650 or 750 carb

[eight r]

10.5:1 358 spec motor 570 hp. what carb should you run?

[Brian Gray]

Either . the 650 will come out of the hole a little better . but ultimate ly which ever helps the over all feel better for you.

[Brian Gray]

The 358 I run I have been as far as 1.75 on the Venturi's it is really what ever you need.

[Brian Gray]

On The NASCAR stuff usually an 830 is what we used

[hucktyson]

Surely you mean 1.75 baseplate not Venturi ...you should have around a 1.400 Venturi carb for a spec motor.

[Matt49]

10.5:1 358 spec motor 570 hp. what carb should you run?

If you're just planning on picking up an off the shelf 650 or 750, I say it really doesn't matter as neither will perform well without proper metering, jetting, and dialing in for your fuel type, cam, and car weight.
Getting hooked up with a knowledgeable carb guy is money well spent. Every engine and weight combination has its own unique fuel curve demands and an off-the-shelf carb will rarely suite a racing application.
But if you are going to go with off the shelf, the 650 would be "better". Unless you're going to turn that motor crazy high RPMs and/or run on big wide open race tracks, you'll never need the 750 and it will hurt bottom end.

[FlatTire]

I don't see that Willy's even offers a 650. All there stuff is 750 or 850.

[Brian Gray]

I had a 1.75 Venturi on my 358 at eldora huck . Yes Venturi . It does kill it on the low end but I was having to rev that motor to the moon.

She would run out half way down the back stretch with the 1.55

[hucktyson]

Your talking out of your a$$ again a carb that size is useless in dirt oval racing. You would use such a carb drag racing with a 7k stahl convertor. I had a 1.59 braswell 4 circuit on a 430 and it was worthless below 4000rpm and when it finally went if would blow the tires off the car . You can't correctly control the power when the carb isn't responsive . KB sold me a 1.410 and the car was a rocket on starts and 10 times more drive able . Maybe the 1.75 carb is why you looped it all alone and took out the leaders ... Honestly dude claiming to need a 1.75 on a 358
Is one of the dumbest things you have said. I understand a 430 will pull nice fuel through the carb than the 358 but if the 1.59was WAY too big for a 430 a 1.75 is sure as hell too big for your 358

[Brian Gray]

I didn't say you need it . I'm saying don't let the numbers get in the way. Give it what it wants.

[Brian Gray]

I didn't loop it all alone birky nailed me as I was pulling off and what you seen was the aftermath

[Brian Gray]

And for the record since my issue was feeding a 358 steel block with a carb way too big. What's your excuse . Did cornet build you an overpriced turd?

[hucktyson]

No my motor is perfect , unfortunately it's a small part of the equation . I finally had the car decent in the b on Saturday and got taken out in turn 4 on lap 1. Don't worry I'll be back this year. The dyno may say a 1.75 is great on a 358 but a race track doesn't and we don't race dynos.

[Brian Gray]

Very true. Stay classy huck !