I have a 350 engine, L82 cam, double hump heads...mated to a TH350 and out the rear to a set of 2.73 gears.

Would this 750 cfm be too big for my engine?
http://store.summitracing.com/partdetail.asp?autofilter=1&part=EDL%2D1411&N=700+400065+300513+4294785104+115&autoview=sku

Ive got one of those on a 307, with 194 heads, performer cam and headers, I think the air doors on the secondarys help us folks that buy a carb a little too big, from bogging. You'll probably get opinions that a 600cfm is all you'll need, but if you decide to upgrade your gears or engine size later, its going to save you from having to buy another carb. Only reason I used the 750 on mine was it was a freebie. jim

I agree with what was just said. A 600 will suit your needs better right now, will be more responsive etc. But the 750 with a air valve will be more forgiving if it's too big. Unless that 350 is going to hit the 450 hp mark I think a 600 will be ok.

get the 600. the 750 is too big. also, we have had many members post about driveability and tuning issues on these carbs.

I run a 750 on my 496 on the street.

Get a 750 Holley of your choice.

I don't care what the equations say, my 882-headed 8:1CR 355 ran considerably quicker with an stock 3310 than it did with an 1850 or a 80457.

The 600's were supposedly better suited for the combo but I ran the 80457 over the course of a year, switched to the 3310 and it picked up .25 in the 8th right away and another .15 over the course of a year (and switching the softer secondary spring to the one I used with the 80457). I could feel the difference on the way to the track. The car is a pleasure to drive with the big carb, even the throttle response is more crisp.

Engines don't read books.

I run for a few years with a 650 Double Pump on a 40 over 350, camel heads (1.94). Steath intake. I forget the cam. 350 Turbo, 3.73 gears.
All in a 1970 Gremlin..lol....never had any problems with the carb. Loved that Holley...Car ran low 13's..

Use a Q-jet. They are 750 or 780 cfm but will only allow what the motor is demanding. This carb will grow with you.
Bill

Use a Q-jet. They are 750 or 780 cfm but will only allow what the motor is demanding. This carb will grow with you.
Bill

That's what I'd like to do, but there's a problem.....

The q jet I have uses the heating element on the intake to take the choke off.....a divorced choke I think is what they called it...

My intake doesn't have a provision for this so it's either an electric choke or a manual.

Plus my intake (s) are square bores. You see there's two engine uses in question here.

I was thinking of using this carb on my bbc 402 as of now, and then later taking it off and using it on a 350 I have.....sort of like a "universal" carb so it would justify spending $300

I would run a 600 on the 402 but that would choke performance right?

Or would a 650 be better?

Can you convert a divorced style choke to electric on a q jet?

What about a 600 or a 650dp, they'd prolly be real fun and not use so much gas?

Hey there,

Why not a Holley 770 Street Avenger? That is what is on my small block 350, no issues at all, and crisp throttle response. And it is big enough for the bbc and comes with electric choke.

Look at me my car goes faster because I slapped a 1000 CFM dominator on my 350...WRONG!!! I'd go with a 600 or 650 with vacuum secondaries. Even if you do a little upgrading a 650 should be plenty for the street regardless.

You can run a 750 cfm but I think it would a bit much, I think a 600cfm would be better for your cam and such. I have been using Demon carbs for some time now, got tired of the constant adjustments on Holleys. Look into a Speed Demon 600cfm for your needs. Check Jegs out for this, hard to beat there prices.

BIG-C

I was thinking of using this carb on my bbc 402 as of now, and then later taking it off and using it on a 350 I have.....sort of like a "universal" carb so it would justify spending $300



Look at me my car goes faster because I slapped a 1000 CFM dominator on my 350...WRONG!!! I'd go with a 600 or 650 with vacuum secondaries. Even if you do a little upgrading a 650 should be plenty for the street regardless.

LOL... A little over the top analogy, but honestly, a 750-770 is what would work out for what he is trying to do and his current setups. I guess you missed that...

Hey there,

Why not a Holley 770 Street Avenger? That is what is on my small block 350, no issues at all, and crisp throttle response. And it is big enough for the bbc and comes with electric choke.

Already have one, not that impressed with it, looks like you pay more for a marketing ploy...

Plus one of the reasons was because I wanted to make the car more streetable, Holleys seem to be set up to run pig rich at the factory no matter how well the timing is set and how lean you set the carb.

Jetblue I'd never even consider wasting the $$ for a 1000 cfm carb for a 350...

Dont use the edy,if you must stay sq bore intake use a holley 650 with that mild 350 you have.

750 holley setup correctly will work ok too but its just not needed with your motor.

But as mentioned abovethe q-jet will grow with just about any mild to fairly hot perf motor its bolted too within reason & with a few mods for optimal perf.

Scott

I agree with the Q-jet boys. For your "universal" needs, Its the best option. The Holley's (which are great carbs) just don't have the same versatility. You would have to compromise something. It will either be too big for the 350 or too small for the 402. Remember In some applications, GM used the same Q-jet on the 305 that they used on the 454.