Re: Aluminum Main Cap Usage
[Re: RROD]
#2676015
07/09/19 03:19 PM
07/09/19 03:19 PM
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Joined: Jan 2003
Posts: 19,385 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,385
Las Vegas
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Yes they will be fine in a street strip car. I did a 451 years and years ago with aluminum caps. Car is still street driven now as well as the occasional race pass. When I sold it 16 years ago it logged 5500 street miles and 120 laps at the track running mid 10's in a 65 Belvedere and still does.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Aluminum Main Cap Usage
[Re: RROD]
#2676165
07/10/19 08:08 AM
07/10/19 08:08 AM
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Joined: Jan 2003
Posts: 13,404 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,404
Marion, South Carolina [><]
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I have no doubt they'd be fine, but they're a waste of money for your application IMO.
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: Aluminum Main Cap Usage
[Re: an8sec70cuda]
#2676241
07/10/19 12:32 PM
07/10/19 12:32 PM
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Joined: Aug 2003
Posts: 43,315 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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I have no doubt they'd be fine, but they're a waste of money for your application IMO. OP, if you keep the motor in a good state of tune with no detonation, especially at WOT, you won't have main cap issues at that HP level. Let it detonate a little or a lot and you will
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Aluminum Main Cap Usage
[Re: Cab_Burge]
#2676252
07/10/19 01:07 PM
07/10/19 01:07 PM
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Joined: Jan 2003
Posts: 1,237 North Central, Indiana
Roughbird72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,237
North Central, Indiana
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I have no doubt they'd be fine, but they're a waste of money for your application IMO. OP, if you keep the motor in a good state of tune with no detonation, especially at WOT, you won't have main cap issues at that HP level. Let it detonate a little or a lot and you will Cab, at what point would it be a good idea to change to ductile caps?
72 Plymouth Roadrunner 11.08@123.25
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Re: Aluminum Main Cap Usage
[Re: Roughbird72]
#2676264
07/10/19 01:46 PM
07/10/19 01:46 PM
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Joined: Aug 2006
Posts: 2,141 junction city oregon
viperblue72
top fuel
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top fuel
Joined: Aug 2006
Posts: 2,141
junction city oregon
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I have no doubt they'd be fine, but they're a waste of money for your application IMO. OP, if you keep the motor in a good state of tune with no detonation, especially at WOT, you won't have main cap issues at that HP level. Let it detonate a little or a lot and you will Cab, at what point would it be a good idea to change to ductile caps? You likely already have ductile caps 😉
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Re: Aluminum Main Cap Usage
[Re: Roughbird72]
#2676398
07/10/19 08:48 PM
07/10/19 08:48 PM
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Joined: Aug 2003
Posts: 43,315 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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I haven't found any one now making Ductile iron caps any more. Mopar stopped making and selling them and Milidon doesn't offer them either any more Milidon does offer steel caps, so does 440 Source, but I'm leery of using steel caps on a cast grey iron block I have one of the Koleno high nickel blocks that I am planning on using soon for all out N/A build, hopefully the main caps on it will work for my power level I wish Dart, Brodix or some other good quality manufacturer would make a good Mopar V8 race block out of cast Compact Grey Iron like they do for our competition in the Chevy and Ford camps
Last edited by Cab_Burge; 07/10/19 08:49 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Aluminum Main Cap Usage
[Re: RROD]
#2676702
07/12/19 01:12 AM
07/12/19 01:12 AM
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Joined: Jan 2003
Posts: 31,082 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,082
Oregon
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I have a question concerning aluminum main cap usage. Will aluminum caps survive (Longevity) on a 600 hp street motor? Occasional strip but mostly street and lengthy (out of state) highway trips. Or would it even matter for my intended usage? All this talk about cap walk, harmonics and aluminum caps absorbing a lot of stress of a high performance setup have me thinking overtime. You are overthinking it. Put some ARP main studs in it, have the shop torque them to spec and then line hone it and call it good. Save your money for something that matters.
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Re: Aluminum Main Cap Usage
[Re: RROD]
#2676703
07/12/19 01:28 AM
07/12/19 01:28 AM
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Joined: Aug 2003
Posts: 43,315 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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What block are you wanting to use?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Aluminum Main Cap Usage
[Re: Cab_Burge]
#2676726
07/12/19 07:43 AM
07/12/19 07:43 AM
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Joined: Jan 2003
Posts: 1,237 North Central, Indiana
Roughbird72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,237
North Central, Indiana
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According to their website, Milodon still offers ductile iron caps. Milodon caps I saw that on their website also last year, according to Tom they don't have them anymore when I called to order several sets, just steel now Huh, why list them as ductile? Summit and Jegs have them listed as ductile. I wonder how many have been purchased under that assumption?
72 Plymouth Roadrunner 11.08@123.25
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Re: Aluminum Main Cap Usage
[Re: RROD]
#2676808
07/12/19 12:52 PM
07/12/19 12:52 PM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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You dont need aluminum caps. Stud it, align hone it properly, balance the rotating assembly correctly, and tune it. Yours is simply not an application where it really benefits from it. Good luck.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: Aluminum Main Cap Usage
[Re: AndyF]
#2676812
07/12/19 01:01 PM
07/12/19 01:01 PM
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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 have a question concerning aluminum main cap usage. Will aluminum caps survive (Longevity) on a 600 hp street motor? Occasional strip but mostly street and lengthy (out of state) highway trips. Or would it even matter for my intended usage? All this talk about cap walk, harmonics and aluminum caps absorbing a lot of stress of a high performance setup have me thinking overtime. You are overthinking it. Put some ARP main studs in it, have the shop torque them to spec and then line hone it and call it good. Save your money for something that matters. Been using stock caps with ARP studs on 600 HP street engines. On a street engine, your not normally at WOT all the time anyway. Save the money you would have spent on caps and get a light weight rotating assembly that will take strain off the block and caps.
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Re: Aluminum Main Cap Usage
[Re: 451Mopar]
#2676913
07/12/19 08:52 PM
07/12/19 08:52 PM
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Joined: Jan 2003
Posts: 547 Minnesota
RROD
OP
mopar
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OP
mopar
Joined: Jan 2003
Posts: 547
Minnesota
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Thanks for all the advise everyone. With all the different ways and opinions to build a mouse trap I do tend to overthink the available options.
Last edited by RROD; 07/13/19 05:48 PM.
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