Quadrajet and manifold question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71Shortbed · 05-01-2005, 01:36 PM

I've got a '71 with a 307 and standard 2bbl carb. Will a '71 4bbl manifold and quadrajet fit this? Will I need to swap throttle linkage, gas lines or what all is involved? I don't want to mess with it if it's a lot of hassle.

dwaite72lnghrn · 05-01-2005, 09:18 PM

If the manifold is off a SBC then it will fit. The only thing is that a Q-jet is more carb then that engine can handle. Unless you have a really big cam and ported heads and big headers. '71 and up I think all used cable for gas pedal so as long as the carb has the bracket on the back for the cable linkage you can use it.

Green Machine · 05-01-2005, 09:47 PM

I would have to respectfully disagree that the q-jet is to big for a 307. Small prmaries and a vacuum operated secondary will feed it only what if can take. Maybe some rejetting and adjustment required, but anything would beat a worn out mini 2 bbl IMHO.

Fuel line on Q-jet is 3/8 and your 307 will have 5/16 from the pump, will have to alter fuel line anyway as 2bb is in differnt location. Might be best to swap fuel pump to 350 style and run all new 3/8 steel line from pump.

BTW I have run a q-jet on a 283 in the past and currently have a holley 650 spreadbore on a cast q-jet intake on my cuurent 307, only mod is a small (262) cam.

71Shortbed · 05-01-2005, 10:14 PM

Thanks guys. After some research I think I'm going to go with an aluminum intake and a 600cfm carb. By the time I pay shipping on a used iron manifold I can buy a nice used aluminum Edelbrock. Sounds like I should be ok with the linkage and I'll redo the fuel line.

GMC AMI · 05-02-2005, 06:56 AM

Here is my 307 after the swap. You will like yours better for sure.

71Shortbed · 05-02-2005, 07:12 AM

Wow. That looks much better Mike. What carb are you running?

Thanks

70c10 · 05-02-2005, 07:22 AM

Sharp looking motor Mike!

05-01-2005, 01:36 PM	#1
71Shortbed Registered User Join Date: Jul 2004 Location: Lilburn, GA Posts: 209	Quadrajet and manifold question I've got a '71 with a 307 and standard 2bbl carb. Will a '71 4bbl manifold and quadrajet fit this? Will I need to swap throttle linkage, gas lines or what all is involved? I don't want to mess with it if it's a lot of hassle.

05-01-2005, 09:18 PM	#2
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	If the manifold is off a SBC then it will fit. The only thing is that a Q-jet is more carb then that engine can handle. Unless you have a really big cam and ported heads and big headers. '71 and up I think all used cable for gas pedal so as long as the carb has the bracket on the back for the cable linkage you can use it. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

05-01-2005, 09:47 PM	#3
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	I would have to respectfully disagree that the q-jet is to big for a 307. Small prmaries and a vacuum operated secondary will feed it only what if can take. Maybe some rejetting and adjustment required, but anything would beat a worn out mini 2 bbl IMHO. Fuel line on Q-jet is 3/8 and your 307 will have 5/16 from the pump, will have to alter fuel line anyway as 2bb is in differnt location. Might be best to swap fuel pump to 350 style and run all new 3/8 steel line from pump. BTW I have run a q-jet on a 283 in the past and currently have a holley 650 spreadbore on a cast q-jet intake on my cuurent 307, only mod is a small (262) cam. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 Last edited by Green Machine; 05-01-2005 at 09:51 PM.

05-02-2005, 06:56 AM	#5
GMC AMI Registered User Join Date: Apr 2004 Location: The Other Maine! Posts: 2,236	Little old 307 Here is my 307 after the swap. You will like yours better for sure. Attached Images __________________ 1968 Chevy 4x4 307 4 speed

05-02-2005, 07:22 AM	#7
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Sharp looking motor Mike! __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

05-01-2005, 10:14 PM	#4
71Shortbed Registered User Join Date: Jul 2004 Location: Lilburn, GA Posts: 209	Thanks guys. After some research I think I'm going to go with an aluminum intake and a 600cfm carb. By the time I pay shipping on a used iron manifold I can buy a nice used aluminum Edelbrock. Sounds like I should be ok with the linkage and I'll redo the fuel line.

05-02-2005, 07:12 AM	#6
71Shortbed Registered User Join Date: Jul 2004 Location: Lilburn, GA Posts: 209	Wow. That looks much better Mike. What carb are you running? Thanks



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