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Discussion Starter · #1 ·
Any opinions out there on Scat or Eagle forged 331 kits.
Both are the same price.Both are 4340 forged cranks with h-beam rods. Scat kit has probe pistons ,the Eagle has SRP`s.
The Scat is externally balanced, the Eagle is internally balanced.
 

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Have used both without a problem. Go with the internal balanced kit, Its better.
 

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Discussion Starter · #3 ·
What makes internally balanced better? Do you have a preference on pistons? Is the same damper used for either?
 

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Smoother operation and better harmonic control. Both pistons are fine for Street Strip use and lite NO2 use (under 150hp) I like the SRP's better but either is good. No Each needs a different damper.
 

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On quality of product you are probably good either way from what I have heard, but SCAT tends to be cheaper. All bow to the almighty $$.
 

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They are both made in China but the Scats are machined in America. Ive use both in winsors, I would buy a Scat(not Cat) before a Eagle. If you are pushing your block to the limits of breakage definitly buy the internal balance.
 

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Both Probe and SRP Pistons are made in the USA.
 

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Discussion Starter · #10 ·
This will be roughly a 450 horse motor. I want a good bottom end, this motor may have a decent shot of nitrous somewhere down the line. You know how the horsepower addiction goes.
 

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Sound like your on the right track for your goals. 450 hp is realistic and not to difficult to get. do a FT motor with about 10:1, a good hydraulic roller cam and a set of aluminum heads and BAM !! you got it !!
 

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Discussion Starter · #12 ·
My combo is going to be 10:1, AFR 185 heads and probably a solid roller cam, but possibly a large hydraulic cam. Victor JR intake, 650-750 cfm carb. This is going into a 1980 Mustang notch.
 

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Some of the high end SCAT cranks are USA made.

Callies, Bryant, HTC are a few others.

Most, if not all of the US made cranks are going to forged/billet pieces and not cheap.
 

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Scat and Eagle have cast and forged cranks that are equivalent. The forged ones are about $700 or $900-1000 for lightened ones.

Scat also has the 7000 series for $1000-1500. These can be custom ground for any combination of stroke and journal size. They are also available in a 'superlight' if you kept the bobweight around 1400gms or less.

Internal balance is better. On a 302 it was difficult with a heavy 1960's stock rotating assembly. Scat and Eagle are both offering it. However, most flywheel and damper offerings are designed for 28oz or 50oz balance. So, you need to make sure all the pieces match. And be careful about it the future wrong. Get it wrong, and you can find out about it in a very expensive way.

Callies, Crower, Byrant, and Kings all make high end cranks. US sourced materal. Some design characteristics may be a little better, especially with the Callies and Crower. More sophistication on where the weight is and the strength of the component. Callies also does an induction hardening, which is a deeper penetration. Around $1900-2100 for Kings. $2500-2700 for the others. In their lightest versions.

The cast cranks from Scat and Eagle, which are $250-300, are perfectly fine for most applications. My rule of thumb, over $5-7k engine, forged, over $12-16k engine, Crower or Callies.

IMHO,

David
 

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Eric is that you?
 

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Discussion Starter · #18 ·
I already purchased my kit.Thanks for your response though, it confirms what I bought. I ordered a forged Eagle crank ,Eagle h-beams, and SRP pistons. I heard from a couple of people and they all said to go with internally balanced, so I did. I also don`t have any intensions on emptying my bank account. I`m not looking to spend 10 grand on a motor.

<font size=-1>[ This Message was edited by: rcm600 on 3/16/06 2:22am ]</font>
 

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Sorry to chime in late here, but I'm not sure why you wanted a forged crank on a 450hp 331? If you're using a stock block (at the risk of sounding a bt like a know it all -/) you'll split it down the middle long before you break a 28oz balanced Scat 9000 series cast crank. And you won't be breaking either with 450hp if you assembled everything correctly. That crank, if balanced properly and with a good harmonic balancer is good to over 500hp, and over 7000rpm. I know this from experience lol, and trust me, I thrashed that car for over two years, pretty damn hard (mine was actually a 347).

Anyhow, sounds like you got some nice parts, and if you ever step up to an aftermarket block, you'll be able to use them to their full potential! =)

Cris

<font size=-1>[ This Message was edited by: Is1BadFord on 6/2/07 9:32am ]</font>
 

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Discussion Starter · #20 ·
This car will probably have a shot of nitrous in the future. Now I have provisions for that. What`s the sense buying cast parts, if I can buy forged parts for a couple hundred bucks more.
Why not? I plan on spinning it to 7000.
 
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