Re: 72-73 340: Changing to a forged crank
[Re: Kern Dog]
#2007784
02/08/16 03:09 AM
02/08/16 03:09 AM
|
Joined: May 2007
Posts: 1,445 Maryland
Dads426
pro stock
|
pro stock
Joined: May 2007
Posts: 1,445
Maryland
|
Rods are the same for all 340's, stock pistons weigh the same; the difference is the compression height between the cast/forged crank 340's. B&M makes a flex plate with the correct scallop for a cast crank motor, or most converters can be ordered with the correct weight.
Crank swap isn't really necessary unless you are pushing it really hard. The cast 340 cranks are pretty stout.
2012 422 Allstars NSS Champion 2013 422 Allstars NSS Champion 2014 422 Allstars NSS Champion
|
|
|
Re: 72-73 340: Changing to a forged crank
[Re: Dads426]
#2008355
02/09/16 01:41 AM
02/09/16 01:41 AM
|
Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
master
|
master
Joined: Jan 2003
Posts: 9,826
las vegas
|
Rods are the same for all 340's, stock pistons weigh the same; the difference is the compression height between the cast/forged crank 340's. B&M makes a flex plate with the correct scallop for a cast crank motor, or most converters can be ordered with the correct weight.
Crank swap isn't really necessary unless you are pushing it really hard. The cast 340 cranks are pretty stout. Stock piston weight the same?,,,,if you change the compression height by almost a tenth of an inch from 1.84 to around 1.74...they are going to weight the same?
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)
|
|
|
Re: 72-73 340: Changing to a forged crank
[Re: Kern Dog]
#2008361
02/09/16 01:49 AM
02/09/16 01:49 AM
|
Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
master
|
master
Joined: Jan 2003
Posts: 9,826
las vegas
|
nhra shows the 71 piston at 672 grams..and the 72-73 piston at 658....so hell..dont worry about the balance ....lol
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)
|
|
|
Re: 72-73 340: Changing to a forged crank
[Re: 70AARcuda]
#2009666
02/11/16 01:57 AM
02/11/16 01:57 AM
|
Joined: May 2007
Posts: 1,445 Maryland
Dads426
pro stock
|
pro stock
Joined: May 2007
Posts: 1,445
Maryland
|
[/quote]Stock piston weight the same?,,,,if you change the compression height by almost a tenth of an inch from 1.84 to around 1.74...they are going to weight the same?[/quote] Piston is physically the same size, pin location is drilled 0.10" higher. This book has some good info: HP1405 Hot Rod Small Block Mopars
2012 422 Allstars NSS Champion 2013 422 Allstars NSS Champion 2014 422 Allstars NSS Champion
|
|
|
|
|