how much rpm can a cast eagle cast crank handle?

[dbmx66]

i got an eagle cast crank for free. i wanted to throw it in a street/strip engine. nothing hardcore.

i have a forged crank in the c10. i dont know much about cast cranks, are they a waste of time? the motor is gonna be n/a, no turbo nitrous or super charge with about 10.5 compression. its gonna be for my lifted k10 we just picked up. i am planning on giving it some abuse. it is gonna be in a mud truck which will prolly see some higher rpms.

what are your opinions?

[Rodms]

Use it you won't have any problems,my machinist uses cast cranks in the big blown motors an says they work better than forged,and he builds the big ones.

[oldschool53_BBC]

It will work fine

[Marv D]

Cast and nodular iron is more 'forgioving' than a hard forged crank. Detonation wants to crack a journal out of a hard crank,, cast will 'flex' and survive.
That said, I used to repeatedly take a cast GM 350 crank to 7500 with heavy old TRWL2304f pistons, and a 250HP shot of nitrous. Riciprocating can be hard with RPMs, so a good balance job is a necessity.

In fact. not that I think about it, 10 yeats later that motor is still running with nothing but fresh rings and bearings.

[cableguy0]

I had a nasty little 355 with a gm iron crank in it. It regularly saw 7000rpm and never had an issue. Balancing is key with making any rotating assembly survive.