383 OWNERS , cast or steel who has what?

[LD85]

I know this is dependent on RPM and Money, whom has what cast or Steel? Is steel an absolute necessity? I will not be turning more than 6000 RPM. [Modified by ld85, 8:42 AM 11/5/2002]

[Lt1er]

You can buy low end forgings from Scat or Eagle for much less than $500. either in 5140 or 4340 steel. From what I've seen and understand. Get the crank setup for internal balancing so you don't have to run a balancer and flywheel/flex plate as a matched set.

[71roadster]

I am installing a Scat 9000 cast unit for the one piece seal block. It is supposed to be able to be internally balanced. I am having the machinist balance it when the rods and pistons arrive. I got the crank from flatlanderracing.com who drop shipped direct from scat. I paid only $200 for the crank. Everyone says these cranks are good to at least 6500 rpm and higher depending on the weight of the pistons and rods.

I remember seeing somewhere a comparison of strength between cast, the scat 9000 type cast, and forged. The 9000 series was just a little less strong then forged while the cast was a lot less strong then either.

Chris


[Modified by 71roadster, 10:36 AM 11/5/2002]

[74vetteman]

From what I've read, this is the order of strength, from weakest to strongest

-Factory cast iron
-Scat cast steel and factory forged 1053 are about equal, with a new factory forged maybe a little stronger
-4340 is strongest

There are some other alloys out there, but these are the most common. There is some debate whether 4340 non-twist forging, or 4340 billet is stronger.

[gtsyellow]

a few very very VERY bright engine builders have told me the scat 9000, cast steel crank can live at 800hp in a drag racing enviroment quite well. so far neither have seen one break on a SBC. i personally spin mine to 6900rpms & have never had one slight issue. i'm fairly confident this crank could spin 7500rpms & not have issues. internal balance is a must but they make it easy. now everyone kick me for not buying the 383 crank for $50 more. :lol:

[LD85]

I agree, I saw some rally good Scat 9000 prices at Flatlander.

Looks like a stroker is in the cards.

All I am looking for a real low 13's or high 12's car !

[Neil350]

I used a 385 stroker kit from Performance Automovtive Warehouse, The kit came complete balanced with forged pistons, custom grd crank, piston rings, balanced, with crome moly rod bearing for about $650.....I'm running about mid twelves. On pepboys tires! If you wanna know what else I got send me a PM, or drop me an email!

[madvette74]

what about nodular iron??? stonger than cast..

[LD85]

Sorry dudes, my plans have changed. I am now building a 406 but this info is still helpful!