Thread: MS or VS carb for me?

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I have a CSB 350 stock, one piece rear main seal, Air gap square bore intake, headers, T56 manual trans, Car is a '34 Roadster, Jaguar rear 3,54:1. Tires are 295/50-16.

Planned upgrades for the engine will be Vortec heads modified for higher lift and a new cam of course.

Would like to have a carb that can be used both on the near stock engine of today and later when it is modified.

I've heard that mechanical secondary carburetors are recommended when the car is not too heavy and has a manual trans. Why is that?

I think your set up 350 T5 3.54 rear Light street rod . You could go with a 700 CFM Holley D/P . If you wanted to run the car at the track alot . But for a good street Holley carb I would run the 670 CFM V/S Avenger . But my first carburetor pick would be . The Edelbrock Thunder series AVS 650 CFM adj V/S carb . I have always had good Luck with the Carter AFB-AVS Remake carburetors . I do think what ever Brand you go with the V/S under 750 CFM is the way to go .

Thanks.
But why do most recommend mechanical secondary carb for engines with manual transmissions?

I use mechanical secondaries with a 4 speed light car cuz I like the secondaries to come on when I want them and don't want to have to wait for the vacuum signal to open them.... Just the old circle burner/throttle control stuff coming out in me, I guess..

Carb selection would also depend on your driving style, I like going fast and good handling. Both seem to be easier to achieve with the manual trans/mechanical secondary combination.... If your just going cruisin' and travelling, the vacuum secondary will do just fine....

Originally Posted by staleg

Thanks.
But why do most recommend mechanical secondary carb for engines with manual transmissions?

It's not your manual trans . It's the 355 gear and the street driving . You will have a smoother throttle response . And better MPG with the V/S carb . But yes for all out racing the D/P will be better .