[steve25]

Any one have Jim Hands book to post up how much abuse a 455 crank took that he has fail that he talks about?

I will do so later if no one else does, but the amount of time it took of getting beat on was astounding before it gave out!

With lighter reciprocal parts getting use in builds these days I would say 650 is where I would draw the line in being very safe as long as your not planning to race the motor every weekend for 2 seasons.

Prepping the crank ( polishing the crap out of it) will make a huge difference in longevity as will cryogenic treatment if theres a location close enough to drive it to.

Tuning for no detonation I am considering a given.

The SD455 acording to the engineer who designed it was made to run day and night at 6000 rpm with a good margin of safety, and these motors left the the factory with a cast crank, so just putting that out there.

[srmmmm]

Originally Posted by steve25

With lighter reciprocal parts getting use in builds these days I would say 650 is where I would draw the line in being very safe as long as your not planning to race the motor every weekend for 2 seasons.

Prepping the crank ( polishing the crap out of it) will make a huge difference in longevity

.

This was my thinking in my build as well. With an Eagle cast 4.25" crank in my 350 block, I'm not at the extreme power levels discussed. But feel confident in it's durability at my 453HP because of the lighter pistons. And as you mentioned, I did have the crank polished as an extra measure.

[hurryinhoosier62]

Originally Posted by steve25

Any one have Jim Hands book to post up how much abuse a 455 crank took that he has fail that he talks about?

I will do so later if no one else does, but the amount of time it took of getting beat on was astounding before it gave out!

With lighter reciprocal parts getting use in builds these days I would say 650 is where I would draw the line in being very safe as long as your not planning to race the motor every weekend for 2 seasons.

Prepping the crank ( polishing the crap out of it) will make a huge difference in longevity as will cryogenic treatment if theres a location close enough to drive it to.

Tuning for no detonation I am considering a given.

The SD455 acording to the engineer who designed it was made to run day and night at 6000 rpm with a good margin of safety, and these motors left the the factory with a cast crank, so just putting that out there.

Steve, I am glad people are finally discovering the cost effective nature of cryo treating engine components. We here in IN are blessed to have Indy Cryo in Indy. Nitriding is another process I recommend.