How far can I run with the stock headgasket? I just replaced it about 10,000 miles ago.

I'm about to put have a built head installed on my car. Should I replace it or will it be fine?

I'll be going for 375-400whp.

 

some people swear by cometic, and inline pro, i have a cometic only because i have an 84mm bore b16. proper tuning is the key. i think a stock headgasket should hold it. but i have no experiences above 300 whp to back that up. my last engine held up to 280 whp. from there and above i cant say.

 

oem is good up to 35psi

 

the headgaskets are not the issue when building a motor
its the fact that bolts and studs stretch and make the contact between the head and the block loose the torque wich will cause separation and when that happens the gasket its exposed and then it burns or brakes (blown headgasket)

 

Hooray for my ARP head studs then.