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wel i pushed 22psi on the t-28 that came with my gti-r motor. as far as i know we can push 8,000 before floating a valve. if you want better/more reliable valve trane then i would reccomend. i didn't have any problems after i did my big turbo. and i pushed 22psi on the stock bottom end. i did however pull the motor just as the gentleman from aus more for tuning than problems. there is a guy from florida, i don't know if he wants his name mentioned so i will respect him, that knows a trick to prevent the rocker arm and valve damage. and believe it or not it is simple.
ryan b. has a stock bottom end and is running over 20psi and made 392whp and has over 100k on his motor.

jimmy
1996 200sx gti-r motor
http://www.eiptuning.com/projects/200sxser1stpage.html
 

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yeah it is andre, but as dave said, i dunno if he wants his secrets all out in the open. so i respected his privacy and didn't open my mouth where it may have not been welcome. again as dave said if anyone wants to know i am sure he is a e mail away. i give alot of props to andre, i have spoken to him from time to time and he has helped me tremendously. so andre if i never said it before, thanks alot!!!.

jimmy
1996 200sx gti-r motor
http://www.eiptuning.com/projects/200sxser1stpage.html
 
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