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PostPosted: Fri Mar 26, 2021 10:44 am 
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Parameters - 321 CID. V8 4.125 x 3.00 OR 332 CID 4.030 x 3.25. Inline valve cylinder head only (dammit). Single 750 4 bbl. Car weight (dragster) 1670. 2 speed powerglide

Figure needing a minimum of 620 HP where the tires meet the track. What parts? AFR 220s, aluminum rods 5.4", ??? Easy figure the RPM will be "up there" to get the power figure.

WFT is Comp. C/ED @ 5.00 lbs/CID. Index is 7.91 (5.03 1/8)

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PostPosted: Fri Apr 02, 2021 5:46 am 
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That AFR head would have to be *heavily* ported. Sheet metal intake with two carbs, 14-15:1 compression.

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PostPosted: Fri Apr 02, 2021 6:18 am 
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Can the single carb be worked over any? Or do the venturis have to fit a gauge?
Can you run a 3 speed trans or do the rules dictate a two speed?
I would think a 3 speed would help to get it moving since the powerband would be so narrow.
Personally I would go with the 4.125 x 3.00 combo, especially if you can use a 3 speed. I just think it would work better with the 750 carb. It's still gonna probably want 9000 rpm to make the power needed to run that kind of ET.
Those guys in those comp classes really must hate money :lol: , cuz they spend a ton of it to be competitive.


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PostPosted: Fri Apr 02, 2021 6:59 am 
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I skipped over the single carb rule......

Ugh.

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PostPosted: Mon Apr 05, 2021 1:12 pm 
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LOL, that's why the question. Bar is set pretty high there.

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PostPosted: Mon Apr 05, 2021 1:37 pm 
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A realistic 700 flywheel horsepower is 2.18 hp/ci with 320 cubes.

I can do that with BBF engines, but it's two carbs, sheet metal intake, 9000 rpm, 15:1 compression, etc. Not a cheap deal.

Trying to do it with a SBF with a single carb would be a much worse experience.

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PostPosted: Tue Apr 06, 2021 11:05 am 
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Mental exercise for sure.

Thats what I was thinking - "econo dragster" my eye. With the indexes posted, looks like rather than trying to slip in with a small motor, you'd need a major mill to get there. A/ED is 7.28, B/ED is 7.48, C/ED is 7.93. A/ED is 3.40 lbs/CID, 1350 min, B/ED is 4.00-4.99, same min, C/ED is 5.00+, same min. Canted valves only in A and B. Seems like a damn high bar to hit. At my weight, A/ED would be a 491 CID. B - 417 CID. A&B still limited to one 4 bbl, but it can be any size. C/ED is "OEM 750 max". And you have to do it all on gas - no alcohol.

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PostPosted: Tue Apr 06, 2021 12:58 pm 
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B/ED with a 4.76 index in the 1/8. Man, that would take stout cleveland headed motor to get there.
There used to be a guy that showed up at Farmington with a dragster with a 393 cleveland in it that had old NASCAR C302B heads on it. It would go high 4.90's. You would need a solid two more tenths, and just adding 20 inches aint getting you there.


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PostPosted: Tue Apr 06, 2021 2:09 pm 
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Have to be naturally aspirated?

I don't see how a small block rev'd to 9000 rpm would be considered economical when you have to use high dollar parts with frequent replacement.


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PostPosted: Wed Apr 07, 2021 3:47 pm 
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Yes, no power adders in any of those classes. And everything past C/ED is 6 cylinder or 4 LOL. Try A and B nostalgia dragster - cast iron OEM blocks required.

And yes, my thought was the only way to get there with a small motor was to spin it like a gas turbine. No, I don't have that kind of cubic money LOL. I have to think about eating if I get to ever retire. It's just nuts where some of these class indexes have gone.

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