how much power you running on stock bottom end

[mitch terry]

got a fg barra and just wondering how much rwkw can a stock bottom end take, got 420rwkw with a unopened  bottom end and haventnoticed anything wrong with it.

[k31th]

you're on a hiding to nothing running that much power on a stock bottom end; it could pop at any moment... have seen them go over 500rwkw but they don't last long at anything above say 330rwkw... but "unopened" is different for different people, e.g. valve springs and head studs and oil pump gears etc are all things people change and call it "unopened" which can and will run higher than 400 for quite some time.

[TRYME]

Is it 420rwkw on 98 or E85? 
My fg f6 motor stock bar valve springs was making 500rwkw on E85 for a few years... when engine was torn down (engine was fine just building for big power) I was told motor looked quite healthy.... there's a lot of variables at play though some people have popped them with 400s whereas some people have run mid 500s for a long time 

[Tom Tucker]

400kw on e85 is fine.

On 98 not as fine  but probably ok if everything is undamaged previously and maintained properly. Bit of detail associated with turbo frames, tuning etc

[Puffwagon]

Yerp you bring that 500+ above 5000rpm while the rest is well under that figure, you'll be fine.

 

You try and full send it as soon as it can, you'll kill it.