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  #11  
Old November 20th, 2016, 02:24 AM
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Default Re: 1961 GMC 5500 Tilt Cab Project

I would do a 4 barrel for that engine.

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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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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  #12  
Old November 20th, 2016, 02:41 AM
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Default Re: 1961 GMC 5500 Tilt Cab Project

Quote:
ok, found the dizzy hei and this carb.
is this the carb model that will work? if you know...



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Swapping out for the HEI and the carb won't improve your mileage by more than 1-2 mpg. You'll see 12-15mpg on average, which was pretty decent for the time.

The HEI and carb will make cold starts easier and will make the engine run smoother though, provided it's running not-so-smooth now. If that ain't broke, you can keep it as a rotor/points system and drive it like you stole it. These engines are very tough.
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  #13  
Old November 20th, 2016, 02:43 AM
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Default Re: 1961 GMC 5500 Tilt Cab Project

Quote:
Swapping out for the HEI and the carb won't improve your mileage by more than 1-2 mpg. You'll see 12-15mpg on average, which was pretty decent for the time.

The HEI and carb will make cold starts easier and will make the engine run smoother though, provided it's running not-so-smooth now. If that ain't broke, you can keep it as a rotor/points system and drive it like you stole it. These engines are very tough.
He'd be lucky to see 10 in a truck that size. The bigger carb and HEI swap with dual exhaust on my 305 was quite an improvement. More power over anything.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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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  #14  
Old November 20th, 2016, 03:09 AM
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Default Re: 1961 GMC 5500 Tilt Cab Project

Quote:
He'd be lucky to see 10 in a truck that size. The bigger carb and HEI swap with dual exhaust on my 305 was quite an improvement. More power over anything.
He's got a two speed rear end and a 401.

As for your truck, you had issues with yours before you dropped the HEI in, remember? I won't argue that exhaust though. GMC choked the trucks with a single tiny exhaust.


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  #15  
Old November 20th, 2016, 03:11 AM
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Default Re: 1961 GMC 5500 Tilt Cab Project

Quote:
He's got a two speed rear end and a 401.

As for your truck, you had issues with yours before you dropped the HEI in, remember? I won't argue that exhaust though. GMC choked the trucks with a single tiny exhaust.


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Still...that is a heavy truck. lol Nope, never had fuel issues with mine even with the 4 barrel and points setup. The old dizzy on mine had a sticky advance.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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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  #16  
Old November 20th, 2016, 08:34 PM
bigblockv6 bigblockv6 is online now
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Default Re: 1961 GMC 5500 Tilt Cab Project

Quote:
I would do a 4 barrel for that engine.

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A 4bbl would definitely be even better as long as Dan doesn't mind the extra fabrication which really is no big deal as long as a Magnum manifold is used

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  #17  
Old November 20th, 2016, 08:40 PM
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Default Re: 1961 GMC 5500 Tilt Cab Project

Quote:
A 4bbl would definitely be even better as long as Dan doesn't mind the extra fabrication which really is no big deal as long as a Magnum manifold is used

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And with a Mill you can get the perfect job.

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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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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  #18  
Old November 20th, 2016, 09:55 PM
DanDizzo DanDizzo is offline
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Default Re: 1961 GMC 5500 Tilt Cab Project

will the 4bbl be much different than a 2 bbl on that motor?
Also, it runs a little rough, but the plugs and wires look way old.
gonna do a normal tune up and then plan on an HEI, and holly.
I don't believe a have a Magnum manifold...
Are those hard to find?
Also, if i would see big gains in the 4bbl, which one would be the "best"?
Thanks again for the advice, i truly appreciate it.
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  #19  
Old November 20th, 2016, 11:00 PM
bigblockv6 bigblockv6 is online now
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Default Re: 1961 GMC 5500 Tilt Cab Project

I have done a 4bbl but have not tested it yet. I've heard from others it is a noticeable difference the bigger cubic inch V6 engines. GMC actually did offer a dealer installed option 4bbl conversion. The Magnum 2bbl manifold is based on that 4bbl manifold design it's just cast with a different top base and that's why it's so easy to convert it to a 4bbl. 600-650 cfm would be a good choice for the 401. TJ is the one to talk to about his 4bbl experience though it's on a 305 V6

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  #20  
Old November 21st, 2016, 04:45 AM
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Default Re: 1961 GMC 5500 Tilt Cab Project

Your 401 should be a Magnum, if it's not I will be a little surprised. There are numbers stamped on the block just forward of the right head. If yours is a Magnum it will say 401M.

As for my 305, much better over the 2 barrel.

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Mileage is decent if I can keep my foot out of it and it has no problems lighting the tires in 2nd. I went with an HEI and dual exhaust(recommend, especially for a larger engines).

Ed Snyder would be the one to talk with as he has a 401 with a 4 barrel.

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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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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