Help switching from 2BB to Quadrajet?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hardwaycooke · 03-01-2015, 04:44 PM

My buddy has a 2bbl 350 on a 70 c10. Like to know all the parts needed to do the swap. I have a 4bbl quadrajet manifold I am giving him. What else does he need?

Which Quadrajet do we use??
Thanks

**truckster** · 03-01-2015, 10:11 PM

It's been a while for me, so I can't remember exactly what besides the manifold and carb have to change - just compare the linkages and you should be OK.

As for the Quadrajet, go with a later-model Quadrajet with the electric choke. It will make setting it up easier and they're very dependable.

Lou Boffa · 03-02-2015, 10:43 AM

subbed

JJLT1 · 03-02-2015, 11:31 AM

RTV, gaskets, air cleaner/base, 3/8 fuel line/fitting, choke/power or linkage or tubes..

don't get the E4MC/E Qjet with the elec plugs on the top and front..

one like this would work, has a hot air choke
http://www.ebay.com/itm/Rochester-Qu...item20f75378d3

call him and ask, he can change the choke to elec..
http://stores.ebay.com/Mountain-Man-...=p4634.c0.m322

hardwaycooke · 03-02-2015, 08:37 PM

Quote:

Originally Posted by JJLT1

RTV, gaskets, air cleaner/base, 3/8 fuel line/fitting, choke/power or linkage or tubes..

don't get the E4MC/E Qjet with the elec plugs on the top and front..

one like this would work, has a hot air choke
http://www.ebay.com/itm/Rochester-Qu...item20f75378d3

call him and ask, he can change the choke to elec..
http://stores.ebay.com/Mountain-Man-...=p4634.c0.m322

What about kickdown, throttle cables?? Are they the same? Thanks
For electric choke, can we just run a wire to a 12 v wire to the fuse box?

racerface · 03-02-2015, 11:27 PM

throw the Quadrajunk away and get a throttle body fuel injection. Less hassel, better fuel management and MPG.

JJLT1 · 03-03-2015, 12:11 PM

kick down depends on what trans?

throttle cable depends on the intake and carb and bracket, year models are different?
youll probly need to mod the bracket,, move it forward or get one for a qjet.
some aftermarkets are really adjustable,
but the thin ones tend to bend if you have a stiff spring?
I have not tried this one.. it also depends on the trans/cable..
http://www.summitracing.com/parts/spe-24283/overview/
heres some pics
http://www.bing.com/images/search?q=...cs&FORM=HDRSC2

some people do run the choke power from the fuse box, lots of ways to do it..
electric choke would need a 12v, key on, fused circuit, I think the choke is a about 20a fuse.
it would be good to use a separate circuit, and a relay,
depending on other loads, older cars are kinda limited on how much stuff you can add..
I would not run the extra power thru the ignition switch/fuse box,
but triggering a relay with it is ok, takes very little power..

the later models run the choke thru the oil pressure switch too,
so the choke heater wont come on till the engine is running..

Coley · 03-03-2015, 12:58 PM

Quote:

Originally Posted by racerface

throw the Quadrajunk away and get a throttle body fuel injection. Less hassel, better fuel management and MPG.

....or just buy a new Toyota...super reliable, really economical and....new. LoL

All Good
Coley

03-01-2015, 04:44 PM	#1
hardwaycooke Registered User Join Date: Sep 2013 Location: anderson, sc Posts: 647	Help switching from 2BB to Quadrajet?? My buddy has a 2bbl 350 on a 70 c10. Like to know all the parts needed to do the swap. I have a 4bbl quadrajet manifold I am giving him. What else does he need? Which Quadrajet do we use?? Thanks __________________ 71 LWB Large Bore 6-71 Blown 383 Stroker 4.11 Motive/EOM Eaton Posi Ported/Polished Carrier 15x8/15x16.5 MT Radials B&M Pro Shifter Truck Name- Spike

03-01-2015, 10:11 PM	#2
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,794	Re: Help switching from 2BB to Quadrajet?? It's been a while for me, so I can't remember exactly what besides the manifold and carb have to change - just compare the linkages and you should be OK. As for the Quadrajet, go with a later-model Quadrajet with the electric choke. It will make setting it up easier and they're very dependable.

03-02-2015, 10:43 AM	#3
Lou Boffa Registered User Join Date: Jan 2013 Location: San Antonio, TX Posts: 733	Re: Help switching from 2BB to Quadrajet?? subbed __________________ Figure out what you want--then figure out what you are willing to give up to get it.

03-02-2015, 11:31 AM	#4
JJLT1 Registered User Join Date: Sep 2009 Location: South of HoustonTX. Posts: 148	Re: Help switching from 2BB to Quadrajet?? RTV, gaskets, air cleaner/base, 3/8 fuel line/fitting, choke/power or linkage or tubes.. don't get the E4MC/E Qjet with the elec plugs on the top and front.. one like this would work, has a hot air choke http://www.ebay.com/itm/Rochester-Qu...item20f75378d3 call him and ask, he can change the choke to elec.. http://stores.ebay.com/Mountain-Man-...=p4634.c0.m322 __________________ JJ 71 SWB 360 Th400 4.56

03-02-2015, 11:27 PM	#6
racerface Registered User Join Date: Dec 2008 Location: wellington ohio Posts: 55	Re: Help switching from 2BB to Quadrajet?? throw the Quadrajunk away and get a throttle body fuel injection. Less hassel, better fuel management and MPG. __________________ Racerface Wellington, Ohio Freedom Isn't Free! GO BUCKEYES!!! Toys: 68 C-30 327-400turbo 68 C-30 Open Road Camper 327-400turbo 81 GMC Sierra 1500 250-350turbo Long Bed 83 K-10 4X4 Scottsdale

03-03-2015, 12:11 PM	#7
JJLT1 Registered User Join Date: Sep 2009 Location: South of HoustonTX. Posts: 148	Re: Help switching from 2BB to Quadrajet?? kick down depends on what trans? throttle cable depends on the intake and carb and bracket, year models are different? youll probly need to mod the bracket,, move it forward or get one for a qjet. some aftermarkets are really adjustable, but the thin ones tend to bend if you have a stiff spring? I have not tried this one.. it also depends on the trans/cable.. http://www.summitracing.com/parts/spe-24283/overview/ heres some pics http://www.bing.com/images/search?q=...cs&FORM=HDRSC2 some people do run the choke power from the fuse box, lots of ways to do it.. electric choke would need a 12v, key on, fused circuit, I think the choke is a about 20a fuse. it would be good to use a separate circuit, and a relay, depending on other loads, older cars are kinda limited on how much stuff you can add.. I would not run the extra power thru the ignition switch/fuse box, but triggering a relay with it is ok, takes very little power.. the later models run the choke thru the oil pressure switch too, so the choke heater wont come on till the engine is running.. __________________ JJ 71 SWB 360 Th400 4.56



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