[STUD MOUSE 82]

can someone tell me what is the max rpms for a 69-70 350 chevy forged steel crank..10/10

[bigbadbowtie]

That 10/10 GM 1053 steel crank will take 7k rpm and 650 HP for a LONG time when well balanced and matched with good parts.

[CNC BLOCKS NE]

Originally Posted by bigbadbowtie

That 10/10 GM 1053 steel crank will take 7k rpm and 650 HP for a LONG time when well balanced and matched with good parts.

We buy a lot of GM cranks machined by http://kingscrankshaft.com/ and he buys the rough forgings and index them and uses an 1/8 radius on the jornals and rates them at only 500 horse and the stock crank with a small radius you rate at more power HMMMM

We have two 1182 cranks in the shop that are cracked in the radius and they were not even close to 650 horse.

[machine shop tom]

Another thing to look at is the crank snout. I have seen a lot of these with little or no radius where it meets the front main journal. Not something to be used with heavy accessory belt loads or forced induction. Plus these cranks are prone to cracking when over-stressed. Just like CNC said.

tom

[bigbadbowtie]

maybe I have a time bomb on my hands....
Im not using forced induction but it gets its share of gas.

[machine shop tom]

Originally Posted by bigbadbowtie

maybe I have a time bomb on my hands....
Im not using forced induction but it gets its share of gas.

A blower is forced induction.

tom

[johnsongrass1]

I wanna know how you get 650hp at 7K on a 3.48 crank.

[bigbadbowtie]

I never had the car on a dyno but the car weighs 3440 and trapped 128 in the qtr. Hp calculator....says 630 to 645 at the crank.

Thats from a roller 355 with 175 jets.

Ill be quiet from now on.....

Johnson... I should have stated.... should live at the 650 Hp mark and be able to spin 7k.