to last for a while, and i didnt want to push it to 22/24psi due to the fact that i have a new OEM long block.. I know the OEM long blocks are strong but i am very happy with the results of only 20psi. Also, by me adjusting the WG it helped and we know that the WG that JWT supplies with the 530bb are good all you need to do is adjust them to 14/15psi and they WILL hold 24psi. But yeah Josh is right the conservative tune. Thanks for looking.