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Old 03-17-2009, 04:29 PM
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Opinions Please...

Heres my plan: I have a 400 sbc 511 4 bolt block with the stock crank and rods. I'm going 30 over and plan to use Lunati's Voodoo series solid flat tappet #60143,

Int Exh
Adv duration 296 306
Duration @ .050 257 265
Lift .560" .580"
LSA 110
ICL 106

with 10.5:1 cr. My ? is do I go with the AFR 195's or 210's? Also going with either, would it be better to go with a dual plane like the RPM air-gap, or a single like the victor jr. Topped off by a holley 850 dp.

It's going into a 73 Nova with a 4 speed and 4.10 10 bolt. It's a street car with an occasional strip pass. I think with the right set-up, I should be in the 11's. I just have to get it to hook up.

Thanks in advance for all words of wisdom, Joe

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Old 03-17-2009, 04:43 PM
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IMO the cam is too big for that low of compression and stock crank and rods! Too much e/i split as well.
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Old 03-17-2009, 06:14 PM
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I think you would be in the 11's too. However in my expeience stock rods and cranks in a 400 sbc don't hold up to a lot of rpm for real long. I try to keep my stock bottom end stuff under 6,000 rpm. That would lead me to a smaller cam and a good dual plane intake.
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Old 03-17-2009, 09:10 PM
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Smitty-

AP is correct here... 'go a cam or two up' the page and look for a single pattern cam- which I don't think the Voodoo line has but other Lunati grind familys do. The AFR's have impressive I/E % so you would be better served power wise with a single pattern cam.
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Old 03-18-2009, 05:45 AM
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I agree, the cam is way too big for street duty, it would lack low end torque and you`d hate it. The short rods don`t like high revs and will come unglued. Secondary issue is the rods are so short the rod to stroke ratio is so low the piston out runs the flame front at upper RPM`s. If you plan to keep the stock bottom end at least up grade the rod bolts to ARP`s.
If it were I, I would lower the compression ratio to the upper 9`s, get a smaller street friendly single pattern cam somewhere in the 230 degree @.050 range, a dual plane intake, and the 195 runner heads. Focus on what a 400 does best which is make alot of torque. Torque is what moves the vehicle, not horsepower. Torque is what shreds tires. Torque is what makes light cars like the nova a blast to drive.
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Old 03-18-2009, 02:24 PM
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I think Double Vision hit the nail on the (AFR) head. A cam in the mid 230s, and maybe use 1.6 rockers. Remember the AFRs have an I/E ratio that almost wants a cam with greater INTAKE than exhaust duration. Try it on some of the Computer dyno simulators. Consider a single pattern hydraulic roller. I think that'll get you wherever you're going PDQ.

Pat
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Old 03-18-2009, 02:40 PM
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Thnx for the tips. I already have the air gap and carb. Any specific cam suggestions? I originally thought of going with the edelbrock rpm heads and cam package but I thought I was leaving alot left to be desired. I thought the 170 runners of the rpm's would be a bit inadequate. 195 or 210's and a bigger cam might be better to get me where I'm looking to be.
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Old 03-18-2009, 02:59 PM
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air gaps are a pain to drive in cold climates. slow warm up on the carb leads to bad stumbles off idle. even 50F days causes issues. takes 30 minutes of driving to get good throttle response. I would use the regular RPM intake and get a set of heads with exhaust cross over for a street car.

you can get around 500hp/500 ftlbs with a set of afr's and a cam in the 230 degree range with a 406.

do a web search "impersonator II and chevy high performance"

here you go.

http://www.chevyhiperformance.com/te...ild/index.html
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Old 03-18-2009, 11:21 PM
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I had no idea about the temp problems with the air gap.
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