600 or 750
12-25-2007, 10:40 PM
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Car: 86' Firebird
Engine: 2.8L V6 fuel-injected
600 or 750
got a 350 n wonderin if i should put a 600 or 750 carb on it..which will have better performance?
12-25-2007, 10:55 PM
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Car: '88 Iroc
Engine: Single turbo Vortec 5.7, Megasquirt
Transmission: Probuilt 700r4 3000 stall Vigilante
Axle/Gears: Moser 9" 3.25 w/True Trac
Re: 600 or 750
Depends on a lot of things. More engine info is needed. Stock? If not what heads, intake, cam, exhaust, etc.
12-25-2007, 10:59 PM
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Car: 86' Firebird
Engine: 2.8L V6 fuel-injected
Re: 600 or 750
its a stock 260 horse goodwrench 350 my buddy just posted it in tech general engine reapir then i made my name cause i just got my car hes right next to me he says the only thing thats not stock about it is that it has a weiand dual plane intake on top of it...
12-25-2007, 11:04 PM
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Car: '88 Iroc
Engine: Single turbo Vortec 5.7, Megasquirt
Transmission: Probuilt 700r4 3000 stall Vigilante
Axle/Gears: Moser 9" 3.25 w/True Trac
Re: 600 or 750
I would go with a 600cfm. It will be plenty. Even with a 330 hp crate engine they recommend a 650. I have a 600 and am happy with it.
12-26-2007, 02:00 AM
#6
Re: 600 or 750
650 double pumper would be nice on there and give you some room to grow, I wouldn't buy a 600 when the 650 isn't much price difference. For a performance minded thinking skip the vacuum secondary and stick with double pumper. I'm sure at swap meets, etc you could find a used one easily enough.
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12-26-2007, 10:08 AM
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Car: Yes
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Re: 600 or 750
Use the smaller carb.
You have an exact duplicate of a 165 HP mid-70s smooger motor, from the deep depths of the ultimate anti-performance smogger era. With the cam that's in it (the 929.... .390"/.410", 194°/204° @ .050" more or less) it will NEVER EVER draw in 600 CFM of air, let alone any more than that. Just to give you a reference point, Comp "rates" its copy of it for use from 600 to 4800 RPM. At 4800 RPM, a 350 with 90% volumetric efficiency will use about 435-440 CFM. And I doubt that motor can even do 90% VE, so its actual air flow requirement is probably even less than that.
You have an exact duplicate of a 165 HP mid-70s smooger motor, from the deep depths of the ultimate anti-performance smogger era. With the cam that's in it (the 929.... .390"/.410", 194°/204° @ .050" more or less) it will NEVER EVER draw in 600 CFM of air, let alone any more than that. Just to give you a reference point, Comp "rates" its copy of it for use from 600 to 4800 RPM. At 4800 RPM, a 350 with 90% volumetric efficiency will use about 435-440 CFM. And I doubt that motor can even do 90% VE, so its actual air flow requirement is probably even less than that.
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