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340 water pump and pulley questions #61379
05/22/08 12:13 AM
05/22/08 12:13 AM
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Missouri
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Confusedcuda Offline OP
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Okay guys, I have a 71 340 I am putting in my 67 barracuda. My cuda had a 273. Can I use my 273, water pump(cast-iron)pump pulley, and crank pulley? I ask this because, I would have to have my radiator switched, if I go to the 340 wp. Also the 340 had a/c powersteering,etc. so it has a 3 groove pulley, where my car has none of. The 340 wp will not work with any of this because it is a longer pump. My 273 water pump is an after market that has 8 blades, wheres the 340 only has 6, but it is aluminum and has a little more area to it. If I use my 273 pulleys and water pump, will it cool enough? I noticed that from 68 to 69 the 340 and 273 used the same pump. Does the more blades help? Will my smaller pulleys be okay on my 340? Thanks

Re: 340 water pump and pulley questions [Re: Confusedcuda] #61380
05/22/08 06:01 AM
05/22/08 06:01 AM
Joined: Aug 2004
Posts: 3,333
MARYLAND
69Cuda340S Offline
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The older WP will bolt right to the newer timing chain cover and work correctly. The lower hose will block the timing marks some what but you'll still be able to see them. The 6 blade WP is for AC cars and must be used with the AC pulleys because they spin the fan/WP faster on AC cars. Therefore less WP blades are used to prevent cavitation (condition where water stops flowing at higher RPMs). Everything will work assuming you have a "thin" crank damper with the proper offset pulley bolt holes. You also need to use the older alternator brackets so it will all line up.

Re: 340 water pump and pulley questions [Re: 69Cuda340S] #61381
05/22/08 08:23 AM
05/22/08 08:23 AM
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Missouri
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Confusedcuda Offline OP
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Yes, my crank pulley does line up to the 340 dampner.I do have the timing gauge on the drivers side but my 273 water pump has a slide on one that goes on the pass. side. Don't know how accurate that is, but may work. My stock 2 core radiator should be good enough to work I hope. I love the stock look of it. I may try to find a fan shroud that works, do you think this would help? Thanks for taking time to answer.

Re: 340 water pump and pulley questions [Re: Confusedcuda] #61382
05/22/08 08:31 AM
05/22/08 08:31 AM
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Posts: 3,333
MARYLAND
69Cuda340S Offline
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Fan shroud will make a big difference but you will probably need a three core to run it on the hot days.

Re: 340 water pump and pulley questions [Re: 69Cuda340S] #61383
05/22/08 09:36 AM
05/22/08 09:36 AM
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Missouri
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Confusedcuda Offline OP
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So you don't think it matters that my crank pulley is smaller than the 3groove crank pulley that was on the 340? Could this add any power, like a underdrive pulley?

Re: 340 water pump and pulley questions [Re: Confusedcuda] #61384
05/22/08 10:52 AM
05/22/08 10:52 AM
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Lincoln Nebraska
RapidRobert Offline
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Lincoln Nebraska
Quote:

So you don't think it matters that my crank pulley is smaller than the 3groove crank pulley that was on the 340? Could this add any power, like a underdrive pulley?


You'll be fine,just be sure & add a shroud.


live every 24 hour block of time like it's your last day on earth
Re: 340 water pump and pulley questions [Re: RapidRobert] #61385
05/22/08 10:31 PM
05/22/08 10:31 PM
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Posts: 6,167
Maryland
GO_Fish Offline
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My

Like everybody said, the early small block WP and cover will bolt up directly to the 340.

I've bolted up my '68 318 timing cover and water pump to my healthy '74 360 installed in my '68 B'cuda. I am having problems running hot with my 2 core 22" radiator in weather over 70*. To attempt to combat the heating, I'm adding a deep pan with cooling tubes to my 904 to help shed heat from the 9.5" convertor (literature says the pan can shed up to 20*) before it can get to the radiator. I have high oil pressure right now running 20w50 Rotella, so I'm going to switch down to 10w30 and ZDDPlus to reduce some heat there also. Last move would be to replace the water pump with a HP unit with a disc attached to the impeller to reduce cavitation. If none of these 3 work, then I'll be looking at an aluminum radiator. FYI, I'm running a 22" shroud off a /6 (mounted upside down with minor mods), and a 5 blade viscous fan presently.


Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph
Re: 340 water pump and pulley questions [Re: Confusedcuda] #61386
05/22/08 10:45 PM
05/22/08 10:45 PM

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Quote:

So you don't think it matters that my crank pulley is smaller than the 3groove crank pulley that was on the 340? Could this add any power, like a underdrive pulley?




You need to see if the pump is the bigger diameter, 8 blade, or the smaller diameter 6 blade to determine the speed it should run. The big diameter impeller should be at .95 ther crank rpm and the small diameter impeller should run at about 1.3 times the crank rpm. Be sure to measure the pulleys at the pitch diameter (not outside diameter) when you do your calculations. Pitch diameter will be about 2/3 of the way up the belt thickness.

Re: 340 water pump and pulley questions [Re: 69Cuda340S] #61387
05/22/08 11:10 PM
05/22/08 11:10 PM
Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish Offline
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Maryland
Quote:

The older WP will bolt right to the newer timing chain cover and work correctly. The lower hose will block the timing marks some what but you'll still be able to see them. The 6 blade WP is for AC cars and must be used with the AC pulleys because they spin the fan/WP faster on AC cars. Therefore less WP blades are used to prevent cavitation (condition where water stops flowing at higher RPMs). Everything will work assuming you have a "thin" crank damper with the proper offset pulley bolt holes. You also need to use the older alternator brackets so it will all line up.




Sooo... If I'm running a 6 blade a/c WP with non-a/c 8 blade WP pulley (on a non-a/c car), the result is overheating??? I can't think right now. My temp seems to creep highest at 30-40 mph speeds, cooler at idle and cooler on the highway... (yes this would be a hi-jack)


Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph






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