Small block Fords produced before 1967 had adjustable rockers like Chevy. The later Ford small blocks didn't have the adjustment designed into the head. Some factors can and will affect the pre-set adjustment, these are:<br>The amount removed from a decked block<br>The amount removed from a milled head<br>The amount of material removed from valves and stems.<br>The amount of material removed from valve seats.<br>How thick your head gasket is. <br><br>On engines where an adjustment is necessary on a stock motor equipped with non-adjustable rockers, you will need to purchase oversize or undersize pushrods. I didn't like that method when I put together my '73 302 in my pick-up truck so I went and got 16 grade-8 flat washers that were about .060" thick, and 16 grade-8 5/16" fine thread nuts. and I put the washers between the fulcrum and the stock nut, adjusted the valve lash to my liking then used the new nuts on top of the stock nuts and jambed them together like you would a poly lock. This was something for me that was strictly experimental but the motor now has 60,000 miles and not so much as a whimper out of it. <br><br>Note: Poly-locks can stick up so high that your stock rocker covers won't clear the height, so in many cases you will need to get taller aftermarket covers. This is why poly-locks are worthless for my purposes.<br><br>BH<br><br><br>
Thanks again.
