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Re: Ductile iron rockers vs. aluminum roller rockers?
[Re: GY3]
#2921991
05/13/21 08:17 AM
05/13/21 08:17 AM
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Joined: Jan 2003
Posts: 13,363
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,363
Marion, South Carolina [><]
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You can't buy cheap aluminum rockers and expect them to last very long w/ big cams and high spring pressures.
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: Ductile iron rockers vs. aluminum roller rockers?
[Re: mopardude318]
#2922025
05/13/21 09:30 AM
05/13/21 09:30 AM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Thanks for the pictures.
What wall thickness are the bushings?
Boffin Emeritus
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Re: Ductile iron rockers vs. aluminum roller rockers?
[Re: Cab_Burge]
#2922111
05/13/21 01:35 PM
05/13/21 01:35 PM
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Joined: Aug 2003
Posts: 4,977
new jersey usa
11secdart
master
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master
Joined: Aug 2003
Posts: 4,977
new jersey usa
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I ran 273 iron rockers on my 340s for years and iron ones on my W2 heads ,the biggest cam I used was a 627 lift roller and never had a problem, replaced one adjuster after many years. I will be using them again on my under construction/ rebuild W2 head 363.
Last edited by 11secdart; 05/13/21 01:36 PM.
68 Dart 410 / 904
92 D150 original owner
21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4
23 Audi Q5
16 Honda HRV
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Re: Ductile iron rockers vs. aluminum roller rockers?
[Re: VernMotor]
#2922132
05/13/21 02:54 PM
05/13/21 02:54 PM
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Joined: Feb 2003
Posts: 1,099
Massillon, Ohio
cudatom
super stock
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super stock
Joined: Feb 2003
Posts: 1,099
Massillon, Ohio
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I have had a set of Ductile iron rockers on my car for 30 years. race car. has a 640 lift cam in it now. I am building a new engine now and I bought new set of Harlem sharp rockets for it. We will see. I hope I am not disappointed. We have a set of HS that have been in use since the 70's. The 1st three engines ran any where from low 10's to mid 11's They have been on my brothers GTX since 2002. Street strip car 500-1000 miles a yr.
Ok
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Re: Ductile iron rockers vs. aluminum roller rockers?
[Re: GY3]
#2922144
05/13/21 03:31 PM
05/13/21 03:31 PM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Nice if there were some math to calculate time X stress to failure for aluminum rockers. We know most of the factors, but how much value for each?
Boffin Emeritus
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