I posted this on LT1 Tech whith limited response. I thought I would try here.

Ok, here's the deal... I have a Summit cast 383 crank that broke at the front main journal. I believe this happened because it was improperly balanced or the stock harmonic dampener (which was drilled from the factory) slipped or was not included when balanced.
Anyway, I'm going to replace it with a cast crank because I don't feel I need to go with forged. I would like to hear good and bad experiences with cast cranks.

My machinist prefers the Eagle cast crank over the SCAT 9000. I will not be going with another Summit crank.

Any opinions on the quality of the Eagle vs. the SCAT?

 

My engine builder found my Scat harder to balance than Eagles but it turned out ok.

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'93 Camaro Z28 Automatic with a ZL1 hood.
No bottle.
No blower.
383 cubic inch serving of horsepower...hold the rice please.
Thats all you need to know.
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Gripenfelter's Homepage

Disclaimer: The opinions expressed by me are not necessarily supported or indicative of the Government of Canada or any other Federal Employee.

 

Hmmm, that's interesting! SCAT's website says they make their "Knife Edged Counterweights profiled for Ease of Balance"

I guess their design isn't so easy to balance after all.

Thanks for the info

 

I had the Scat crank on my N/A 383, and it worked great. The motor saw 7000rpms several times with a CC306 , and made ~460rwhp. I also used the Scat I beams, and they held up great also.

Jose

 

32K miles - no probs.

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"In Visa We Trust."

"Real men drive opposite lock."

 

My Scat 9000 383 crank has held up to several 7000 RPM blasts with no problem.

 

Yeah, but that is just because your car is slow.

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'94 Black Z28
A4->M6 Swap
K&N CAI
Flowmaster cat back
High flow cat
Edelbrock Headers

Soon to Come-LT4 Hot Cam

 

Just wait for the 200 shot to go on. Then will 9's be slow?