carburetors

thehorse · 01-20-2002, 02:47 AM

what kind of carburetors can i put on a 1967 289 engine that is trapped in a 65 body for both racing and street quality?

Rev · 01-20-2002, 04:55 AM

I recommend either a Holley 4150 with vacuum secondaries 600 cfm or a Road Demon. I've had both. The Holley had a better electric choke than the Demon. Both produced about all that could be expected from my street friendly engine.

I've not had an Edelbrock which I believe is similar to a Carter AFB. Not sure, but I've heard they're not in the same class performance-wise.

Rev

mustangman65_79 · 01-21-2002, 08:48 AM

I wounldn't use a four bbl with vacuum secondaries because the other two bbls will not kick in till higher RPM. They work on vacuum, so that when there is less vacuum, say when u have it wide open at higher RPM, they will open all the way. Mecanical secondaries work when u want them too. The farther u push the pedal, the more they open up. U can smash the pedal at idile, and all will open up right then, not later.

I'm going to put in a new 670CFM Holley in my 289. that might be too much gas for a stock engine. I'm also putting in elec pionts with a 45,000 volt coil and 9mm wires. That should handle all that gas just fine.

Dark Knight · 01-21-2002, 10:25 AM

a 600 holley is probably the best choice... for out of the box all around performance.. and the secondaries do open when you floor it... not just high RPM... you can also get a quick change kit for the secondary spring to have them open when you want...
I have the 80457s, and it works great... ;-)

Rev · 01-21-2002, 08:06 PM

You don't really want the secondaries to open all at once unless you want a huge bog at lower RPM. That's what the vacuum secondaries do, they wait till the engine can handle the extra flow and then they do it proportionally. A spring kit will let you tune that secondary opening earlier or later and faster or slower as needed. That's a great thing about Holley, they're ultimately tunable.

Rev

David Fulford · 01-22-2002, 03:33 PM

I second the holley 600 vac secondaries. That's what I have and it's been really good to me. For the money I don't think you can get a better deal.

01-20-2002, 02:47 AM	#1
thehorse Registered Member Join Date: Jan 2002 Posts: 13	carburetors what kind of carburetors can i put on a 1967 289 engine that is trapped in a 65 body for both racing and street quality?

01-20-2002, 04:55 AM	#2
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	I recommend either a Holley 4150 with vacuum secondaries 600 cfm or a Road Demon. I've had both. The Holley had a better electric choke than the Demon. Both produced about all that could be expected from my street friendly engine. I've not had an Edelbrock which I believe is similar to a Carter AFB. Not sure, but I've heard they're not in the same class performance-wise. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

01-21-2002, 08:48 AM	#3
mustangman65_79 My poor 79 RIP Join Date: Oct 2001 Location: Suisun City, Posts: 2,320	I wounldn't use a four bbl with vacuum secondaries because the other two bbls will not kick in till higher RPM. They work on vacuum, so that when there is less vacuum, say when u have it wide open at higher RPM, they will open all the way. Mecanical secondaries work when u want them too. The farther u push the pedal, the more they open up. U can smash the pedal at idile, and all will open up right then, not later. I'm going to put in a new 670CFM Holley in my 289. that might be too much gas for a stock engine. I'm also putting in elec pionts with a 45,000 volt coil and 9mm wires. That should handle all that gas just fine. __________________ '84 mustang GT turbo '85 LTD '89 Camaro Irocz z28 '94 Lightning '96 Trans am

01-21-2002, 10:25 AM	#4
Dark Knight Registered Member Join Date: Oct 1998 Location: Az Posts: 854	a 600 holley is probably the best choice... for out of the box all around performance.. and the secondaries do open when you floor it... not just high RPM... you can also get a quick change kit for the secondary spring to have them open when you want... I have the 80457s, and it works great... ;-) __________________ 84 convt,roller 302,AFR's, performer 3.55's, underdrives BBK shorties stock cam, 1.7's 13.58@102.84 and a '68 stang .. project 8 sec street car... 557 big block + N20 :-) http://members.cox.net/darkknight302/68nwrear.jpg

01-21-2002, 08:06 PM	#5
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	You don't really want the secondaries to open all at once unless you want a huge bog at lower RPM. That's what the vacuum secondaries do, they wait till the engine can handle the extra flow and then they do it proportionally. A spring kit will let you tune that secondary opening earlier or later and faster or slower as needed. That's a great thing about Holley, they're ultimately tunable. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

01-22-2002, 03:33 PM	#6
David Fulford Registered Member Join Date: Oct 2000 Location: Charlotte NC Posts: 193	I second the holley 600 vac secondaries. That's what I have and it's been really good to me. For the money I don't think you can get a better deal. __________________ 1969 fast back; yellow; weld wheels; 302 roller with GT-40 heads; 3:55 gears; 5spd T-5; MSD 6AL; E-303; flows; Hedman headers; Holley 600;Weiand Accelerator;1.6 rockers