305e Holley 500 swap question

[jerrspud]

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

[63gmc4x4]

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

[jerrspud]

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


jerr

[jagarra]

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.

[bigblockv6]

On my 68 the choke cable was actually long enough without requiring to move the cable to the right side of the cluster.

[jbgroby]

Because I had a '60, I had to create this linkage. Works perfect.

[jerrspud]

Originally Posted by jbgroby

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.

[jerrspud]

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.

[jrmunn]

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

[bigblockv6]

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