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| 450 CFM Manual Secondary to 600 Holley? https://www.slantsix.org/forum/viewtopic.php?t=26214 |
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| Author: | Rug_Trucker [ Tue Dec 11, 2007 7:19 pm ] |
| Post subject: | 450 CFM Manual Secondary to 600 Holley? |
Just might try and lend a 600 I bought off Craigslist to a friend with a mild slant. He built it and over carbed it. The 450 is a circle track carb. We might try a bunch of carbs for grins and giggles. 600Eddie, 800 Thermoquad I bought the 600 because in the ad it said "390cfm"  I'm pissed! Maybe even a 70 383 AVS Does the vac pot on a Holley work like an air valve on a Carter? Limiting how far the secondaries can open? |
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| Author: | argentina-slantsixer [ Tue Dec 11, 2007 7:37 pm ] |
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I think that with careful tuning and booster improovement a 600 CFM can easily be tailored to work even better than a 390 on a not so mmild slant six build. The key woudl b in the cam and the head porting job. |
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| Author: | DusterIdiot [ Tue Dec 11, 2007 7:42 pm ] |
| Post subject: | No... |
Quote: Does the vac pot on a Holley work like an air valve on a Carter? Limiting how far the secondaries can open?
The spring determines 'when'/at what vaccuum point they start to open...Holley has a chart based on a Chevy 350 at a certain rpm the secondaries will open with what colored spring... The 600 on a stock-ish slant will require the Black (stiffest, a big block will open this one, but not full opening for a 350 chevy), or Brown (opens secondaries at really high rpms...) This will lock out the secondaries thus creating a 'Holley 2 barrel' for use with the smaller engine... (as usual, your gas mileage will not be so good, but the power will be as much as the engine will ever produce)... I think the better choices are the 390/450, the small block TQ, 340 AVS might work OK. Good Luck, and have fun seeing what works!  -D.Idiot |
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| Author: | Rug_Trucker [ Tue Dec 11, 2007 7:46 pm ] |
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He is running 10.3:1 compression, block decked and head shaved. He is a friend of Slantzilla (or is it DSChumers here?) living here in Nashville. I don't know about head porting and valves. MP 6-1 header MSD I just emailed a guy about buying another Buick 340 AFB. I have one disassembled to rebuild right now. Tiny carb! Smaller than the hyperpak. www.mikescuda.net is the car |
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| Author: | volaredon [ Tue Dec 11, 2007 7:58 pm ] |
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Blue, 68 or 9 notchback, right? |
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| Author: | Rug_Trucker [ Tue Dec 11, 2007 7:59 pm ] |
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After looking at the throttle sizes of my stock of 4bbls? The '66 383 AFB I have looks like the same size as the Hyperpak! EDIT: also has 3:91's and 2600 stall |
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| Author: | Rug_Trucker [ Tue Dec 11, 2007 10:48 pm ] |
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Quote: Blue, 68 or 9 notchback, right?
yes
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| Author: | 68barracuda [ Wed Dec 12, 2007 1:47 am ] |
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Did the change down from 450 to 390 this weekend - wow ok the top end suffers a little - but it goes off the mark sideways now  Wife is cheesed off at me - I accidentally left a couple of black stripes down the drive way  I am using the jetting as per Slant six racing manual |
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