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  #16 (permalink)  
Old 09-22-2012, 08:07 PM
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Originally Posted by Daubers View Post
Hey guys, I recently acquired a 67 Nova that was set up for the track, and I am in the process of making it more streetable. It has a Barry Grant 800 Carb on it. Right now the jets in it have been bumped up to I believe 78. I have been searching to find specs on my carb to find what the stock jetting was so I can get them in and have a starting point for tuning, i cannot find anything on the carb at all and i don't have a model #. Below is a pic to help identify. Thanks!
Some info for you that should help you ID the carb: Demon Fuel Systems - Identify Your Demon Carb . A link to more info for as-supplied specs, etc., is here.

Good luck.

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  #17 (permalink)  
Old 09-22-2012, 08:09 PM
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Originally Posted by ap72 View Post
for tuning on the street it is VERY IMPORTANT to tune with the pvcr's for WOT and jets ONLY FOR CRUISE. So many people think the jets are for WOT and they ARE NOT.
For street fine but my competition carbs street or strip have no power valve its blocked and I dought if his B.G. 4779 s3 has one.

Jester
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  #18 (permalink)  
Old 09-22-2012, 08:29 PM
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For street fine but my competition carbs street or strip have no power valve its blocked and I dought if his B.G. 4779 s3 has one.

Jester
all out race carbs don't need them as they are never at part throttle. but eliminating them in any carb that will see a good amount of part throttle is just plain stupid. If anything I'd think people would be trying to add a circut, not eliminating one.
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  #19 (permalink)  
Old 09-22-2012, 08:44 PM
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lots of rear PVs are blocked,even on street cars.
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Old 09-22-2012, 09:02 PM
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Originally Posted by vinniekq2 View Post
lots of rear PVs are blocked,even on street cars.
I still work on many with rear power valves but not as many as I once did You dont see too many 3 stage carbs now.
My last one was an 850 holley marine

Jester
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Old 09-22-2012, 09:12 PM
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Originally Posted by ap72 View Post
all out race carbs don't need them as they are never at part throttle. but eliminating them in any carb that will see a good amount of part throttle is just plain stupid. If anything I'd think people would be trying to add a circut, not eliminating one.

Dont call any one on here stupid boy when I was 27 I had 2 degrees in engineering 3 journeyman's cards and was teaching at Henry Ford collage and served 3 tours in Nam. I can learn from anyone. But my head isnt so high in the clouds that I would call anyone stupid!!!

the statement you made proves my point!

Jester
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Old 09-22-2012, 09:12 PM
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Im going to book some dyno time in the spring and thrash the carb.any ideas to try other than standard jets,air bleeds?
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Old 09-23-2012, 03:15 PM
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Thanks for all the great info and time spent looking for me guys! I did take a few hour drive down today to see the guy I got the car off and he did confirm that the carb was built specificly for this engine ( and got a full truck load of parts that he had in his attic for the car ) So what it comes down to, do you guys think I should keep or replace the carb?
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Old 09-23-2012, 03:32 PM
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Originally Posted by painted jester View Post
Dont call any one on here stupid boy when I was 27 I had 2 degrees in engineering 3 journeyman's cards and was teaching at Henry Ford collage and served 3 tours in Nam. I can learn from anyone. But my head isnt so high in the clouds that I would call anyone stupid!!!

the statement you made proves my point!

Jester
and what does Nam have to do with the part throttle circut on a holley?

Stupid was an overstatement I suppose but its definitely a step in the wrong direction.
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Old 09-23-2012, 03:35 PM
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Daubers,keep that carb for sure.I hope it works well for you
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  #26 (permalink)  
Old 09-23-2012, 03:59 PM
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Street cars absolutely need PV's as do most race cars.
You wouldnt take the mixture rods out of a Qjet or a Carter would you?
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Old 09-23-2012, 04:25 PM
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Originally Posted by painted jester View Post
For street fine but my competition carbs street or strip have no power valve its blocked and I dought if his B.G. 4779 s3 has one.

Jester
You two braineacs should learn to read!!! the statement says "for the street its fine"!!!!! > and "My competition carbs have no power valves"!!!!!!" (The word is COMPATITION)!!!!!! and "I dought if his B.G 4779 stage 3 has one"!!!!!!!!

Now you 2 brains tell me where I told anyone it was ok to run without power valves on the street !!!!

Jester
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Old 09-23-2012, 04:25 PM
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soooo if I am keeping this beast of a carb, what do you guys recommend as a starting point for tuning it street friendly. If its set up right now for upwards of 950 that is going to be too much i think. One thing that I do not understand is how much play I have to change the cfm thru tuning on a carb. Being as it was originally a 750 could I get it closer to there with a jetting change? Forgive my ignorance guys, first time dealing with a carb that I didn't just take out of the box and tune from there, and many thanks! I am learning alot.
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Old 09-23-2012, 04:30 PM
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Originally Posted by lmsport View Post
Street cars absolutely need PV's as do most race cars.
You wouldnt take the mixture rods out of a Qjet or a Carter would you?
Yes I do and then I use them as tooth pics as the Q jet hits the bottom of the garbage can !!!!!!!!


Jester
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  #30 (permalink)  
Old 09-23-2012, 04:33 PM
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Daubers,the size of the carb will not change.It was made bigger by grinding and or machining. That carb will work. I use a 950 on my car and its very nice carb.You might have to change the from metering plate/block back to a stock one with a power valve. The jet sizes "might" have to come down 3 or 4 sizes.This will show when the car is running and you get it hooked up to a sniffer and vacuum guage or get on a chasis dyno. The carb will work/start engine etc,you will just have to work on its street manners
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