I have a semi-built b16 (cp pistons/eagle rods) and I am planning on boosting around 13-15 psi. Will stock valves hold up to that? Or will the temperature be too great and spell bad news for my valvetrain? Thanks

 

my stock engine has been holding up fine

 

It may work okay but if you've got a built bottom end why not at the bear minimum just add valvesprings? It's really up to you and the money but I personally would just do everything... Even with built stock sleeved FI motors we've NEVER done a single one with a stock head, actually every single one we've ever done has been from Portflow with aftermarket valvetrain so I don't really have any experience... Just my $0.02, Good Luck

 

my b18c ran good with totaly stock head/valvetrain at 16 psi

 

stock valves should be fine. I run them in mine, over 400whp. but valvetrain is is a great idea. I run Crower.

 

i run stock valve train and 17 psi daily. i try not to push it though...but if she blows...there's another head with full crower on