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farmwalker 08-17-2012 09:32 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!

327NUT 08-18-2012 01:40 PM

Saw your question last night, can't believe it hasn't been answered by one of the "experts"......which I am not. Anywho, your spec's sound like this is a pretty hot build but you didn't indicate what it is for....mostly street, street/ strip, strip only, weekender, hopefully not a street racer:nono:

With the smallish heads I think a properly built and jetted 750 would work pretty well. Try that out first, you can always upgrade to larger carb but again it all depends on the application. I'm going to be running a Quick Fuel 780 on my 507" Cadillac, big engine but the rpm limit is around 5,000 so i think it should work. A lot of this stuff is trial and error.....good luck.

327NUT 08-18-2012 01:55 PM

Well now I see why nobody answered your question double posted the same question in the engine section. Double posting is not good, you waste folks time:spank:

farmwalker 08-18-2012 02:03 PM

Im new. I accidently put it in this section and then I couldn't figure how to delete it. Sorry.:smash:

lg1969 08-18-2012 02:24 PM

The 750 CFM carb is plenty for the cam you are using. AT 6700 RPM you are pulling 708 CFM at 90% VE. It's funny that I have the similar setup like yours.

farmwalker 08-18-2012 05:59 PM


Originally Posted by lg1969 (Post 1583943)
The 750 CFM carb is plenty for the cam you are using. AT 6700 RPM you are pulling 708 CFM at 90% VE. It's funny that I have the similar setup like yours.

That's awesome. How's yours run?

lg1969 08-18-2012 08:25 PM

My Tunnel Ram 11:1 406, AFR227 heads, TH350, 3500 stall converter with a shift kit and 410 gears, it is hair raising and a frame twister.

eloc431962 08-19-2012 06:06 AM

You should be able to go up to a 850 and be ok with the build you have JMO
i'm running a Holley 830 HP om my 408 street driving witout any problems .


lg1969 08-19-2012 10:17 AM

Thanks, But I'm very happy and I'm having a blast with the setup I got. I can feel my head pull back right off idle to 6500 RPM and no flat spot at all.

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