Hello!One more question: What valve clearance should it be in a 289 enginge -66 (intitial settings)
hydraulic lifters.... do you have adjustable rocker arms????i usually set hydraulic cams with adjustable rockers 1/4 turn more than ZERO lash... but this gets complicated... there is a specification of when both lobes of the cam are on the base circle... top of compression stroke/beginning of power stroke..do you see that ZERO lash on the left lifter below has not pushed the blue colored socket down away from the circlip..but some preload on the right has pushed it down slight.. but NOT bottomed it out...some years of engines have NON ADJUSTABLE stepped rocker arm studs... where the smooth part is 3/8" and the threaded is 5/16" it takes a special spacer and a METAL self locking nut to attempt this... do not use NYLOCK nuts.. poly locks were also available for these...to get to the proper location.. please mark the harmonic damper 90 degrees apart.. following the firing order...then find #1 tdc compression stroke... passenger side front.. and then turn the crank 90 degrees and adjust the next one... then another 90 and the next one... so on...mechanical lifters with adjustable rocker arms... use feeler gauge.. again 90 degree turn... and again and again...2 whole turns of the crank... equal 8 quarter turns...
This procedure for the 289 and early 302 V8 engines is designed for engines in which the rocker arm mounting studs do not incorporate a positive stop shoulder on the mounting stud. These engines were originally equipped with this kind of stud. However, due to production differences, it is possible some 289 or early 302 engines may be encountered that are equipped with positive stop rocker arm mounting studs. Before following this procedure, verify that the rocker arm mounting studs do not incorporate a positive stop shoulder. On studs without a positive stop, the shank portion of the stud that is exposed just above the cylinder head is the same diameter as the threaded portion, at the top of the stud is of greater diameter than the threaded portion, this identifies it as a positive stop rocker arm stud and the procedure for the 351 engine should be followed.Crank the engine until No. 1 cylinder is at TDC of the compression stroke and the timing pointer is aligned with the mark on the crankshaft damper.Scribe a mark on the damper at this point.Scribe three more marks on the damper, dividing the damper into quarters (see illustration).With mark A aligned with the timing pointer, adjust the valves on No. 1 cylinder by backing off the adjusting nut until the pushrod has free-play in it. Then, tighten the nut until there is no free-play in the rocker arm. This can be determined by turning the pushrod while tightening the nut; when the pushrod can no longer be turned, all clearance has been removed. After the clearance has been removed, tighten the nut an additional 1 / 4 of a turn.Repeat this procedure for each valve, turning the crankshaft 1 / 4 turn to the next mark each time and following the engine firing order of 1-5-4-2-6-3-7-8.