carb question

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jeremy79bu

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Discussion starter · #1 · Oct 26, 2008

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350 bored .040 over, comp 270h cam, stock vortec heads, gm performance dual plane intake, long tube headers, 200-4r o.d. trans, 3.42 posi rear. Is a holley 600 carb big enough for my combo? It will be just a nice cruiser, maybe 1/4 mile race once a year or something.

Also there isn't a port on the back of the carb for my power brake line, where do I hook up my power brakes? thanks

 

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Dave427

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#2 · Oct 26, 2008

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Yes a 600 is perfect. Does your intake have an extra port?

Dave

 

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jeremy79bu

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Discussion starter · #3 · Oct 26, 2008

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just the port behind the carburetor, nothing is hooked up to it.

 

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Dave427

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#4 · Oct 26, 2008

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The one large 3/8 hose port on the Holley is for your pcv valve. Most intakes have another port or plug you could ude for your power brakes.

Dave

 

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SWHEATON

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#5 · Oct 26, 2008

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600 holley is fine for your setup but i would prefer a tweaked q-jet for best perf & fuel mileage if setup correctly.

Scott

 

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jeremy79bu

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Discussion starter · #6 · Oct 27, 2008

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I like quadrajets too but my intake manifold is a squarbore and I dont want to use an adapter. This will actually be my first experience with a holley.

 

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350chev

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#7 · Oct 27, 2008

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Good luck with the Holley... I had a 4150 HP series 600cfm Holley and that thing was a dog. It required constant tuning and the lean backfire was horrendous on my mild 350.

 

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SWHEATON

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#8 · Oct 27, 2008 (Edited)

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Alex,i didn want to rain in his parade if he already had the carb but since you did (LOL!!!!) i have to say i agree with you that the cheapo entrance lvl (1850 ?) 600cfm holley vac sec carb is not a very good carb IMHO if thats the one he has.

But a 600cfm carb of another choice would be fine for his setup but i still prefer a properly setup q-jet for his mild street autotrans setup.

Scott

 

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jeremy79bu

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Discussion starter · #9 · Oct 27, 2008

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I got the carb for $50 and the guy had it on his 66 chevelle with a 396. He let me hear it run with the holley 600 and it ran perfect. He replaced it with a demon carb, I dont know what size.