Re: Steel Billet or Aluminum main caps for street/strip motor
[Re: Stanton]
#3137046
04/10/23 09:37 PM
04/10/23 09:37 PM
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Joined: Feb 2005
Posts: 20,272 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,272
PA.
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The only stock 440 block I ever cracked had 440source steel caps on.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: Steel Billet or Aluminum main caps for street/strip motor
[Re: pittsburghracer]
#3137047
04/10/23 09:46 PM
04/10/23 09:46 PM
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Joined: Jan 2003
Posts: 10,091 MN
JERICOGTX
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,091
MN
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Not sure why you’d have to service the bearings more than usual with aluminum main caps? Some manufacturers use iron blocks with aluminum mains. Cadillac did this IIRC.
69 GTX
68 Road Runner
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Re: Steel Billet or Aluminum main caps for street/strip motor
[Re: Stanton]
#3137056
04/10/23 10:12 PM
04/10/23 10:12 PM
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Joined: May 2005
Posts: 2,065 Apollo, PA.
B1MAXX
top fuel
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top fuel
Joined: May 2005
Posts: 2,065
Apollo, PA.
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I don't think 600 HP warrants anything other than stock caps. Just my opinion. x2
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Re: Steel Billet or Aluminum main caps for street/strip motor
[Re: GTXMEX]
#3137067
04/10/23 10:53 PM
04/10/23 10:53 PM
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Joined: Feb 2005
Posts: 20,272 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,272
PA.
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OK. But if I don't have the factory main caps and only steel billet or Aluminum appear to be available new, what do I go with? You can’t go wrong with aluminum. Monte recommended that to everyone on this site years ago while he was living.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: Steel Billet or Aluminum main caps for street/strip motor
[Re: GTXMEX]
#3137068
04/10/23 10:56 PM
04/10/23 10:56 PM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,719
Bend,OR USA
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If your going to replace them don't use steel The harmonics from cap walk will crack the main webbing and you won't know it until that block fails Aluminum caps don't do that is what I have seen so far Your better bet is to find a good race block or a good 400 block withe thicker main webbing and build it with good caps and so on, they tak ea lot more power and punishment than any stock 440 production car block made to date
Last edited by Cab_Burge; 04/10/23 10:57 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Steel Billet or Aluminum main caps for street/strip motor
[Re: GTXMEX]
#3137434
04/12/23 04:03 PM
04/12/23 04:03 PM
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Joined: Jan 2003
Posts: 13,492 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,492
Marion, South Carolina [><]
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At 600 hp, the stock caps will be fine. If I were going through the expense of installing new caps, they'd be aluminum.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '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: Steel Billet or Aluminum main caps for street/strip motor
[Re: B1MAXX]
#3137596
04/13/23 02:10 AM
04/13/23 02:10 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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I don't think 600 HP warrants anything other than stock caps. Just my opinion. x2 x3 (with ARP studs)
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Re: Steel Billet or Aluminum main caps for street/strip motor
[Re: 451Mopar]
#3137599
04/13/23 02:37 AM
04/13/23 02:37 AM
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Joined: Jul 2009
Posts: 494 IL
EchoSixMike
mopar
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mopar
Joined: Jul 2009
Posts: 494
IL
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If you get the tune wrong, especially with nitrous, no main caps are going to help you. Aluminum caps help dampen vibrations and reduce/prevent fretting and windmilling. Magnesium would be even better, but then you'd have a corrosion issue in that environment. S/F....Ken M
Last edited by EchoSixMike; 04/13/23 02:38 AM.
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Re: Steel Billet or Aluminum main caps for street/strip motor
[Re: EchoSixMike]
#3137604
04/13/23 03:39 AM
04/13/23 03:39 AM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,719
Bend,OR USA
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If you get the tune wrong, especially with nitrous, no main caps are going to help you. Aluminum caps help dampen vibrations and reduce/prevent fretting and windmilling. Magnesium would be even better, but then you'd have a corrosion issue in that environment. S/F....Ken M Dang ,dude I hope that didn't hurt you or the car
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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