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Old 06-29-2003, 09:03 PM
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Fueling my 400 sbc

I have a 400 sb 30.0 over a 480 lift cam & 224 duration alum intake (torquer) with a 750 edelbrock is it over carbed with stock heads , also if I get my stock heads Ported & polished would that help my HP ?

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Old 06-29-2003, 10:20 PM
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well sampson that depends

any port and polish will help but you have to have the ability to carry it out past the heads ie headers and a good exhaust. so to answer your question yes. but you need to follow through on it.
Second of all there is a normal equation used to calculate max CFM needed by a motor

goes like this:
CFM = Cubic Inches * Max RPM * Volumetric Effeciency / 3456

sooo you said torker manifold (care of edelbrock catalog VE of 90 -100 percent soo well say 95 for even measure)
Max rpm say 5500 (for good measure)
and cubes at....408'cause of the bore (close enough)

CFM = 408 * 5500 * .95 / 3456
CFM = 616.8402 Cubic Feet Per Minute of Air Flow At Carb

there you go... play with the formula even at maximum values you have lots of room to play with, probly even over carbed look at a 650 and perhaps you'll pick up a tenth or 3 in the quarter.

Hope that helped
Hollywooding :cool
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Old 07-04-2003, 04:06 PM
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sumthin I just thought of

Aren't you scared of a cracked cyl, last I heard boring a 400 was pretty close to the edge of tolerance???

just a last minute thought, maybe i'm just paranoid, anyway

Hollywooding
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Old 07-05-2003, 06:46 AM
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400's are safe at .030 or .040 oversize, lots of .060's going strong also.
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Old 07-07-2003, 07:44 AM
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OK I'll go with paranoid then.
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Old 07-07-2003, 09:53 AM
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I don't like that formula, or any formula for carb size for that matter. A 650 will work fine for a 400 but everybody who has ever raced anything knows that you will make more power with a 750. Tuning is the major issue some seem to have. It's easier to tune a carb that's slightly to small than to tune one for most power. Learn to tune and you could even use a 850 on the 400 without loss of low speed torque.
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