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340 piston question
#424447
07/30/09 11:05 PM
07/30/09 11:05 PM
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Joined: Mar 2005
Posts: 386
Maryland
reno340
OP
enthusiast
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OP
enthusiast
Joined: Mar 2005
Posts: 386
Maryland
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I have always wondered if you can put in '68-'71 340 pistons (internally balanced) on a '72+ 340 (externally balanced) engine without any mods. I guess i was wondering if it throws off the balance. Just always wondered. 
"There are only three real sports, Mountain climbing, Bull Fighting and Auto Racing. The rest are just games" - Earnest Hemmingway If you can't run with the big dogs, stay on the porch!! https://www.youtube.com/watch?v=_xQJtN1_6DU
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Re: 340 piston question
[Re: reno340]
#424448
07/30/09 11:27 PM
07/30/09 11:27 PM
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Joined: Aug 2006
Posts: 1,609
Southern Cal
Noblewk
top fuel
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top fuel
Joined: Aug 2006
Posts: 1,609
Southern Cal
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yes you can as long as your using all 8 pistons. Your balancing on "Internal" balancing is done by either adding or removing weight to the crank. 1 Rod and 1 Piston is required. External Balancing the weight is added or removed to the "Balancer" and Flywheel or torque converter......
66 Dart GT, 402 11.18:109 Best
63 1/2 Galaxie 500XL 406 4Speed 13.20:103 Best
2000 Ram
2005 Durango Hemi.
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Re: 340 piston question
[Re: reno340]
#424449
07/31/09 03:15 AM
07/31/09 03:15 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Do you know the weight difference between the 2
live every 24 hour block of time like it's your last day on earth
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Re: 340 piston question
[Re: RapidRobert]
#424450
08/03/09 10:40 PM
08/03/09 10:40 PM
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Joined: Mar 2005
Posts: 386
Maryland
reno340
OP
enthusiast
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OP
enthusiast
Joined: Mar 2005
Posts: 386
Maryland
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Quote:
Do you know the weight difference between the 2
I was kind of asking the same thing in a round about way. So, does anyone know what we are looking at to basically make an old style 340 out of a lower compression 340?
"There are only three real sports, Mountain climbing, Bull Fighting and Auto Racing. The rest are just games" - Earnest Hemmingway If you can't run with the big dogs, stay on the porch!! https://www.youtube.com/watch?v=_xQJtN1_6DU
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Re: 340 piston question
[Re: reno340]
#424451
08/03/09 11:44 PM
08/03/09 11:44 PM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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cast cranks are lighter then forged cranks...that is why they are externally balanced..
if you add heavier pistons 68-71, you will need to add more weight..either by mallory metal in the crank....or exteranlly on the balancer and flexplate
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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