rarerodder
Active Member
Scat or Eagle 4" crank and why? What makes one better than the other?
Scat or Eagle?
- Thread starter rarerodder
- Start date
That has been my experience as well, too many "re-do" finish machining issues with Eagle.
Can't vouch for Scat, but was disappointed with my Eagle crank.
On mine, the front area of the snout was not machined, the correct distance from the block. First problem, my crank gear would not go on, all the way.
There was a slight high spot, preventing it from going any further. After some careful filing, it went all the way on, and seated..
Then, the HB could NOT, go on far enough, for the pulley's to line up.
I had to use, a newer SBC balancer, with a corresponding timing tab, from Show Cars. Still, my machinist had to remove 1/4" off the hub, on the balancer, for the upper and lower pulleys to line up.
I probably, Should Have Checked this stuff, Before assembling the engine, But 
. I guess, spending close to $ 800.00 doesn't mean, you will get a perfect crank.
On mine, the front area of the snout was not machined, the correct distance from the block. First problem, my crank gear would not go on, all the way.There was a slight high spot, preventing it from going any further. After some careful filing, it went all the way on, and seated..Then, the HB could NOT, go on far enough, for the pulley's to line up. I had to use, a newer SBC balancer, with a corresponding timing tab, from Show Cars. Still, my machinist had to remove 1/4" off the hub, on the balancer, for the upper and lower pulleys to line up. I probably, Should Have Checked this stuff, Before assembling the engine, But . I guess, spending close to $ 800.00 doesn't mean, you will get a perfect crank.
I remember this topic came up on the Speedtalk site where lots of engine builders post.
The consensus was that if the price was similar, go with the Scat. As others have said, the machining is more likely to be OK on the Scat.
They also said, no matter what you get, you've get to check it.
The consensus was that if the price was similar, go with the Scat. As others have said, the machining is more likely to be OK on the Scat.
They also said, no matter what you get, you've get to check it.
troublemaker427
Well Known Member
In the FE Ford world Scat is by far the preferred choice. I've heard a few Eagle horror stories. I'm not sure if this crosses over to W-motors but my guess is it does.
Sounds like a real 409 crank is the best bet.
Ok. So my engine was built by Jack Gibbs. He used a 454 crank. Only thing I don't like about it is the external balance.
My question is, comparing Scat, Eagle, and a GM big block crank, how does the GM crank stand up to the others ?
Just curious.
My question is, comparing Scat, Eagle, and a GM big block crank, how does the GM crank stand up to the others ?
Just curious.
I think the 409 stroker cranks by Eagle and Scat are made from 4340 steel and they're internally balanced, so they're plenty strong.
I'm sure a factory 454 crank is also quite strong but I don't think it would be stronger that the Scat or Eagle forged cranks.
I'm sure a factory 454 crank is also quite strong but I don't think it would be stronger that the Scat or Eagle forged cranks.
Both Scat and Eagle are made of better material than an original crank. Have yet to see an Eagle crank that didn't need to be ground .010/,010 out of the box. (Always taper on the journals) Scat is better, but they have to be checked carefully also. I wouldn't put money into a GM crankshaft.
I would take one of them over the other two.
61 Bubble
Well Known Member
This is a sorta funny thread! MOST on here will never have a need for a 4340 steel crank? In fact most would "probably" be better with cast OEM or aftermarket? More forgiving we have found then most steel cranks. OEM crank would be fine for about 85% of the people on here! Infact my stroker 409 I bought off Jim IS OEM crank. And this motor went low 10's in Jim's car, 10.32 I think was what Jim quoted me. So gotta be making in the 550-575Hp range. There are plenty of BBc that make far more than my 409 does with their OEM cranks, PLUS runs at RPM that 99% of 409 would crack just talking about those numbers.
Jim is correct, once the $$$ is roughly the same, go with the Scat. BUT there is a new player in this market, Molnar. Just not sure he does one for a 409 though? The problem I think is the cost of machining to get the OEM cranks to fit the 409.
So one must ponder the intended usage of the motor/car? Once that is determined the RIGHT decision on crankshaft material, size and quality can be made. Till those factors are know, it's a moot point really.