the float level by forcing the float against the needle/seat to bend it – this will damage the needle. (From Q-jet tuning by Lars Grimsrud) God bless, Sensei
 

bradfordsvettes

Well-known member
Joined
Mar 28, 2001
Messages
549
Location
Boston, MA area
Corvette
jewel blue 61.cranberry 69 t-top.black rose 92
If you just want to check the level before pulling the carb apart O.T.C. sells measuring sticks that fit down the vent hole and will give you a pretty accurate reading to see if it needs to come apart for repair;) . make sure your choke closes tight and that the pull-off is working .these carbs also had issues with leaky lead plugs in the bottom of the bowl this would leave the bowl dry and let gas run into the engine a bowl at a time if left long enough:ugh Steve
 

glen242

Well-known member
Joined
Aug 30, 2004
Messages
135
Location
Moon Twp. PA
Corvette
1976 Mahogany
If you just want to check the level before pulling the carb apart O.T.C. sells measuring sticks that fit down the vent hole and will give you a pretty accurate reading to see if it needs to come apart for repair;) . make sure your choke closes tight and that the pull-off is working .these carbs also had issues with leaky lead plugs in the bottom of the bowl this would leave the bowl dry and let gas run into the engine a bowl at a time if left long enough:ugh Steve

Tell me more about the O.T.C. measuring sticks. Where do you purchase them?
 

bradfordsvettes

Well-known member
Joined
Mar 28, 2001
Messages
549
Location
Boston, MA area
Corvette
jewel blue 61.cranberry 69 t-top.black rose 92
otc is a tool mfg company some tool vendors cornwell, mac, matco or maybe snap -on may be able to hook you up I hope the kit is still available carbs are not used much anymore but if you hunt around i am sure you could find them maybe even e-bay i will check around it is a handy tool Steve
 

bradfordsvettes

Well-known member
Joined
Mar 28, 2001
Messages
549
Location
Boston, MA area
Corvette
jewel blue 61.cranberry 69 t-top.black rose 92
these are what they look like mabe a hard item to find otc , kent-more,and thexton are a fewof the vendors that had them the part # are in the pics will see if i can round something up on the net Steve
 

glen242

Well-known member
Joined
Aug 30, 2004
Messages
135
Location
Moon Twp. PA
Corvette
1976 Mahogany
All, thanks for the info. Will search for them, but if you have a reliable source, please let me know.

Thanks,
 

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