Need help picking a carb!

CrawlinSlo5.0

New Member
Aug 19, 2009
20
0
0
Lansing, IL
So heres my first post. I was referred to the site by stripped88hatch or something along the lines of that. I cant remember his name on here to save my life.

So heres my question. I need a new carb for my car and im not sure what to go with. The carb on my mustang is a holley 650dp with mechanical secondaries and no choke. The base plate is cracked and some jackass jbwelded it and i just now noticed it.

Im not sure what kinda carb to go with but heres my setup

302
Holley 650dp
Weiand Stealth Single Plane Intake
GT40P's decked 30thousandths and ported and polished
Roller Rockers. Not sure of the ratio as i bought it like this.
X-Cam
Full length longtubes
Mac pro chamber
Flowmasters to dumps
Aluminum Driveshaft
4.10's
FRPP wires
MSD 6AL
MSD Blaster coil

I was told a 650 is to much for the car and go with a 600. I was looking at holleys but theres alot of them with vacum secondaries and i dont want to mess with the electronic choke deal. I was also looking at proform carbs as well. I need something that would be ok for daily driving but can do its job at the track which is very often.

Can someone chime in and help me out here? I dont know anything about tuning carbs either!
 
  • Sponsors(?)


57fairlane

New Member
Apr 2, 2005
560
0
0
Oakwood, GA
a good street-friendly carb? :p

my vote is for a 670 street avenger.

it has vacuum secondaries but still works great on a built up 302.

I had one on a motor I built with ported windsor jrs and a camshaft innovations cam and it made just over 300rwhp . . . a/f was perfect out of the box.
 

TechSteele

New Member
Mar 8, 2009
60
1
0
North Coast
650 should be fine.
Are you haveing problems with it now? (besides the crack)
You can down jet most holley's if needed and adjust just about every aspect of them if needed.
Some you can even just get a new body for them, and transfer the parts from your old one. (easier to get a new one)
I never noticed much difference between the 600's and the 650's myself.
One car did need to be backed off on the 650 because it was flooding, but after a few adjustments and a rebuild kit, it was fine.
I cant say forsure which to get, the 600 will save gas, but you may need the 650 for track use.
If i had to say, get the 650 and some smaller jets to change for daily use.

Tuning them is pretty easy once you learn what the parts do, and what can be done with them. Holley prints several books you can get, and im sure there is PILES of stuff on the net.
 

mattmcdan

Member
Apr 19, 2006
179
0
19
Okeechobee, Florida
I used a Barry Grant Speed Demon 575cfm on my 302, it has many of the same mods you have probably with a touch more. I used to have a Holley 650 and found it to be a bit large for street driving. Also as a rule of thumb mechanical secondaries are generally used on stickshift cars or auto trans cars with larger stall converters, vac secondary carbs are used on street automatics.
 

CrawlinSlo5.0

New Member
Aug 19, 2009
20
0
0
Lansing, IL
man thanks for the awesome responses. Some of the other sites im on i get some really stupid answers. You guys are really helpful.

With the car as it is now i do have problems. When i got to get on it, it spits, kicks and bucks. Then it clears out and starts to pull. I pulled cylinder's 1 &2 plugs and there dead white. The cars running really lean!

So i guess im going to stick with a 650 and im looking for something with mechanical secondaries. My cars a stick so i figure it help out. Its nice to be able to get on it and not have any hesitation.

what do you guys this of proform carbs? Im looking at a 650. Its a holley base with there own base plate and metering blocks.

im also looking at holleys hp series carbs.

Is a barry grant a pretty good carb?
 

joel5.0

New Member
Jun 15, 2004
429
1
0
Puerto Rico
650/750 Holley DP will work fine, my 302 junk has worked for the past 16 years with a 700 Holley DP that also required the jets size to be increased by 3. Another great option you could also check is Pro-Systems, provide Patrick with your setup info, and he'll build you the correct carburetor based on your needs/expectations..... just a thought.
 
