360 pushrods
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Joined: Nov 2003
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From: Lafayette,Ga
Thanks rusty70f100! I just bought this truck and the valves/lifters are making a lot of racket. I checked the rockers and am replacing the rocker shaft. However,some of the pushrods have almost a 1/8 in. clearance between rocker tip. There is a lot of wear on the rocker shaft and it looks like the pushrods have some wear also. The pushrod lenght in this engine are 9.625 in. Does that sound like the right pushrod? Checked lift on cam today and found lift to be app. 0.250 in. How much should I be able to depress lifter to determine proper lenght pushrod? Sorry I have so many questions. but this second F-100 I've ever owned. Priced this last one just as I was getting ready to start body work and the guy bought it. The truck I have is a 71 F-100 Sport custom w/ all gauges, factory air, 360 w/ C-6. Pretty fair shape, just some rust underneath. Paid 800.00 for it and guys said they had just had heads reworked, new rings and bearings but couldn't get valves adjusted.
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New User
Joined: Nov 2003
Posts: 15
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From: Lafayette,Ga
360 pushrod
Rusty70f100, I disassembled my rocker assembly and found a lot of wear on the rocker shafts. I'm going to replace both shafts and install new 9.680 pushrods. Checked lift on cam and its about 0,250" on all lobes. My question is how much force should be applied to (1) the pushrods to check if I have collapsed lifters and (2) when I'm installing pushrod assembly, when should the rocker arms come in contact with pushrods and app. how many turns on support bolts before the assembly is finally in place? When I disassembled rocker assembly once I broke the support bolts loose I could remove the bolts by hand. * I checked stroke on engine today and discovered I have a 390 instead of a 360. 390 stroke is app. 3.75" isn't it?
Post Fiend
Joined: Jan 2003
Posts: 8,600
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From: Iowa
Yep, 390 stroke is 3.784"
When checking lifters, push down the pushrod with about 10lbs of force. If it goes down it's bad. You dont need to hold it, they'll all eventually collapse if you hold 'em long enough. If you can feel the springeyness (sp?) in 'em they're bad.
Measure each pushrod. Ford sometimes used various length pushrods to compensate for the non-adjustable valvetrain. Get the same length and you should be fine. The hydraulic valve lifters take up any excess.
You torque the rocker shaft bolts to 45ft-lbs. One bolt on each side is necked down for oil passage up to the rocker shafts.
When checking lifters, push down the pushrod with about 10lbs of force. If it goes down it's bad. You dont need to hold it, they'll all eventually collapse if you hold 'em long enough. If you can feel the springeyness (sp?) in 'em they're bad.
Measure each pushrod. Ford sometimes used various length pushrods to compensate for the non-adjustable valvetrain. Get the same length and you should be fine. The hydraulic valve lifters take up any excess.
You torque the rocker shaft bolts to 45ft-lbs. One bolt on each side is necked down for oil passage up to the rocker shafts.
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