Sbc Crower crank repair

[mdabbott2009]

Can anything be done with this crank
Looks to have stress cracks in 3rd main journal

It's a crower ultra light small journal 3.75 stroke in 13/1 406 spins it 82-8400 550/ lift class oem heads any porting etc

[In-Tech]

https://marinecrankshaftinc.com/

[Mummert]

Call and talk to Pete Harris at Crower, he's the man. Might be able to grind it .010" and re nitride it. I looks like surface checking from heat probably fixable.

[Bigchief632]

Might have to go down to 1.88 journal to get through the cracks. But as said, I would call Crower direct.

[1972ho]

Also mile high crankshaft repair check there sight.

[mdabbott2009]

Thanks guys

[Baprace]

Can anything be done with this crank
Looks to have stress cracks in 3rd main journal

It's a crower ultra light small journal 3.75 stroke in 13/1 406 spins it 82-8400 550/ lift class oem heads any porting etc

mdabbott2009 If that is my engine or build , I would get a new crank , it's showing you that it is DONE and you are just lucky it is still in one piece , why take a chance on either spending money for repair and losing your engine versus spending $1300.00 ( just an approx price ) and have a NEW unstressed crank , your used crank is already a lightweight stroked crank that has had the living hell beat out of it. That type of crank has a lifespan and it appears you have found the limit. JMO

[In-Tech]

Can anything be done with this crank
Looks to have stress cracks in 3rd main journal

It's a crower ultra light small journal 3.75 stroke in 13/1 406 spins it 82-8400 550/ lift class oem heads any porting etc

mdabbott2009 If that is my engine or build , I would get a new crank , it's showing you that it is DONE and you are just lucky it is still in one piece , why take a chance on either spending money for repair and losing your engine versus spending $1300.00 ( just an approx price ) and have a NEW unstressed crank , your used crank is already a lightweight stroked crank that has had the living hell beat out of it. That type of crank has a lifespan and it appears you have found the limit. JMO

Hiya,
You're not going to buy a Crower crank for $1300. In my opinion, those are not stress cracks but instead, heat cracks. Stress cracks usually show in the radii. Have the crank fixed, loosen up your clearances .0005". Think King allecular bearings, use a thicker oil and better cooler. I hope at that rpm it is already dry sump or very short tracks. Crank surface shows "trash" has been run though, I would bet you are using a tri-metal bearing and it just started scuffing and here's what ya got

[Chris_Hamilton]

Also mile high crankshaft repair check there sight.

Member here had a bad experience with them. VortecPro IIRC.