Thread starter Similar threads Forum Replies Date
Blueharry Need Help picking a New springs and shock! 1996 - 2004 SN95 Mustang -General/Talk- 0
Rynb15 Picked up an 85gt, need help with year of motor in car/firing order 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 4
Bion1985 SN95 Need Help Picking Wheel Spacer Size 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
At1Maverick69 Need help picking Special Production 2
TwoToneHatch Need Help Picking Out Springs! Fox 5.0 Mustang Tech 3
M Need help picking a clutch Fox 5.0 Mustang Tech 1
MY 85 GT Need help picking an amp? Mustang Sound & Shine All 6
P Need Help Picking Long Block Classic Mustang Specific Tech 16
89hatchlx Need help with picking aluminum or steel?? Fox 5.0 Mustang Tech 16
B Need help picking out hood 1996 - 2004 SN95 Mustang -General/Talk- 35
glowstang93 Need help picking plates for DD 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 5
StreetDreamsGT Need help picking cylinder heads, can't find MM&FF comparison I searched Fox 5.0 Mustang Tech 18
T need some help picking valve covers 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 0
GTA_V6_Mustang Need help on picking a cam 1994 - 1995 Specific Tech 18
howiefisher BUYING ROCKER ARMS NEED HELP PICKING 1994 - 1995 Specific Tech 10
LaserSVT Need help in picking shocks 1996 - 2004 SN95 Mustang -General/Talk- 8
S i need help picking a cam!!!! Fox 5.0 Mustang Tech 11
Y need help picking a mustang 1996 - 2004 SN95 Mustang -General/Talk- 14
Pliskin Need Help Picking! 2005 - 2014 S-197 Mustang -General/Talk- 23
D need help picking out C4 tranny Classic Mustang Specific Tech 26
L need help picking out springs Fox 5.0 Mustang Tech 26
LS-what? Need help picking right tires 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 12
chucks1967 need help picking a carb and intake combo 1965 - 1973 Classic Mustangs -General/Talk- 3
yellowstang1994 Need help picking out Saleen wheels! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 8
B Need help picking tranny fluids SN95 V6 Mustang Tech 14
C Really need help picking U/L Control arms! Fox 5.0 Mustang Tech 8
F Need help picking a computer reprogrammer SN95 4.6L Mustang Tech 2
TheFleshRocket Just bought an S-Trim--need help picking out supporting hardware. Fox 5.0 Mustang Tech 24
Finn McCool I need help picking my '06 2005 - 2014 S-197 Mustang -General/Talk- 15
J Need help picking out the best subframe connectors SN95 4.6L Mustang Tech 8
Kurt2002 Need Help Picking Mods SN95 4.6L Mustang Tech 9
D Need help picking wheels and slicks SN95 4.6L Mustang Tech 2
0 Need Help with picking out Exhaust.. 2005 - 2009 Specific Tech 35
5LugFoxFanatic Need help picking which engine to put into my 86.... Fox 5.0 Mustang Tech 2
M Need help picking out an alternator. Classic Mustang Specific Tech 5
A need help picking a midpipe SVT Tech Forum 6
nmcgrawj Need help picking a front bumper... 1994 - 1995 Specific Tech 19
L Need some help on picking 4.6 or the 5.0 Fox 5.0 Mustang Tech 6
J Crew Need help picking out 2 race seats! Fox 5.0 Mustang Tech 7
9 need help picking donor car 2.3L (N/A & Turbo) Tech 9
T Need help picking a new tranny..how's the Super Duty World Class t5? Fox 5.0 Mustang Tech 24
dderek Help me pick some nice valve covers! need help with clearance etc. show me yours :) Fox 5.0 Mustang Tech 19
Mike86Stang Need help picking a good OTS cam.. Fox 5.0 Mustang Tech 13
R need help on picking a torque converter... Fox 5.0 Mustang Tech 8
CraigThaCrab Need help Picking Tires! SN95 4.6L Mustang Tech 2
Z Need help picking out cam for 94 cobra(HELP) 1994 - 1995 Specific Tech 3
8 Engine Need help Fox 5.0 Mustang Tech 0
B Engine 1990 5.0L Fox high rpm cutout and loud backfire - Need Help Fox 5.0 Mustang Tech 9
silverlx50 Engine Bringing Charcoal Canister Back, Need Help Fox 5.0 Mustang Tech 4
A Drivetrain I Need Some Flywheel help/knowledge please Fox 5.0 Mustang Tech 7
Similar threads