Hi, I'm trying to find out what carb CFM for my slant six,, Its Bored .060 over ARIAS pistons, head shaved .100, ported and polished with bigger valves, .600 lift camshaft and roller rockers,, Thanks i really need some help,, I'm going to buy a carb this weekend!!! This is only a drag car. thanks,, Pete

pab340@hotmail.com

I know of one racer that uses the 750 cfm on his car and it responds very well. His setup is a lot like yours and i thank the 750 would work fine. But as always it is better to under carg a bit than to go overboard. Thanks Ron

rpracing@catt.com

Pete I had a engine that was pretty close to yours but mine was bored .100 over. I ran this carb with vaccume secondaires. Right now I am using three 350 Holley two barrel carb's. Can't remember the formula for conversion but this comb runs really good.



damuel@kalama.com

sledge, I guess the better question is what is the motor going in? Weight, trans type, rear gears?

slantzilla@excite.com

There is not really enough info. here to make an accurate guess. I would personally start-off smaller for this brand new combo, especially if you do not have a lot of carb tuning experence.

So lets see... here the latest Summit catolog,
a Carter 600 cfm at $199.00, an Edelbrock 500 or 600 for $216.00 and here is a Holley 450 cfm for $175.00, now that's pretty cheap for a brand new vacuum secondary 4 bbl carb.
DD

It's going in a 69 dart, Weight 2850, 904 with reverse manual valvebody, 456 gears,,Thanks again, Pete

pab340@hotmail.com

750 isnt to big ive got a 650 holly on mine and its practically stock its a lil over carbed but im just gonna de jet it

" Right now I am using three 350 Holley two barrel carb's. "
Wow! I'd really like to see pics of that!

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"Ja, Ich fahre ein altes auto."
'78 Volare 225
'67 Charger 318

And then there is twisted6 on the inliners board that has a sheet metal tunnel ram with 3 holley 4bbls on a 250 chev. So size is relative.

Here is Holley's formula:

CI * Max RPM / 3456

So, 225 ci at 6000 rpm gives you:

225 * 6000 /3456 = 390.625

At .060 over you get about 404.

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Chuck Rivers, Webmaster