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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old June 21st, 2017, 10:49 PM
wcstory wcstory is online now
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Default Anyone with a Holley 4412 500 on a 305

Doing a swap to a Holley 4412 500cfm. I'm changing from the rod linkage to a 71-72 pedal and cable setup because I'll be changing to a 700r4 soon.

What throttle bracket did you use? Pictures please.
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Old June 23rd, 2017, 12:04 AM
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Default Re: Anyone with a Holley 4412 500 on a 305

Here is the linkage for the TH700R4 cable:
https://www.summitracing.com/parts/hly-20-121/overview/

This might be what you need for the throttle cable:
https://www.summitracing.com/parts/hly-20-14/overview/

Other brackets for your Holley:
https://www.summitracing.com/search/...d=transmission
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Old June 23rd, 2017, 12:08 AM
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Default Re: Anyone with a Holley 4412 500 on a 305

I too am planning on doing this swap (don't know when) but I did notice the bore size in my intake is smaller than the 4412 throttle bore. I am going to enlarge the intake bore to match the 4412 throttle bore (if I didn't do this it would be like running a restrictor plate like Nascar has done).
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Old June 23rd, 2017, 12:09 AM
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Default Re: Anyone with a Holley 4412 500 on a 305

Most of the 4 barrels brackets for a Model 4150/4160 will work with the 4412.
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Old June 23rd, 2017, 02:33 AM
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Default Re: Anyone with a Holley 4412 500 on a 305

Thank you

I ordered a 24" throttle cable and it is too long. The Holley 20-95 bracket places the throttle bracket too close to the throttle are on the carb.

I scribed the opening of the adapter plate on the manifold and used a carbide die grinder to match the opening size.
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Old June 23rd, 2017, 02:12 PM
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Default Re: Anyone with a Holley 4412 500 on a 305

You can't cut the cable to length? When I got my lokar throttle cable I cut the housing back and then cut the wire to the length I needed with an air cutter.
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Old June 25th, 2017, 10:32 PM
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Default Re: Anyone with a Holley 4412 500 on a 305

TJ, the throttle cable is the factory GM with the molded snap fitting for the carb side bracket and firewall
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Old June 27th, 2017, 01:24 AM
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Default Re: Anyone with a Holley 4412 500 on a 305

Quote:
Originally Posted by wcstory View Post
TJ, the throttle cable is the factory GM with the molded snap fitting for the carb side bracket and firewall


TJ, I stand corrected. I decided I was going to try cutting my cable so i started trying to get the firewall side of the fitting removed. Low and behold it is not completely bonded, as I thought. I was able to get the fitting loose. I cut the crimped stops off and shortened the cable. once I get the cable and carb fully installed I going to epoxy the fitting permanently in place. Will post some pictures tomorrow
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