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[font=Arial, Georgia, "Times New Roman", Times, serif]Measured for pushrods
[font=Arial, Georgia, "Times New Roman", Times, serif]Prepped, cleaned the[font=Arial, Georgia, "Times New Roman", Times, serif] e[font=Arial, Georgia, "Times New Roman", Times, serif]ngine bay.
[font=Arial, Georgia, "Times New Roman", Times, serif]Ordered 6.300" 5/16' comp cams pushrod set of 16
[font=Arial, Georgia, "Times New Roman", Times, serif]So for hydraulic lifter GT[font=Arial, Georgia, "Times New Roman", Times, serif]40 heads with stock stamped steel rockers (1.6 ratio) a[font=Arial, Georgia, "Times New Roman", Times, serif]nd a performance camshaft you MUST measure for correct [font=Arial, Georgia, "Times New Roman", Times, serif]pushrod length
[font=Arial, Georgia, "Times New Roman", Times, serif]To do so you can order an ad[font=Arial, Georgia, "Times New Roman", Times, serif]justable pushrod from your fav speed shop / cam builder.
[font=Arial, Georgia, "Times New Roman", Times, serif]Comp cams sent me this chec[font=Arial, Georgia, "Times New Roman", Times, serif]ker, it worked out just fine.
[font=Arial, Georgia, "Times New Roman", Times, serif]Checking pushrod length with hydraulic roller lifters and pedestal mount style rockers,
[font=Arial, Georgia, "Times New Roman", Times, serif]You want to see two things:
[font=Arial, Georgia, "Times New Roman", Times, serif]1. Wear pattern is in the center of[font=Arial, Georgia, "Times New Roman", Times, serif] the valve stem tip
[font=Arial, Georgia, "Times New Roman", Times, serif]2. Wear pattern width is between .007 and .009 thousands of an inch (so 0.008 is[font=Arial, Georgia, "Times New Roman", Times, serif] perfect)
[font=Arial, Georgia, "Times New Roman", Times, serif]Basically with the stock rockers going back in I can already see where the wear patter[font=Arial, Georgia, "Times New Roman", Times, serif]n should be on the tip of each rocker arm is a worn shiny spot
[font=Arial, Georgia, "Times New Roman", Times, serif]The test:
[font=Arial, Georgia, "Times New Roman", Times, serif]- Using the stock pushrod, mount the pedestal rocker NEXT to the valve you are working[font=Arial, Georgia, "Times New Roman", Times, serif] on, this keeps the pedestal tray centered for your test
[font=Arial, Georgia, "Times New Roman", Times, serif]- Clean and lube the stock pushrod both ends, install into lifter bore.
[font=Arial, Georgia, "Times New Roman", Times, serif]- Mark the valve stem tip, dry erase marker, sharpie, I used some copper anti seize.
[font=Arial, Georgia, "Times New Roman", Times, serif]- Turn engine over (15/16 socket on crank bolt, clockwise) and make sure lifter in[font=Arial, Georgia, "Times New Roman", Times, serif] question is set on the base circle of the cam
[font=Arial, Georgia, "Times New Roman", Times, serif]- Install rocker arm and adjust by [font=Arial, Georgia, "Times New Roman", Times, serif]hand to zero lash
[font=Arial, Georgia, "Times New Roman", Times, serif]Zero lash means you can barely turn the pushrod anymore with your fingers.
[font=Arial, Georgia, "Times New Roman", Times, serif]- Now with torque wrench set to 18-20 ft lbs (19 ft lbs for me)
[font=Arial, Georgia, "Times New Roman", Times, serif]-Finally you want to make sure you reach your torque valve within 1/4-1 full turn of the r[font=Arial, Georgia, "Times New Roman", Times, serif]ocker retainer bolt (torque wrench)
[font=Arial, Georgia, "Times New Roman", Times, serif]-Turn the engine over 2 full revolut[font=Arial, Georgia, "Times New Roman", Times, serif]ions, your valve should open and close twice
[font=Arial, Georgia, "Times New Roman", Times, serif]-Remove rocker arm, check size and location of wear pattern
[font=Arial, Georgia, "Times New Roman", Times, serif]For me with the stock pushrod it took almost 2.5 turns of the torque wrench to reach 19 ft lbs, also the pattern was down low of center on the valve stem
[font=Arial, Georgia, "Times New Roman", Times, serif]The result is we need longer pushrods
[font=Arial, Georgia, "Times New Roman", Times, serif]Out comes the adjustable Comp cams unit adjusted until it was 6.3" long and put tape over the threads so it wont move during testing
[font=Arial, Georgia, "Times New Roman", Times, serif]Clean the valve stem and rocker arm, re apply marker on valve stem, lube the adjustable rocker arm and repeat the test
[font=Arial, Georgia, "Times New Roman", Times, serif]Guess what, perfect wear pattern,[font=Arial, Georgia, "Times New Roman", Times, serif] 0.008 wide and smack dab in the middle of the valve stem
[font=Arial, Georgia, "Times New Roman", Times, serif]Checked 3 more valves (2 on eac[font=Arial, Georgia, "Times New Roman", Times, serif]h bank)
[font=Arial, Georgia, "Times New Roman", Times, serif]Confirm I need 6.3" long pushrods, ordered from Amazon
[font=Arial, Georgia, "Times New Roman", Times, serif]Proper rocker arm geometry is ESSENTIAL to getting full performance from your engine (and making full manifold vacuum) Anytime you change hea[font=Arial, Georgia, "Times New Roman", Times, serif]ds, install a cam, etc you MUST MEASURE pushrod lenght!! every engine build is different.
[font=Arial, Georgia, "Times New Roman", Times, serif](with that said most gt40 builds with a performance cam will result in stock length or on length longer being the perfect fit so 6.25 or 6.3")
[font=Arial, Georgia, "Times New Roman", Times, serif]Pics, stock pushrod 6.25"
[font=Arial, Georgia, "Times New Roman", Times, serif]I have my ways
[font=Arial, Georgia, "Times New Roman", Times, serif]As good as it gets with stamped rockers, dead solid perfect:
Last edited on Sun Sep 22nd, 2019 03:28 pm by Eddie Money
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