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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old April 18th, 2016, 04:41 AM
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Default 305E Intake mod.

Got a new intake from Ed Snyder today. Thanks Ed!

So I looked at David Chadwell's 305E manifold modification and it looks like it'll be pretty simple. But, as I don't want to screw this manifold up...lol... Anybody got any tips an tricks? I'll be using a grinder and will be taking off a little at a time. I have a mig welder, and will be getting a carb plate either made or a spacer plate from Napa. Any tips would be awesome guys. Super excited to start working on this!
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1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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  #2  
Old April 18th, 2016, 07:05 AM
bigblockv6 bigblockv6 is online now
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Default Re: 305E Intake mod.

If you got a Magnum manifold there won't be any need to do any welding, It's all about milling the top surface flat, cutting out a square bore pattern then fitting a carburetor spacer plate and drilling & tapping it. I've built two already and right now I'm building a third one, I'll post some pics.
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  #3  
Old April 18th, 2016, 08:05 AM
bigblockv6 bigblockv6 is online now
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Default Re: 305E Intake mod.

Ed has just informed me that the manifold is from a 305D.At this point follow what David Chadwell did, that was is engineering expertise and the correct way to make a 4bbl distribute fuel without any restriction
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Old April 18th, 2016, 02:37 PM
bobdylan bobdylan is online now
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Default Re: 305E Intake mod.

Where do I find David Chadwell's modification? Is anyone running Holley 500cfm 2barrel 4412?
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  #5  
Old April 18th, 2016, 03:30 PM
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Default Re: 305E Intake mod.

Here's a link to the mod:

http://6066gmcclub.com/album.php?albumid=51
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1966 Chevy C10 292 hotrod 6/TKO600
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Old April 18th, 2016, 06:54 PM
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Default Re: 305E Intake mod.

Quote:
Originally Posted by bigblockv6 View Post
Ed has just informed me that the manifold is from a 305D.At this point follow what David Chadwell did, that was is engineering expertise and the correct way to make a 4bbl distribute fuel without any restriction
Yeah, the manifold is from a 62 D series. I've always enjoyed fabricating so I don't mind the little extra challenge. Long as I don't screw this up beyond repair I'll be ok. haha!
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
1977 Chevy C20 572 BBC/TH400
1984 Chevy C30 292/SM465

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Old April 18th, 2016, 07:01 PM
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Default Re: 305E Intake mod.

Quote:
Originally Posted by TJ's GMC View Post
Yeah, the manifold is from a 62 D series. I've always enjoyed fabricating so I don't mind the little extra challenge. Long as I don't screw this up beyond repair I'll be ok. haha!
After you left yesterday, Tom, I realized that the manifold you bought from me was from the original engine (305D) out of my '62 Suburban that I replaced with a 401.

I'd recommend having a machine shop mill down the top surface for you. Then you could use a grinder to open up the hole and the insides if you're trying to do as much as you can yourself.
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Old April 18th, 2016, 07:24 PM
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Default Re: 305E Intake mod.

Quote:
Originally Posted by Ed Snyder View Post
After you left yesterday, Tom, I realized that the manifold you bought from me was from the original engine (305D) out of my '62 Suburban that I replaced with a 401.

I'd recommend having a machine shop mill down the top surface for you. Then you could use a grinder to open up the hole and the insides if you're trying to do as much as you can yourself.
Hi Ed! Thanks for the suggestion. A machinist friend of mine has a mill I believe so I could probably take it to him. Just need to call and make sure I can cause he's always super busy. haha
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
1977 Chevy C20 572 BBC/TH400
1984 Chevy C30 292/SM465

My youtube channel aka Military Chevy:
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  #9  
Old May 4th, 2016, 03:23 PM
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Default Re: 305E Intake mod.

Well the thing that really sucks is that all the machinists are going by the way side around here. I've got two more guys to ask, and if they can't, I'm going to have to use a grinder and sander and hope for the best. lol I'll update.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
1977 Chevy C20 572 BBC/TH400
1984 Chevy C30 292/SM465

My youtube channel aka Military Chevy:
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Old May 11th, 2016, 05:34 PM
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Default Re: 305E Intake mod.

Hi guys....will a 351 magnum manifold bolt up to a 305E? Got a line on one.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
1977 Chevy C20 572 BBC/TH400
1984 Chevy C30 292/SM465

My youtube channel aka Military Chevy:
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