Help with building a bit more power in to the 318

If it were mine, i would just pull it & tear it all down, doing a leakdown will just pinpoint the problem, but it'll still need to be tore down anyways because water leaking in an engine most of the time is a bad & serious issue, plus you want to build it up anyways, tear it down to the last nut/bolt.

If you want 400 horses out of that 318 & do not want to stroke it, you'll need to spend some $$$, you need to get above the deck or have a quench dome piston to acheive close to 10.1 on a stock stroke 318 useing 360 open chambered heads, thats where the closed chambered magnum heads help, you can get there at or close to 0 deck & a FT, there are a few on these boards running really fast with "stock stroke" 318s.