What size carb?

Dave_mustang_50 · 06-03-2005, 10:47 PM

I`m thinking of loosing the 670 cfm carb on the 351C and going with a 750DP. The kicker is i`m not sure what cam is in the car. The guy I bought it from didnt know, but said it was a comp cam 2 above stock. I`m planning of throwing a 100 shot at the car soon for extra fun. Is it worth it or should I stay with the 670?

HotRoddin · 06-04-2005, 01:16 AM

Everytime that question is asked around here, we all get in a fist fight

lol ... With me it would depend on how much track time (wide open throttle) time you get. If it's mostly a street car with a mild cam, you should be fine with what you have. If you're gonna wrap it up really tight and want all the top end you can bleed out of it, i'd make the change, IMO

Rod

Gearhead999 · 06-05-2005, 08:53 AM

Agree with HotRoddin for the most part.

A drivable street car with an automatic should be OK with the 670. Also, the automatic doesn't need a double pumper or mechanical secondaries. Just overkill.

Street driving/racing depends on low end torque more then anything else. Large carbs kill low end punch.

Dave_mustang_50 · 06-05-2005, 09:08 AM

Thanks for the replies. Looks like im gonna stay with the 670 for now. I just wasnt sure if the 750 would have been better with a shot of spray. The Holley site lists the 670 for 300-400 hp cars.

06-03-2005, 10:47 PM	#1
Dave_mustang_50 Registered Member Join Date: Aug 1999 Location: New Port Richey, Florida Posts: 483	What size carb? I`m thinking of loosing the 670 cfm carb on the 351C and going with a 750DP. The kicker is i`m not sure what cam is in the car. The guy I bought it from didnt know, but said it was a comp cam 2 above stock. I`m planning of throwing a 100 shot at the car soon for extra fun. Is it worth it or should I stay with the 670? __________________ 1969 Mach 1 351C with a c6(for now) Sold 92 Rag Top GT Procharged & intercooled DSS 331 LC Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.

06-04-2005, 01:16 AM	#2
HotRoddin cranky old man Join Date: Sep 2001 Location: Longview Texas Posts: 683	Re: What size carb? Everytime that question is asked around here, we all get in a fist fight lol ... With me it would depend on how much track time (wide open throttle) time you get. If it's mostly a street car with a mild cam, you should be fine with what you have. If you're gonna wrap it up really tight and want all the top end you can bleed out of it, i'd make the change, IMO Rod __________________ Under Construction: 64 Falcon 372 cu in. stroker 1:72 rod ratio 6.250" rods (long rod), Comp Cams XE274 230/236 520/526 @ .050, Scorpion Rollers, Roush 200 irons, 10:1 Keith Blacks, Hedman long tubes, 750 Holley DP, Edelbrock Victor Jr., C4 3500 stall, gears and tires to be anounced.

06-05-2005, 08:53 AM	#3
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	Re: What size carb? Agree with HotRoddin for the most part. A drivable street car with an automatic should be OK with the 670. Also, the automatic doesn't need a double pumper or mechanical secondaries. Just overkill. Street driving/racing depends on low end torque more then anything else. Large carbs kill low end punch. __________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic

06-05-2005, 09:08 AM	#4
Dave_mustang_50 Registered Member Join Date: Aug 1999 Location: New Port Richey, Florida Posts: 483	Re: What size carb? Thanks for the replies. Looks like im gonna stay with the 670 for now. I just wasnt sure if the 750 would have been better with a shot of spray. The Holley site lists the 670 for 300-400 hp cars. __________________ 1969 Mach 1 351C with a c6(for now) Sold 92 Rag Top GT Procharged & intercooled DSS 331 LC Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.

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