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 Post subject: 400/425 h beam rods
PostPosted: Sun Jul 08, 2012 4:32 pm 
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Joined: Thu Feb 12, 2009 8:53 pm
Posts: 4
Getting ready to start a 400 build for my 66, mostly a stock build.Has anyone used the h-beams on a build looking for pro's and con's of the rods. Stock rod would work for my build but I want to do this right the first time. Any input would to appreciated.
Nick


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 Post subject: Re: 400/425 h beam rods
PostPosted: Mon Jul 09, 2012 11:43 am 
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Joined: Thu Feb 12, 2009 10:32 am
Posts: 265
Location: Wakeman, Ohio
Many including myself use the H-beam rods (Eagle's for me). I can't think of any cons when compared to a stock rod.

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'65 4-4-2
11.60 @115 mph


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 Post subject: Re: 400/425 h beam rods
PostPosted: Mon Jul 09, 2012 7:09 pm 
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Joined: Thu May 31, 2012 2:32 pm
Posts: 503
i have eagles as well. my former machinist said every eagle rod he has ever seen was out of round and i would have to pay him 300 bucks to recon them. i checked every rod myself and they were perfect. as far
as stock rods go i have them in my daily drivers that only get raced once in a while. do i trust them in my race car? hell no. any modern aftermarket rod has superior metal quality compared to 40 year old factory
stuff. also with stock rods who knows what abuse they were subjected to. were they in your grannys car
or in joe bobs race car?


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 Post subject: Re: 400/425 h beam rods
PostPosted: Tue Jul 10, 2012 1:30 am 
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Joined: Sun Mar 01, 2009 12:09 am
Posts: 906
Does Eagle make a big journal 7" rod? All the ones I have seen are 6.735".

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1966 F-85 Deluxe, 468 in³, TH400.


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 Post subject: Re: 400/425 h beam rods
PostPosted: Tue Jul 10, 2012 4:56 pm 
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Joined: Thu May 31, 2012 2:32 pm
Posts: 503
you are right. eagles website lists 6.735 by 2.5 bearing and 7.1 by 2.2 bearing. does anyone else make a 7.0 by 2.5 or could you offset grind your crank to 4.25 stroke with a 2.2 bearing? this requires a non stock
piston. do you already have pistons? just trying to come up with options.


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 Post subject: Re: 400/425 h beam rods
PostPosted: Tue Jul 10, 2012 6:14 pm 
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Joined: Thu Feb 12, 2009 8:53 pm
Posts: 4
Dic k Miller and Rocket racing have 7" rods for the 400 / 425. Eagle doesn't offer any. I was hoping for some feedback about the quality of the rods, I don't mind spending the money but don't want to have to buy the rods and put a lot into them to make them right. I will have to have custom piston no matter what rod I use.


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 Post subject: Re: 400/425 h beam rods
PostPosted: Tue Jul 10, 2012 6:56 pm 
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Joined: Thu May 31, 2012 2:32 pm
Posts: 503
i do not know the brand you are looking at in particular but most h-beams do not have balance pads and do
not need them as they are sold in weight matched sets. if you have a micrometer check them for roundness
yourself. your machine shop should only have to mess with the crank for balancing. you should always check aftermarket parts before installing them. my uncle had a scat stroker crank for a 351 ford that was
out of round and tapered. he found out the hard way after tearing the engine down and finding weird wear patterns on the bearings. my eagles required clearance grinding at the bottom of the cylinders. you should
do a mock up on your engine prior to final assembly. it would suck to find that too late.


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 Post subject: Re: 400/425 h beam rods
PostPosted: Wed Jul 11, 2012 7:48 am 
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Joined: Thu Feb 12, 2009 10:32 am
Posts: 265
Location: Wakeman, Ohio
M&J offers 7" H-beams with 2.5 rod journals. Not sure who the manufacturer is though. I think maybe Scat?

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'65 4-4-2
11.60 @115 mph


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 Post subject: Re: 400/425 h beam rods
PostPosted: Wed Jul 11, 2012 4:48 pm 
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Joined: Sun Mar 01, 2009 12:09 am
Posts: 906
66cutlass wrote:
Dic k Miller and Rocket racing have 7" rods for the 400 / 425. Eagle doesn't offer any. I was hoping for some feedback about the quality of the rods, I don't mind spending the money but don't want to have to buy the rods and put a lot into them to make them right. I will have to have custom piston no matter what rod I use.


I've used the H beams from CAT and Eagle. They are much stronger and nicer than stock rods which are the weakest link in the Olds rotating assembly. Though I do not like that they are offshore made, it's nice to know that by using the H beams you can forget about con rods as a source of failure for builds in the 500-650 HP range.

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1966 F-85 Deluxe, 468 in³, TH400.


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 Post subject: Re: 400/425 h beam rods
PostPosted: Wed Jul 18, 2012 9:30 am 
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Joined: Mon Apr 20, 2009 8:21 am
Posts: 246
68streetracer wrote:
i have eagles as well. my former machinist said every eagle rod he has ever seen was out of round and i would have to pay him 300 bucks to recon them. i checked every rod myself and they were perfect. as far
as stock rods go i have them in my daily drivers that only get raced once in a while. do i trust them in my race car? hell no. any modern aftermarket rod has superior metal quality compared to 40 year old factory
stuff. also with stock rods who knows what abuse they were subjected to. were they in your grannys car
or in joe bobs race car?


You need to get a new machinist. That guy is way expensive.

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'72 Cutlass Supreme Conv., Accel Mulltiport EFI'd 350, Performer RPM Air-Gapped, Erson Hyd Roller, 200-4R, 3.73 posi. Accel, AEM, Erson and Lunati Dealer


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