I'm assuming your 660's are the mechanical secondaries with the center squirters. That is what I have on my 460 and love them. The only thing I'm going to do over the Winter is to mill off the air horns. Should help out the air flow to the primaries.

I did not think you could put a 460 in our cars, maybe just my car...lol. Hmmm, I wonder. I saw a nice 521 based on a 460 block, but I did not think it would fit!

They fit !!! With two vacuum secondary 600's.

http://www.clubcobra.com/photopost/d..._Quad_back.jpg

Not that I would want to show any age here, but:

(Max rpm X cubic inches)/3456 = max CFM at WOT.

Give it a try and add a few percent rounding the CFM up.

Just my $0.02 worth.

:D :D

Very Very nice Tony, would you be able to pull the motor without removing the body?

dave...thats a good question !!!!

I run dual mechanical 600s. No problems. I had to jet down from the setup coming from the engine builder in addition to putting on K&Ns.

You can pull the motor, but not the heads if you have non-removable studs. You might be able to if you jack the motor up a couple inches, but I'm not sure.

Still looking for those air cleaner tops,anybody have a source?

69boss, I made them, got a water jet company to cut 4 wagon wheels, 2 from plastic and 2 from aluminum. Went online and bought 180 micron stainless steel wire mesh, you can cut it with regular scissors. Drilled,tapped 4 holes and done!. I need to do them over because the water jet guy cut them 7 1/2 instead of 8 inches.........

Silverback51

Thanks for the info on milling the air horns...I will look into that. And yes they are mechanical secondaries.

Tom

Thanks for the info,have you considered making multiple sets,I would be interested in some.
Thanks again,
Dave

I might, a couple of other members ask as well. A retired ford engineer told me 'NO' available air cleaner is any good, as an example, he said look inside after a few hundred miles and you will find dirt!. I figured any dirt that can pass 180 microns will be easily digested with little harm. So far, so good, after 13K hard miles I still don't burn oil......

Since business is a little slow, I'll call the water jet guy next week........

I have a pair of the 600 CFM 1850 Holleys on a tunnel wedge set up. I'm on a quest to get them functioning as a pair of carbs designed for dual carb appication. Thruth , I can't remember ever getting into it long enough to notice if the secondaries ever opened.
I have the Mallory HyVI and have rev limmiter programed for 6,000 to keep everyting from going south. I still like those flow through aircleaner tops.

Tried a few different dual setups, interesting results
 

In a local circle of friends and different cars, we did dual 450s on a 331 stroker Cobra which worked very well with progressive linkage, then dual 450s on a FE 390 which worked okay (could have been better) as it just did not have the same zip as it did with the single HP 750 did, then a set of brand new and finely tuned dual 550s on my friends original R-Code 427 Galaxy. He really likes this setup a lot, with factory pluged up type exhaust and original exhaust manifolds, these 550s do really well on his original 427. On another guys car he had a set of well tuned 600s in a Cobra. I'm just thinking back on all of these configurations trying different stuff and who was happiest. Knowing thisnow, If I were to do a dual setup on my FE it would most definitely be a well tuned/jetted-down/flowed pair of 600s (or so) Holley's, followed by lots of messing and fine tuning of progressive linkage setups and ratios until it was right. Believe it or not, we were able to get (freeway) 18.1mpg out of my friends 331 stroker Cobra and the motor was right at 430hp running the dual 450s. Another friend setup dual 600s on his Cobra with a 410merc FE. It rips, amazingly well. In each of these scenarios what struck me the most is it took a few times to get it right but once it was spot on, it was really fun to drive in every situation except the 390 dual 450 setup which we never got it dialed in. If I had to do it over again, I'd see a really strong carb specialist before running duals again, it could have saved us some time; I think. Trial and error I guess.

I would be interested as well.

Let us know.

Thanks

Silver.