3 speed transmission
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5th Wheeling
Joined: Jun 2017
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3 speed transmission
I am wanting to freshen up my 272 a little bit maybe a mild street cam 4 barrel intake and am just wanting to make sure that won't be any problem for the 3 speed. Also I have another motor that I think might be a 292 and might do the same kind of build. Just want to make sure that both will handle that just fine.
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5th Wheeling
Joined: Jun 2017
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What is the way to tell if it is Heavy or light duty because it is a 1/2 ton long bed I'm not sure if that would make any difference.
Fleet Owner
Joined: Dec 2000
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From: Central PA
Look on your data plate. I am assuming you're is a 56 so it should be on the door jamb. The HD transmission would have been an option.
Logistics Pro
Joined: Nov 2011
Posts: 4,685
Likes: 80
From: Northville, MI
Just don't over-carburate the engine or you will lose bottom end power. It will stumble off idle. Check Holley's website for the carb selector page. A Holley 390 cfm should be about right.
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5th Wheeling
Joined: Jun 2017
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Holley recommends 570 or 600 cfm for it.
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Fleet Owner
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Logistics Pro
Joined: Nov 2011
Posts: 4,685
Likes: 80
From: Northville, MI
Based upon your post #1 description those seem to be on the large side. I'm not sure what parameters you used but using a 5,000 rpm redline and following your description of "mildly modified" below are the recommendations. There are a lot of them but the larger the carb the more air and fuel need to be used to obtain maximum power. But there reaches a point where too much is not better and that perfect balance is not reached.
Note in this video that they talk about Mores Law (not Moores Law) as in more is not better.
They often cite that this is the most common error made by most people trying to increase the performance of their engine. We have all done it, me included.
Holley Carb Selector Tool
Note in this video that they talk about Mores Law (not Moores Law) as in more is not better.
They often cite that this is the most common error made by most people trying to increase the performance of their engine. We have all done it, me included.
Holley Carb Selector Tool
Thread Starter
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5th Wheeling
Joined: Jun 2017
Posts: 29
Likes: 0
Based upon your post #1 description those seem to be on the large side. I'm not sure what parameters you used but using a 5,000 rpm redline and following your description of "mildly modified" below are the recommendations. There are a lot of them but the larger the carb the more air and fuel need to be used to obtain maximum power. But there reaches a point where too much is not better and that perfect balance is not reached.
Note in this video that they talk about Mores Law (not Moores Law) as in more is not better.
https://youtu.be/pKG8-NnS9OI
They often cite that this is the most common error made by most people trying to increase the performance of their engine. We have all done it, me included.
Holley Carb Selector Tool
Note in this video that they talk about Mores Law (not Moores Law) as in more is not better.
https://youtu.be/pKG8-NnS9OI
They often cite that this is the most common error made by most people trying to increase the performance of their engine. We have all done it, me included.
Holley Carb Selector Tool
Logistics Pro
Joined: Nov 2011
Posts: 4,685
Likes: 80
From: Northville, MI
The electric choke is very nice and works well. Given the trade off between choke type and performance IMO choose performance. I'm not sure what type of choke the 500 cfm carb that Ross suggested has.
More Turbo
Joined: Jun 2003
Posts: 687
Likes: 80
I have an Edelbrock 500 on my 292 now since I swapped out the 272. It comes it both flavors- manual or electric. Since I had the choke cable and **** already, I went manual. It works just fine, and I can control it myself. I have since rebuilt the three speed, and it's still going strong....
Post Fiend
Joined: Feb 2008
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From: St Albert, Alberta
Holley offers bolt on manual choke kits to replace the automatic choke.
Fleet Owner
Joined: Dec 2000
Posts: 25,376
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From: Central PA
Steve, that trip sounds interesting. Tell us more about it in a separate thread and post some pics if you have any.