[Rev]

I used 351W heads for several years on my street driven 306. I had them pocket ported and gasket matched with a 3 angle valve job. Even though screw in studs are better, I used the original pressed in studs with Comp Cams Magnum roller tipped (not full roller) 1.6 rail rocker arms (no guide plates needed). I did also use poly-locks to make them adjustable and to hold that adjustment. At that time my engine made about 300 HP and reved to 5500 RPM. The heads worked well on this fairly mild 306 engine.

It wasn't until I went to TFTW heads with a bigger cam and intake that I used the full roller rockers. That's when I felt the need the better valve train. At least, that how I experienced it.

Rev