I'm fairly sure that year of 302 has what Ford called "positive stop" rocker arms....i have a 302 and want to know how to adjust the valves. I tried to set them to zero lash at TDC and then turn it in 3/4 turn but they bottom at at that setting. what should they be set at?
This is the factory recommended method, however most of us don't have an assortment of pushrods to substitute, or even the tools to measure them.Adjustment is done with longer or shorter pushrods.
Very clever.:bow:This is the factory recommended method, however most of us don't have an assortment of pushrods to substitute, or even the tools to measure them.
Back when I was in high school and inherited a small block with worn heads, had them rebuilt for $225, then reinstalled them and faced with this adjustment issue, I came up with a solution. I used stacks of washers and the factory nuts to pull the rocker studs out, cut 1/4" off each stud bottom to make room at the bottom of each press hole (probably not required), then reinforced the studs by stacking nuts over the entire threaded length, and hammered them back in at 1/4" lower height. I then reinstalled the rockers and adjusted each valve assembly in turn, using a second lock nut to keep the correct height.
That trick served me quite well, since I drove the car another 85k miles or so before I sold it.
I have the same "checker" tool, rebuilt my 390 with rollers the same way that you did, ordered custom pushrods as well (Smith Brothers, $200 including shipping). However the tool I was referring to was the caliper long enough to measure the "checker". I used a tape measure to determine the length within 1/16", probably not precise enough to do the job unless you have an adjustable valve train. That's why my rebuild has adjustable roller rockers.Very clever.:bow:
These days the pushrod length checking tool and
different length pushrods are easily available.
Comp Cams and many other cam companies will have in stock,
or build you the pushrods you need for very reasonable prices.
When I built my 428CJ and converted to roller lifters and rockers,
I got a pushrod checker tool from Crane Cams and after determining the length needed,
I ordered the pushrods from Crane. I am using their roller rocker setup.
I don't remember now exactly what I paid... but the price of the custom pushrods was reasonable.