hydraulic lifter ajustment ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1968GMC · 04-13-2002, 08:09 PM

2 questions
1)- When you adjust hydraulic lifters you have to ajust them on the low (valve cloesed)part of the cam rite?
2)- After ajusting them and rotating the cam to the high spot( valve open) I cannot spin the push rod, but on the low spot(valve closed, I can. Is this normal?
I adjusted them by spinning the pushrod until no more slack then turn the bolt 1/2 turn to compress the plunger,doing this on the low spot of cam.
I just want to make sure I'm doing it rite tanx.

Longhorn Man · 04-13-2002, 08:14 PM

You got it, sounds good.
The book will call for one full turn after zero lash, but what you have done (refered to as 1/2 past zero) is an old hot rodders truck that frees up the engine just a little. Makes it rev a hair quicker.
Once you fire it and brake in the cam, if you have any lifter tick, remove the covers and find the one that is ticking. While it is running, turn till the tick goes away, then 1/2 more turn.
Some will say this is a no-no doing it 1/2 past, but it has always worked for my grand father (old school hot rodder) and I've never had a problem either.

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio

69 longhorn · 04-13-2002, 08:16 PM

Yup,I 2nd that.....1 full turn is too tight for a perf eng......69

1968GMC · 04-13-2002, 08:31 PM

I instaled a edelbrock cam and they tell me to go 1/2 turn after zero lash. In my hayns book, they tell me to go 1 turn but i went with what edelbrock said.

Longhorn Man · 04-13-2002, 08:41 PM

Esp with eldebrock cams...they seem to wear a little too fast. (heard way too many ppl that this has happened to) I'm running one with about 50K on it...so far so good.
Kinda contradicting myself huh?

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio

69 longhorn · 04-13-2002, 08:53 PM

Comp cams says 1/2 turn also. I have run them as loose as 1/8 turn,& spun stock springs to 6800 rpms.....its in how to hotrod the smallblack chev book....69

04-13-2002, 08:09 PM	#1
1968GMC love my truck Join Date: May 2001 Location: aylmer QC Posts: 648	hydraulic lifter ajustment ? 2 questions 1)- When you adjust hydraulic lifters you have to ajust them on the low (valve cloesed)part of the cam rite? 2)- After ajusting them and rotating the cam to the high spot( valve open) I cannot spin the push rod, but on the low spot(valve closed, I can. Is this normal? I adjusted them by spinning the pushrod until no more slack then turn the bolt 1/2 turn to compress the plunger,doing this on the low spot of cam. I just want to make sure I'm doing it rite tanx.

04-13-2002, 08:16 PM	#3
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Yup,I 2nd that.....1 full turn is too tight for a perf eng......69 __________________ http://community.webshots.com/user/hotrodhorn

04-13-2002, 08:53 PM	#6
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Comp cams says 1/2 turn also. I have run them as loose as 1/8 turn,& spun stock springs to 6800 rpms.....its in how to hotrod the smallblack chev book....69 __________________ http://community.webshots.com/user/hotrodhorn

04-13-2002, 08:14 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	You got it, sounds good. The book will call for one full turn after zero lash, but what you have done (refered to as 1/2 past zero) is an old hot rodders truck that frees up the engine just a little. Makes it rev a hair quicker. Once you fire it and brake in the cam, if you have any lifter tick, remove the covers and find the one that is ticking. While it is running, turn till the tick goes away, then 1/2 more turn. Some will say this is a no-no doing it 1/2 past, but it has always worked for my grand father (old school hot rodder) and I've never had a problem either. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. If you need a pic posted, E-mail me at longhornmail@yahoo.com Andy, in Columbus Ohio

04-13-2002, 08:31 PM	#4
1968GMC love my truck Join Date: May 2001 Location: aylmer QC Posts: 648	I instaled a edelbrock cam and they tell me to go 1/2 turn after zero lash. In my hayns book, they tell me to go 1 turn but i went with what edelbrock said.

04-13-2002, 08:41 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Esp with eldebrock cams...they seem to wear a little too fast. (heard way too many ppl that this has happened to) I'm running one with about 50K on it...so far so good. Kinda contradicting myself huh? ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. If you need a pic posted, E-mail me at longhornmail@yahoo.com Andy, in Columbus Ohio



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