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Re: stock crankshaft- 420a
You may just want to make sure the crankshaft is balanced when doing a rebuild, but the stocker is fine for about 8k rpm and ~400hp or so IIRC. Even then, it could still probably hold up to even more. Cranks are strong... they have to be. As Silver said, the rods/pistons are weak. They're moving all over the place and held into position by basically one part. The crank on the otherhand is held on by basically the whole engine. And unless you have a 7-bolt, isn't going anywhere.
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2013 Chevy Sonic 1LZ
Daily Driver, 1.4L Turbo, 6spd
75 Monte Carlo
SBC 400 6.6L, Aluminum heads, Hurricane Intake...
12 Chevy Sonic 1LZ 1.8L - Traded
01 Pontiac Grand Am SE - RIP
95 Eagle Talon ESi-T 5spd - RIP
88 Oldsmobile Cutlass Ciera- RIP
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