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#1 |
Stepsides Are Bedder
Join Date: Feb 2004
Location: Norco, CA
Posts: 238
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I6 to V8 Conversion: Throttle Linkage?
We are in the process of converting our '70 Chevy 1/2T short step from the 6 cyl./3-speed to a 350/700R4 setup and I'm pretty sure that I'm going to have to do something with the stock throttle linkage. Do I need to convert it to the later model cable-style connection? There are plenty of them at our local pick-a-part yards...
Any suggestions? Thanks to all of you guys! This board is the BEST! |
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#2 |
Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,855
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you should just need the throttle linkage out of a 67-72 factory V 8 truck for it to work properly
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My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
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#3 |
Stepsides Are Bedder
Join Date: Feb 2004
Location: Norco, CA
Posts: 238
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Unfortunately, due to the popularity of these years, there's a scarcity of those in my area (So. Cal.), and the prices for NOS parts reflects that.
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#4 |
Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,855
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there are members on this board that will for sure have one for sale. Just ask on the parts board, you just might get lucky and find one close to you. Lots of California members here
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My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
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#5 |
Registered User
Join Date: Sep 2003
Location: Ohio
Posts: 127
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use later cable just use die grinder to make square openining in firewall
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#6 |
Stepsides Are Bedder
Join Date: Feb 2004
Location: Norco, CA
Posts: 238
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Later Cable?
Later cable, as in '73-'87? Or as in '71-'72?
The local pick-a-part is full of the '73-'87 stuff. |
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#7 |
It's just a check engine lamp.
Join Date: Apr 2001
Location: Melbourne, FL
Posts: 311
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I managed to make mine work when I went to my 250 from 327. I don't know how, but I had 2 trucks to work with. I would take a look at the '73-'87 setups and see what it would involve to swap over. If there are alot of them, prices should be pretty cheap. Swapping shouldn't be a big deal at all. I'm going to have to do it soon when I put my 4 barrel on the 250. John
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Active Inliner---bigchevy66 68 SWB Stepside 250 L6/3 on the floor/ Hedman headers, HEI, MSD 6A box, K&N filter, Offy intake and Edelbrock 600cfm 4 barrel Soon to have: WC T-5 five speed 66 SWB Stepside-undergoing restoration |
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#8 | |
Stepsides Are Bedder
Join Date: Feb 2004
Location: Norco, CA
Posts: 238
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A four-barrel on a 250? Now that will be interesting!!!
Quote:
My belief is that anything will go into anything if you have enough time and enough money and, most importantly, the desire to do it. I want to do this, but I have so many other things that have to be done that I don't want to devote a lot of time to this one aspect, but if it is not a major task, then I'll tackle it. It is too tempting not to... |
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#9 |
Firefighter
Join Date: Feb 2001
Location: Yellville, Ar, USA
Posts: 1,943
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I modified a 63 I6's linkage to work on my buddy's 69 with a 350, his original wouldn't work after we changed the intake and carb to an Edelbrock. It works great with the I6 linkage.
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'72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA ![]() ![]() |
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#10 |
Stepsides Are Bedder
Join Date: Feb 2004
Location: Norco, CA
Posts: 238
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Zoomy...
Yup, everything on the I6 that I won't be able to use on the conversion will be up for sale for a reasonable price...not to make a profit, but to help defray the cost of the conversion, and to keep as many of these vehicles on the road as possible. I admire your pluck (and wisdom, in this age of $2+ per gallon of gasoline) in sticking with the 6-cyl.
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#11 |
Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
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You can put a 4 bbl on a six cylinder... takes the correct type intake manifold though... here a pic someone posted at one time.
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Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife. |
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#12 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Everyone seems to make a big deal out of the throttle rod.
There is a lever sticking out of the firewall that is hooked to the pedal inside the truck. Put a block of wood or something similar under the pedal inside the truck to hold it up off of the floor a ways. Next, take a tape measure and measure the distance between the rod and the hole in the carburetor linkage. Now, build a connecting rod that's the right length. Now, you're done. I always use threaded rod and these... ![]() Total cost is under 10 bucks for the whole deal and it takes about 15 minutes. Then, you can say you have a high tech throttle linkage. Make sure and adjust the threaded rod length so the pedal hits the floor when the carburetor hits WOT, so you don't stress out the carburetor linkage arm by trying to torque it over too far. The picture below is my 6 cylinder truck throttle rod before I swapped it over to the longer one for the V8. All you are doing is making a longer connecting rod. You could easily use the 6 cylinder one and lengthen it a few inches with plain 1/4 inch rod available for about a buck at Home Depot. Use a hack saw and welder to splice it longer and weld it together.
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I'm on the Instagram- @Gearhead_Kevin |
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#13 |
It's just a check engine lamp.
Join Date: Apr 2001
Location: Melbourne, FL
Posts: 311
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Stepsides 4Ever-- I had the 250 laying around with only 12k on it, and my 327 was running on 5 cylinders. I really like the straight six though, it's different. Anyway I'm going to run an Offy intake just like Rod posted. One of the moderators on www.inliners.org is running 3 (yes 3) four barrels on his 250. That's his engine in my sig. Very cool stuff.
What Tx Firefighter posted is right on the money. I'm pretty sure all I did was have to adjust the length, and mess with the brackets a little. Easier than trying to go to junk yards and stuff. Good luck. John
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Active Inliner---bigchevy66 68 SWB Stepside 250 L6/3 on the floor/ Hedman headers, HEI, MSD 6A box, K&N filter, Offy intake and Edelbrock 600cfm 4 barrel Soon to have: WC T-5 five speed 66 SWB Stepside-undergoing restoration |
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#14 |
Left Foot Functioning
Join Date: May 2004
Location: Duncan, OK
Posts: 348
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Guys,
Tx's solution looks typically slick, but I'm still working out the details. The donor quadrajet has a post sticking out of the carb linkage arm, which doesn't mate to the post on the carb end on the 6cyl rod. No problem extending the rod, but I'd like to see someone's solution for mating the rod to the Q-jet arm... Thanks...SSOW ![]()
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69 C10 (#1 son's ride) 72 C20 (Dad's farm truck) 82 K30 (Ex - brush pumper project) |
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#15 | |
Resident Curmudgeon
![]() Join Date: Dec 1999
Location: NH
Posts: 6,664
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Quote:
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Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter ![]() Maybe I need to sell some of this crap ![]() Yet another Bozo with a sawz-all |
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#16 |
Left Foot Functioning
Join Date: May 2004
Location: Duncan, OK
Posts: 348
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Thanks, Jeff - that's the setup I've dealt with before, too. Not this time, though. This pic should get us on the same page.
The post on the arm is for a cable linkage, as the carb came from a mid-80's donor. It is swedged in to the arm, so I can probably grind the back off and pull the post out, leaving a hole as you describe. However, the hole will be larger than the 6-cyl linkage post, so I'd need to take up the slop somehow. Another way to go, maybe better, would be to find one of these ball joint thingys that will mate to the fine threads on the end of the rod. ![]() That way, I can put the threaded end through the larger hole tighten it to kill the slop. Thoughts or better ideas, anyone? Thanks...SSOW ![]()
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69 C10 (#1 son's ride) 72 C20 (Dad's farm truck) 82 K30 (Ex - brush pumper project) |
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