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Old 10-20-2012, 01:35 PM
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Advice needed: Best Carb set up for 454/450HP engine

I've got a 454/450HP Chevy Engine in my 66 Chevelle SS (it's a street car)

Currently it has a single 4 barrel

I'm looking to add more power, what would you recommend:
A. bigger 4 barrel
B. 3 Deuces
C. Dual Quads

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Old 10-20-2012, 02:49 PM
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What 4bbl are you using now.....I believe the 70 LS6 came from the factory with a Holley 780. I bought a crate engine from GM in 1975 and put a 1050 3bbl Holley on it....worked well
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Old 10-20-2012, 03:07 PM
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The new Edelbrock Performer RPM Dual quad air gap with dual AFB's will work well.
May not fit well under the stock hood. Check for clearance.

A 850-950 or 1000 cfm Holley 4150 will step up the program on a dual plane hi rise .
So will a Comp mechanical street roller cam 11-771-8 or 11-772-8
will really step up that motor.
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Old 10-20-2012, 05:02 PM
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Quote:
Originally Posted by tomhess View Post
I've got a 454/450HP Chevy Engine in my 66 Chevelle SS (it's a street car)

Currently it has a single 4 barrel

I'm looking to add more power, what would you recommend:
A. bigger 4 barrel
B. 3 Deuces
C. Dual Quads
If you want more performance, go w/a single 4-barrel. If you have a Holley carb on it now, get the number off the airhorn and see what size it is unless you are sure you know what it is already. If its an Edelbrock, the number is stamped on the base. Other carbs just ask.

It can matter what gears are in it, stick or auto, how you use it, etc. but a popular carb for a mild BBC on the street is the Holley 3310 750 vacuum secondary if you're using a dual plane intake.

You might need to recurve the distributor as well. Chances are you will get more from that than a carb swap unless you're running a way too small (or too large) carb.

Any real power gains will come from compression and camshaft along w/headers and possibly a different intake, depending on what you now have.
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Old 10-20-2012, 08:04 PM
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A 750 cfm carb is adequate for 450 hp.Changing just the carb wont add much in the way of hp
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