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
Melling High Volume oil pump
Eagle I-beam 5.7 rods
floting .030 over speed pro flat top 4 valve relief hypertonic pistons
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
th 350 tranny
and a 4.10 rear end.
Thanks for all you guy's input!
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.
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??
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.
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.
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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