I’m looking to boost my gsr motor but I’m wanting to keep it pretty reliable and only go on low boost. It’s a p72 jdm gsr b18c with b18c5 pistons. My only issue is it has a good amount of blow by. Unsure if it’s from how old the motor is (been in the car for roughly a decade) but it only has 40k on the swap and I was just curious if I could keep it stock and run about 5 psi and be safe. It has s300 already aswell

 

do a compression test first before you start spending money

 

use an endoscopic camera and inspect the bores through the sparkplugs

 

If you have no compression, yeah sure, but if the motor runs and you are wondering about health, borescope isn't really going to tell you much if anything.