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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old May 9th, 2019, 05:00 PM
jerrspud jerrspud is offline
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Default 305e Holley 500 swap question

Hello,

I was able to get the info about the carb type and adapter needed for the swap, but there is some basic info that I'm missing. I'm normally an all stock guy, so I'm a but stumped with modifications
http://6066gmcguy.com/holley.html


1. Do I put the mr. gasket adapter on top of the original spacer or do I remove the original spacer?


2. Linkage: I don't see an easy way to get the original throttle linkage to fit. Is there an adapter I need for the carb or different linkage?


thank you
Jerr
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File Type: jpg IMG_20190508_201625429.jpg (1.38 MB, Multiple views, 94 clicks)
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  #2  
Old May 9th, 2019, 06:23 PM
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63gmc4x4 63gmc4x4 is offline
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Default Re: 305e Holley 500 swap question

remove the factory spacer and studs, your current accel rod should fit on the bigger hole just fine you may needs to unthread it for more legnth
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Old May 9th, 2019, 06:58 PM
jerrspud jerrspud is offline
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Default Re: 305e Holley 500 swap question

awesome.... that sounds simple.... thank you!


jerr
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Old May 9th, 2019, 11:39 PM
jagarra jagarra is offline
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Default Re: 305e Holley 500 swap question

Now if you bought a Holley with a manual choke you will find the cable isn't long enough with the new carburetor. On the right side of your column there is a block off plug in the dash for something not installed, I moved the choke cable assembly from the left side to that side and had enough length.
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Old May 10th, 2019, 03:55 AM
bigblockv6 bigblockv6 is online now
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Default Re: 305e Holley 500 swap question

On my 68 the choke cable was actually long enough without requiring to move the cable to the right side of the cluster.
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Old May 10th, 2019, 02:11 PM
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Default Re: 305e Holley 500 swap question

Because I had a '60, I had to create this linkage. Works perfect.
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Old May 12th, 2019, 05:01 PM
jerrspud jerrspud is offline
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Default Re: 305e Holley 500 swap question

Quote:
Originally Posted by jbgroby View Post
Because I had a '60, I had to create this linkage. Works perfect.
what's the number for that spring bracket? I don't know what it's called.
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Last edited by jerrspud; May 12th, 2019 at 05:07 PM.
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Old May 12th, 2019, 05:01 PM
jerrspud jerrspud is offline
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Default Re: 305e Holley 500 swap question

yes... I have manual choke. I have to buy a new cable so I hope it comes long and I can trim it down.

i found the adjustable end of the throttle rod and it seems like it will work well.

truck stated really well with new carb. I assume I'll have to do some tuning to get it to be drivable, and I need to hook up the vacuum advance to the carb as well.
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Old May 14th, 2019, 03:23 AM
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Default Re: 305e Holley 500 swap question

Jerrspud,

Others might disagree (and probably will), I have found that my 305e engine runs a little rich with the stock Holley 500 (which does help the engine start easier), but I have not taken the time to play around with it. Because the choke on the 500 also moves the throttle on the other side of the carburetor, it is difficult to pull out the replacement choke and longer cable (from NAPA) that I am using. This is made easier by pushing down on the throttle pedal. But converting to the 500 is well worth the effort and makes the engine run much better at higher RPMs.

JRMunn
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Old May 14th, 2019, 04:21 AM
bigblockv6 bigblockv6 is online now
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Default Re: 305e Holley 500 swap question

You're right the 305 V6 may run rich with the Holley 500 but it's an easy fix by just installing leaner jets.
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