350 chevy, rockers, valve lash and a idiot (me!) :-( - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-13-2006, 03:06 PM
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350 chevy, rockers, valve lash and a idiot (me!) :-(

Help, im in the process of rebuilding a 350 small block chevy.
My problem is i bought new followers / lifters and soaked them for 72 hours, i put them into the block, put the pushrods in and then set about putting the rockers on.
Ok so far?
However, when it came to adjusting the rockers for lash, i cant, the pushrods just wont meet the rockers,i can wind the nut right down and it just doesn't meet. The rocker studs have been machined and replaced with ARP 170k 3/8" arm studs ( part no 134-7101 ), this may seem daft but are these longer studs than the originals? Do the lifters need to be pumped up more? or am i just plain dim? Any help would be so appreciated i just want to get my car back on the road!

cheers and i hope someone can shed some light on this

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Old 05-13-2006, 04:13 PM
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what i do to prime lifters outside the motor is put them in a gallon jug of tranni fluid and let them ride around in my truck for a while that may be a stupid way to do it but it works for me and the way id check to see if their pummped up is try to press them down with a pushrod
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Old 05-13-2006, 05:08 PM
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If the pushrods won`t meet the rocker arms with them tightened all the way down you don`t have a lifter problem. The distance a hydraulic lifter pumps up isn`t very much. It could be the push rods are too short, the new studs are incorrect lenth, or the studs are on guide plates that make them sit too high to make contact.
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Old 05-13-2006, 08:04 PM
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valve lash

Did you change heads after market maybe?Your problem is your push rod length you may need .100 or .150 longer rods I did with my new AFR's.
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Old 05-13-2006, 08:39 PM
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Sounds like maybe you removed the old press in studs and tapped the holes? If that is the case the rocker stud boss has to be milled down quite a bit to make the nut part of the stud is lower. If I remember correctley the nut is 5/16 tall and the guide plate is 1/8 so you have to mill 7/16 off the boss and lower the stud and plate back to the original height.
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Old 05-14-2006, 03:35 AM
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Thanks for so many answers!

The heads are cast iron and original i think, the only difference being that the original builder had the old studs taken out and the bores tapped for the Arp rocker studs.

Im guessing that from the last post, that the heads needed the stud top machined to compensate, i can tell you that they haven't.

I must admit i didn't think it was the lifters.
Can i buy longer pushrods? and if so any guesses on what length?
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Old 05-16-2006, 09:00 PM
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rod length

Get your self a push rod checker.You will probably need at least .500 best fix is to machine the heads the thickness of guide plate and hex on stud.Good luck.
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Old 05-17-2006, 05:25 AM
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Thnx, i spoke to an engine builder here and hes said i need to have the rocker stud bases machined.

THnx to all, i did a stupid ting at the weekend and electrocuted myself so im down to one arm at the moment so the car gets pushed back once more.

But at least i know in what direction im heading! thnx
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Old 05-17-2006, 10:14 AM
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You still got a good arm right? GET TO WORK!
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Old 05-17-2006, 01:24 PM
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This is true! Dont worry i purchased some more tools today so.............. just dont tell the wife!
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Old 06-03-2006, 02:20 AM
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Just in case anyones wondered and if it might help others.
Ive had the base of the Rocker Studs machined down by 10.5 mm , now the ARP 170k rocker studs fit perfectly, so theyre you go!

Thanks to everyone that wrote a reply on here, its great to know that youre not alone!!!!
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