On a turboed Honda, how much HP can the stock valves hold? Basically in my build this winter, I am working on a GSR motor that has forged pistons and connecting rods, and Stock sleeves. My head will be Ported and polished with dual valve springs and retainers. But the valves, will the stock honda valves be my weak link or will they hold just fine for the motor build I am looking for. I will be happy at 350ish HP. And also too, i will have an AEM EMS. ANy help, to replace the valves or just maybe get them a valve job? Whats best? I would rather not cut corners, but I also don't want to waste money if its not necessary.

 

i've made 535whp so far(soon to be more)with stock itr valve train

 

the only thing i would beworried about is the stock valves being to small and too heavy. i have never heard of too much hp breaking a valve

 

you will be fine with a stock head.

we have made over 600hp on a stock head

 

i think the heat would be a bigger concern, no ??

ive seen completely stock cars that had burnt valves.

 

Using stock valves on 410 whp

 

they can handle up to around 1700 FLWHP

 

I cracked a stock GSR retainer once, and dropped a valve But, that was a highway run with a crotch rocket.

I would do springs and retainers

 

aftermarket springs and retainers and your good to 9-10k on stock valves too

 

Great!! all of your info will be very helpful.