750 too big? - Team Camaro Tech
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post #1 of 7 (permalink) Old May 1st, 01, 06:01 PM Thread Starter
Join Date: Oct 1999
Posts: 188

Hey guys I just bought a 89 RS (couldn't afford a 1st gen) with t-tops. It was originally fuel injected but it was changed over to a carburated 350. the engine has a 750 holley and i was wondering if it was too big for my setup.
9.5:1 compression
Not sure what kind of heads, but they have been shaved and have had $400 worth of work done to them (3angle port)
edlebrock RPM intake
Dynomax exhaust

is this carb to big?
should a go with a 650?
Tom Ziokowski is offline  
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post #2 of 7 (permalink) Old May 1st, 01, 09:16 PM
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Join Date: Mar 2001
Location: Tucson, AZ, USA
Posts: 122

For the street...the 650 will be the ticket.
The 650 will have mucho better response when properly set-up....
The 750 will work out OK ...but 650 is better.
Is this a 4150???

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post #3 of 7 (permalink) Old May 1st, 01, 09:28 PM
Join Date: Mar 2001
Posts: 650

I have the same thing going on. The 750 just seems to be a bit of overkill, and is sluggish when you plant your foot on it. I am building a 400, and I knew I would be doing this project when I bought the carb, so that is my logic to the purchase, heh.
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post #4 of 7 (permalink) Old May 2nd, 01, 01:35 AM
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,327

If it is a vacuum secondary carb, keep it. One of the nice things about vacuum secondary carbs like the Holley 3310 series is that they size themselves to the motor. At low rpms, the secondaries do not open and the carb is basically a 2bbl. The 750 Holley is probably on a million or so 350's running just great....unless ou have money to throw away on another carb, I would try it first. Now if it is a double pumper, I would change.

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner
1973 Z-28 ..one family car...Brother bought it new in 73
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post #5 of 7 (permalink) Old May 2nd, 01, 02:03 AM Thread Starter
Join Date: Oct 1999
Posts: 188

Thanks guys for all your help. It is a vacuum secondary. I don't know the model number but i will find out. i am going to have to keep the 750 for now because i am BROKE!
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post #6 of 7 (permalink) Old May 3rd, 01, 06:47 AM
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Join Date: Sep 2000
Location: Washington, Michigan USA
Posts: 7,728

The Holley "List Number" is stamped on the front side of the choke air horn - if you post it we can decode it.

'69 Z28 Fathom Green
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post #7 of 7 (permalink) Old May 3rd, 01, 10:28 AM
Join Date: Apr 2001
Posts: 205

i have that exact carb. duel feed, single pump, vac secondaries. the number on the horn says 3310. only mine has 74 jets. i believe the stock jets are a 72.
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