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?

_________________
'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

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.

_________________
Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

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

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

_________________
'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

Blue, 68 or 9 notchback, right?

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

_________________
'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

yes

_________________
'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

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

_________________
Regards,
Fanie Gerber
It's never junk, it's just a part you're not currently using

http://www.valiant50.co.za
Just say I own a few Mopars