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-   -   406 sbc Carb size?? (http://www.hotrodders.com/forum/406-sbc-carb-size-223022.html)

farmwalker 08-17-2012 10:41 PM

406 sbc Carb size??
 
Hi I just bult a 406 sbc and Im almost finished. I have a 750 holley and I was wondering if I could go any bigger, and if so what do you recomend??

So far I have...
400 sbc 2 bolt 817 block bored .030 over = 406
Stock crank
Melling High Volume oil pump
Eagle I-beam 5.7 rods
floting .030 over speed pro flat top 4 valve relief hypertonic pistons
11:1 CR
Clevite bearings
Balenced rotating assembly
190 cc aluminum heads 64cc chamber (I know i could have gone bigger but i got a good deal on them)
1.5 roller rockers (Got a good deal on them too!)
Voodoo 60105 Cam and lifters
Lift int/exh .525/.546
Duration @.050 241/249
Weiand Team G intake
1 inch carb spacer
3500 stall
th 350 tranny
and a 4.10 rear end.

Thanks for all you guy's input!

vinniekq2 08-18-2012 01:41 AM

750 is probably fine for that camshaft.If you ever upgrade the cam then an 850 will make a few more MPH in the 1/4. I use a 950 and drive mine on the street,works excellent.I started with a BG 830 demon.

farmwalker 08-18-2012 03:13 AM

The tunnel ram is a little much for me right now. But if I come across one for cheap and I want to try it out what size should the two carbs be??

ap72 08-18-2012 06:58 AM

Quote:

Originally Posted by farmwalker (Post 1583866)
The tunnel ram is a little much for me right now. But if I come across one for cheap and I want to try it out what size should the two carbs be??

I WOULD NOT USE EDELBROCKS on a tunnel ram unless you already had them or they were free. Edelbrock carbs are great street carbs but with unequal venturi and only a single squirter cluster they lead to slightly uneven fuel distribution on a tunnel ram.

You won't find a complete setup cheap unless there's something major wrong with it. For a good used setup expect to pay anywhere from $500-$1000 depending on what it is.

vinniekq2 08-18-2012 09:44 AM

when I used 2 x 4 bbl on my street car, I used 2 x 750s. For some reason people think that you divide 1 four bbl in 1/2 and use 2 small 4 bbls,not true.You would use 2 carbs the same as if you used 1 carb on a single carb manifold( approximately) Tunnel rams come with different plenum sizes same as single plane intakes. If you buy a "cheap" tunnel ram,expect the same performance as buying a cheap single four BBl with an extra carb to add to the confusion.

ap72 08-18-2012 10:37 AM

Quote:

Originally Posted by vinniekq2 (Post 1583885)
when I used 2 x 4 bbl on my street car, I used 2 x 750s. For some reason people think that you divide 1 four bbl in 1/2 and use 2 small 4 bbls,not true.You would use 2 carbs the same as if you used 1 carb on a single carb manifold( approximately) Tunnel rams come with different plenum sizes same as single plane intakes. If you buy a "cheap" tunnel ram,expect the same performance as buying a cheap single four BBl with an extra carb to add to the confusion.

"cheap" has nothing to do with it, it just needs to be properly sized. A used swap meet edelbrock tunnel ram is one of the best tunnel rams for a street car.

Look for long runners with a relatively narrow cross section for a good street tunnel ram (it'll help mid range torque). Short runners with a wider taper are for top end power. A good example of this is comparing a LT1 intake to a TPI intake, the TPI intake produces much higher low end torque and the LT1 intake produces higher peak hp. This is also the primary reason for a dual plane intake- runner length and packaging.


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