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Author Topic: need help asap  (Read 3458 times)

Offline olblue2

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need help asap
« on: August 08, 2009, 09:32:44 pm »
ok guys, need help with my 1977 k-20 4x4.  just got it and it has a newly rebuilt 350. now what is the absolute easiest way to set the valves??  ive seen so many ideas and i need the easiest way. id prefer the non running method, so any help will be GREATLY appreciated.  please describe in easy terms to understand

thanks guys
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Offline VileZambonie

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Re: need help asap
« Reply #1 on: August 09, 2009, 10:53:16 am »
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Offline olblue2

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Re: need help asap
« Reply #2 on: August 09, 2009, 06:22:25 pm »
what is zero clearance? some say up and down play, others say turning the pushrod.  when turning the pushrod should u tighten down till u cant turn the pushrod or barely turn it??   im very confused.  and dont want to screw somethin up.   


also this is a weird question, i noticed today that the motor thats in the truck thats been rebuilt has on one head were the pushrods go thru the head, the holes on one head are rounded on top and bottom and have straight sides and are very close to the sides of the pushrod,   the other head had round holes were the pushrod goes thru.  guy i know saw it and said it may have been a hol or 2 got tore up and they machined them round, but now theres so much room around the pushrod that its making the rockers move side to side on the valves.   he said i needed self aligning rockers??  are they all the same for small chevy?        help me pleaseeeeeeeee
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Offline VileZambonie

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Re: need help asap
« Reply #3 on: August 09, 2009, 07:46:56 pm »
What are the casting #s on the heads? What rockers do you have? Tighten the rocker on the base circle of the cam til zero lash is felt moving the pushrod up and down. You can still spin the push rod with the lifter depressed. Tighten up to 1 full turn additional.
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,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline olblue2

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Re: need help asap
« Reply #4 on: August 09, 2009, 08:03:57 pm »
stock stamped rockers,  casting numbers says when looked up its a gm crate replacement head.  i think the last three digits on head was 389, or 369.   


my autozone has stock stamped self aligning rockers for small chevy, says for newer model truck but looks exactly same as stock stampers i have, says same ratio 1.5 shoul dbe ok im assuming. 

its a freshly built 350, hydraulic lifters, mild cam. 

was i was told to adjust is to turn engine over and watch #1 exhaust valve, once it starts to go down(open ) then adjust the intake,  the turn over till intake goes down (open) the adjust exhaust,  then on down the line same for all,     is this correct??

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Offline low budget

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Re: need help asap
« Reply #5 on: August 10, 2009, 10:13:03 pm »
Watch this, see if this helps...


http://www.youtube.com/watch?v=89o5rLpbCgI
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86 Chevy LWB 305 scrapped for 350, 3/5 drop

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Re: need help asap
« Reply #6 on: August 11, 2009, 12:06:30 pm »
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