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Old 04-17-2006, 10:07 PM
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forged crank question

I know they exist different kind of crank, i already see on internte those forged crank, 430 - 4340- 5130, but it's the first time I saw a crank like this: #7416-------454, 502---forged, cross-drilled, 1053 steel.

My question is, this is a good crank, what will be the max HP this crank can take.....4130 crank can take around 1000 hp,
4340 probably more
5130, I really dont know how many Hp
and finally this crank 1053.....

Can somebody are able to help me...

I have a 468 CI and will put dome forged piston to raise up the CR to 11.00 and plan to use 200 hp of nitrous, I want a good crank, but dont want to pay 600$ for a crank.

Thanks in advance, stephane

Chevy man forever!
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Old 04-17-2006, 11:22 PM
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Well Stephane, I don't know if I'm going to be of much help, but it was fun researching your question. I never got involved with the chemical composition of metals, even though my father was a tool & die maker and knew all that stuff. I did manage to pick up some of the qualities of different metals and how to machine them and measure them from him.

It appears that the different numerical designations indicate the recipe of the steel.

For instance, 1053 would be made with....
0.48-0.55 % carbon
0.70-1.0 % manganese
0.05 % max sulphur
0.04 % max phosphorus
0 % chromium
0 % nickel
0 % copper

whereas 4340 would be made with....
0.40-0.45 % carbon
0.75-1.0 % manganese
0.04 % max sulphur
0.035 % max phosphorus
0.15-0.35 Sl ???
0.80-1.10 % chromium
0 % nickel
0 % copper
0.15- 0.25 % molybdenum

I'm not sure, but I think the first number 4 indicates the presence of molybdenum and the second number 3 indicates the presence of chromium.

Like I said, this is probably not much help, but maybe a metallurgist will happen along and help both of us.
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Old 04-18-2006, 04:50 AM
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techinspector1... Good breakdown of the metal composistion...

A 1053 crank is what GM makes for its HP apps... It should take around 700-800 horse power if the engine is assembled correctly and balanced... The 1053 crank was what the older LS-6 & LS-7 crate engines were based on...
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