Yeah that's the same thing everyone else is telling me, Its an old edelbrock, it's pretty beat. lol. I've only got a 3 speed, so the rpms stay decently high all the time, so I think I'll be fine running it for like 100 miles a week for the next month... I'm not to concerned about it, I'll just justify putting my foot down, cuz it runs great all out. 😀
Bad to run to big a carb.
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I have a 355 with approx. 370 hp and I have had a Holley 750 on it for 10 years now and never had a problem with it. I don't think it is too much at all, but with that said, a 650 would not be too little for it either. Just keep in mind what you might want to do to it in the futur and what your fuel needs might be.
Too small of a carburetor can kill it as well. Just because a carburetor is smaller CFM does not mean that you will get better fuel mileage either. CHRIS.O had a 1406 Edelbrock 600cfm on his 455 and then switched to an 800cfm HOLLEY spreadbore and gained a ton of performance along with better fuel economy than the Edelbrock 600cfm provided :idea:
Combination is key :!:
Combination is key :!:
The issue of running a 750 on a mild 350 is more a matter of performance and mileage than danger of hurting the motor.
The venturis on a 750 are sized for an average air flow higher than a mild 350 will generate. The smaller intake runners in the heads cannot produce a large enough demand (air draw through the carb) for the carbs venturi system to work efficiently. Usually the carb ends up "leaking" drops of fuel into the mainfold where a lot of it drops out and puddles on the manifold floor. That's usually where the gas smell comes from.
A 650 will run better but you are still giving up some bottom end response. If you play on the highway, a 650 would be a good choice. If you mostly play from red light to red light a 600 would give you crisp throttle response and be quicker than the other two carbs up to about 5,000 rpm. After that the 600 will start to fall on it's face.
This assumes that the mild 350 is a basically stock engine with mild cam and bolt ons.
The venturis on a 750 are sized for an average air flow higher than a mild 350 will generate. The smaller intake runners in the heads cannot produce a large enough demand (air draw through the carb) for the carbs venturi system to work efficiently. Usually the carb ends up "leaking" drops of fuel into the mainfold where a lot of it drops out and puddles on the manifold floor. That's usually where the gas smell comes from.
A 650 will run better but you are still giving up some bottom end response. If you play on the highway, a 650 would be a good choice. If you mostly play from red light to red light a 600 would give you crisp throttle response and be quicker than the other two carbs up to about 5,000 rpm. After that the 600 will start to fall on it's face.
This assumes that the mild 350 is a basically stock engine with mild cam and bolt ons.
Max Headroom said:
To my knowledge it was a stand build motor, I wish I knew what the block was out of. but I appreciate the input, I'm definately gonna downsize in the future, I just wanted to make sure I wasn't hurting anything in the meantime.
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