440 Redline?

[drobertson]

Hey all. I've got myself a cast crank 440 from a 1974 C-body I bought for $150. My plan is to rebuild it with at least 9.5:1 compression and a few upgrades. What would the safe rpm limit be for a cast crank 440? I have heard from a few people that a steel crank can be revved up higher, and a cast crank shouldn't be taken over 4k rpm. Additionally, my goal for the engine is at least 400-500 hp. Will a cast crank hold up with that? Thanks.

 

[kjalltrac]

I rew my cast crank/piston 440 76´ 6000-6200rpm all the time, It just loves it:hello2:.
8,5 comp, ported 452 heads, comp xe 284 cam with stock rockers, rpm intake and headers.
I believe I´m at 380-420 hp. Just got a NOS sniper kit and planning on 150hp shot this season.

 

[Dennis H]

Chasis Dyno says mine stops pulling at 4850. 415 RWHP.

 

[terzmo]

I got the best response at 5400..anything past was a waste of time for the power generated

 

[lewtot184]

Chasis Dyno says mine stops pulling at 4850. 415 RWHP.

my 400hp 6pak engine went flat between 4300rpm and 5300rpm. fell off the cliff at 5300rpm.