Why is this forged crank so cheap?

[thedriver]

Anyone know anything about these cranks?

They are only $300. Are they anygood. I'm looking to buy a forged crank but don't want one that is crap.

MIke

 

[bluevenom867]

Because it's a 5140 forging.It's a different type of alloy than the typical 4340 found in most forged cranks.It's not as strong as the 4340, but still better than a cheap cast.

 

[giddyup306]

A cast crank will do for most motors.

 

[thedriver]

Yeah, I know the cast ones are strong but I'm building a motor with boostand plan to make 500-600 hp. if I can get a forged crank for $300 then I think it would be wrth the peice of mind if nothing else.

 

[5.0 Nostalgia]

I think I would buy a better crank. I don't trust a lot of what you see on ebay. What blue venom said is correct, it's a cheap forging.

 

[Michael Yount]

The surest way to spend MORE money is to buy cheap parts the first time. Be absolutely certain what you're buying.

What kind of block are you gonna be using? The stock crank will hold up longer than the stock block will - at the HP levels you're speaking of, many people have split stock blocks through the lifter valley. And when that happens, it often takes all the rotating bits with it. So if it's peace of mind you're after at 600 HP, you'd best buy a better block before you start worrying about the crank.

 

[giddyup306]

Yeah, I know the cast ones are strong but I'm building a motor with boostand plan to make 500-600 hp. if I can get a forged crank for $300 then I think it would be wrth the peice of mind if nothing else.

On one of my motors I plan on having 700+ and still use a cast crank. I beleve some of the scat cranks are rated at 850.

 

[thedriver]

The surest way to spend MORE money is to buy cheap parts the first time. Be absolutely certain what you're buying.

What kind of block are you gonna be using? The stock crank will hold up longer than the stock block will - at the HP levels you're speaking of, many people have split stock blocks through the lifter valley. And when that happens, it often takes all the rotating bits with it. So if it's peace of mind you're after at 600 HP, you'd best buy a better block before you start worrying about the crank.

I have a stock 97 block that is being fully preped. by prepped I mean all the casting marks, and flashing has been removed, the sharp edges have been radiused, holes chamferd, the block is being align honed decked, ect. The motor will be blue printed as well.

This is my first 302 build. I've had a modarate built 351c.

I was under the impression the blocks could handle the power. I have seen others claiming that much on stock blocks. Is this not true? What is the hp limit of these blocks?

Mike

 

[Michael Yount]

Mike - there's not a firm and fast rule. You'll find folks out there that put down 500 rwhp or slightly more no doubt. But when you start digging around, that's the level at which people also start breaking blocks. The question that should go along with 'how much power did you make?' is 'how long did it last?' If you search the threads, what most folks will tell you is that when you start to approach the 450-500 rwhp level with a stock block, anything can happen. I wouldn't invest all the money necessary to make that kind of power with the chance that the block would let go and take my expensive parts with it. If you're serious about that kind of power level, you need a stronger block if you want to make the power reliably.

 

[giddyup306]

Yeah Bennett Racing rates the stock blocks at 450fwhp. I personally wouldn't go any farther than that.