0 lash????

289 · 12-13-2003, 09:38 AM

Hi
I am really hoping some one can tell me exactly what does 0 lash mean on a roller rocker
I'm putting SVO 1.72 roller rockers, stud mount(with the hex head bolt)on and I need some advice how much to torque them down.
Thanks

fiveohpatrol · 12-13-2003, 07:36 PM

0 lash is the point where there is no gap between the rocker/pushrod/lifter arrangement.
There are a couple different opinions on "where" exactly it is. Some say that you tighten down the rocker while spinning the corresponding pushrod between 2 fingers, and feel for when it just starts to get some resistance. Others say to move the pushrod up and down while tightening until there is no more movement.
Me, I kinda do a little bit of both, and it always works for me.

good luck

-Drew

billheis · 12-13-2003, 11:16 PM

What fiveoh said, then youll want to tighten them another 1/4 to 1 turn more. There are varying opinions on that but try 1/2 turn moe and that should be close

Jeff Chambers · 12-14-2003, 08:52 AM

Your original post is sort of confusing. Do you have stud mount or pedestal mount? I don't understand what you mean by "head head on".

If they are pedestal mount, you need to torque to about 18 ft-lbs, but you have to reach that torque in 1/4 to 1 turn after zero lash. If you can't reach the torque in that given range, then you'll either need to add or remove shimming beneath the pedestal.

If you've got pedestal mount, then the torque to preload is irrelevant. You'll turn the poly-lock 1/4 to 1 turn past zero lash then lock down the poly-lock as tight as you can get it.

QuantumMotorsports · 12-14-2003, 12:31 PM

I'm sure you meant stud mount the second time right Jeff? Hehehe, must have been another early morning post.

Jeff Chambers · 12-14-2003, 04:50 PM

Yep stud mount there.

12-13-2003, 09:38 AM	#1
289 Registered Member Join Date: Jan 2000 Location: Mount Joy, PA , U.S. Posts: 198	0 lash???? Hi I am really hoping some one can tell me exactly what does 0 lash mean on a roller rocker I'm putting SVO 1.72 roller rockers, stud mount(with the hex head bolt)on and I need some advice how much to torque them down. Thanks

12-13-2003, 07:36 PM	#2
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	0 lash is the point where there is no gap between the rocker/pushrod/lifter arrangement. There are a couple different opinions on "where" exactly it is. Some say that you tighten down the rocker while spinning the corresponding pushrod between 2 fingers, and feel for when it just starts to get some resistance. Others say to move the pushrod up and down while tightening until there is no more movement. Me, I kinda do a little bit of both, and it always works for me. good luck -Drew __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

12-13-2003, 11:16 PM	#3
billheis Registered Member Join Date: May 2001 Location: Fernandina Beach, FL 32034 Posts: 178	What fiveoh said, then youll want to tighten them another 1/4 to 1 turn more. There are varying opinions on that but try 1/2 turn moe and that should be close __________________ Bill Heiser 90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter

12-14-2003, 08:52 AM	#4
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Your original post is sort of confusing. Do you have stud mount or pedestal mount? I don't understand what you mean by "head head on". If they are pedestal mount, you need to torque to about 18 ft-lbs, but you have to reach that torque in 1/4 to 1 turn after zero lash. If you can't reach the torque in that given range, then you'll either need to add or remove shimming beneath the pedestal. If you've got pedestal mount, then the torque to preload is irrelevant. You'll turn the poly-lock 1/4 to 1 turn past zero lash then lock down the poly-lock as tight as you can get it. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

12-14-2003, 12:31 PM	#5
QuantumMotorsports Registered Member Join Date: Jul 2000 Location: Norman, Oklahoma, USA Posts: 597	I'm sure you meant stud mount the second time right Jeff? Hehehe, must have been another early morning post. __________________ Michael Black QuantumMotorsports Norman, OK 1984 LX Hatch 306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat. Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites

12-14-2003, 04:50 PM	#6
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Yep stud mount there. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

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