cast crank 440, new pistons...balance?
#2465135
03/12/18 11:15 AM
03/12/18 11:15 AM
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Joined: Jan 2003
Posts: 13,374 Marion, South Carolina [><]
an8sec70cuda
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Joined: Jan 2003
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Marion, South Carolina [><]
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Say you had a low compression cast crank ext. balance 440 you were putting in a bracket car. You want to put some decent flattops in it so it had more compression. Keeping the stock rods. Would you need to stay w/ a heavy Speed Pro "Six Pack" piston or could you use (what I'm assuming is slightly lighter) Wiseco Pro True Street piston?
Anyone know a ball park weight of a stock slug vs. either of these two options? How much lighter before it HAS to be balanced?
I usually balance all my stuff w/o question, but this is a real budget buildup.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: cast crank 440, new pistons...balance?
[Re: an8sec70cuda]
#2465182
03/12/18 01:13 PM
03/12/18 01:13 PM
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Joined: Jan 2003
Posts: 13,374 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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OP
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Posts: 13,374
Marion, South Carolina [><]
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Thanks EV2! I've found the "six pack" pistons are very close to the stock 440 piston weight at around 870 grams. Haven't been able to find a weight on the Wisecos yet. This is a "beginner" engine for a friend of mine's son who wants to get started in racing. Just a hydraulic cammed 440 w/ a set of home ported cast iron heads, Holley SD intake, 830 holley, etc. Going in a fairly light (gutted) Dakota truck. If it was mine, I'd probably just re-ring it and use the stock pistons since the motor runs great like it is now in bone stock form.
Later down the road when he gets some experience, they'll likely stroke it and get some good heads for it.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: cast crank 440, new pistons...balance?
[Re: an8sec70cuda]
#2465184
03/12/18 01:25 PM
03/12/18 01:25 PM
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Joined: Jan 2005
Posts: 1,774 Keymar, MD
DusterKid
top fuel
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top fuel
Joined: Jan 2005
Posts: 1,774
Keymar, MD
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I got a set of the Speed Pro in one of my 440's, ran it with stock rods and didn't balance it. It was with a forged crank, not sure if that makes a difference. Didn't seem to hurt anything and ran okay (shifted at 6000, didn't turn over 6200)
I was researching the Weisco pistons awhile back and didn't have any luck finding weights on them, but did email Hughes about P/N:PTS531A3 and they said they weight Piston 546.50, Pin 220.39.
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Re: cast crank 440, new pistons...balance?
[Re: an8sec70cuda]
#2465187
03/12/18 01:30 PM
03/12/18 01:30 PM
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Joined: Jan 2003
Posts: 13,374 Marion, South Carolina [><]
an8sec70cuda
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 13,374
Marion, South Carolina [><]
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DusterKid...thanks! Sounds like the Wisecos are gonna be too light to not balance it.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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