rocker adjustment

pearlgt40 306 · 07-12-2005, 09:24 PM

putting new valve covers on and I want to adjust the valvetrain. stock pedestal mount setup with frpp 1.6's. took them off and inspected all associated parts and all is well. now, to retighten them. can i simply tighten them all down equally without turning the motor over. i figure that the rocker trunnion seats on the pedestal no matter what you do so if you make them all equally tight it should be good. lifter preload cannot be adjusted and therefore it is simply a tightening of the pivot point. please lend your knowledge.

Hozer 88GTConv · 07-13-2005, 12:52 PM

To properly install the roller rockers, rotate the engine until the lifter is on the heel of the cam. While you're tightening the rocker, rotate the pushrod with your fingers. When you can't rotate it any further, the rocker is at zero lash. Then tighten the adjusting nut one-quarter to three-quarters turn. If you must turn the adjusting nut more than that, you must use shims to properly adjust the rockers.

pearlgt40 306 · 07-13-2005, 06:23 PM

im aware of that method. (top dead center method) and also eoic, when exhaust opens adjust the intake and when the intake is closing adjust the exhaust. Used when radical cams are used to ensure heel of cam lobe. Thats all well and good. but with stock pedestal mount valvetrain it seems as though as much as you tighten the rocker it cannot preload the lifter any further since it is sitting on its pedestal. How could it move down further. Or on the other hand, tightening till the pushrod stops moving could leave the rocker raised, not on the pedestal......Would this be ok. I dont think it would be. Your advice works perfectly on stud mount rockers.

USMC302 · 07-14-2005, 06:53 AM

lol, yeah on stock just tighten them all down 20ft/lbs.

Hozer 88GTConv · 07-14-2005, 04:30 PM

sorry about the misread, my ADD must be acting up again...time for a beer

07-14-2005, 05:09 PM

I still had to use shims when upgrading to 1.72 pedestal mount rockers, back when I had my stock motor & heads. I don't remember the exact tightening method I used (sorry, it's been many years)...but I know that shims were involved.

07-12-2005, 09:24 PM	#1
pearlgt40 306 Registered Member Join Date: May 2002 Location: Long Island, NY Posts: 14	rocker adjustment putting new valve covers on and I want to adjust the valvetrain. stock pedestal mount setup with frpp 1.6's. took them off and inspected all associated parts and all is well. now, to retighten them. can i simply tighten them all down equally without turning the motor over. i figure that the rocker trunnion seats on the pedestal no matter what you do so if you make them all equally tight it should be good. lifter preload cannot be adjusted and therefore it is simply a tightening of the pivot point. please lend your knowledge. __________________ 306 Short Block, Forged Pistons, GT-40 Irons, Ford Racing 1.6 Ratio Rockers, GT-40 Upper and Lower Intake, B-303 Cam, 24 lb Injectors, 70 MM Throttle Body, 75 mm MAF, MAC Cold Air Intake(in fender), March Ram Air Scoop, MAC Longtubes, Offroad H-Pipe 2.5", No Cats, 40 Series Flows, 2.73's(eek...), Kenny Brown Subframes, World Class T-5, Pro 5-0 Tower Shifter

07-13-2005, 12:52 PM	#2
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: rocker adjustment To properly install the roller rockers, rotate the engine until the lifter is on the heel of the cam. While you're tightening the rocker, rotate the pushrod with your fingers. When you can't rotate it any further, the rocker is at zero lash. Then tighten the adjusting nut one-quarter to three-quarters turn. If you must turn the adjusting nut more than that, you must use shims to properly adjust the rockers. __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

07-13-2005, 06:23 PM	#3
pearlgt40 306 Registered Member Join Date: May 2002 Location: Long Island, NY Posts: 14	Re: rocker adjustment im aware of that method. (top dead center method) and also eoic, when exhaust opens adjust the intake and when the intake is closing adjust the exhaust. Used when radical cams are used to ensure heel of cam lobe. Thats all well and good. but with stock pedestal mount valvetrain it seems as though as much as you tighten the rocker it cannot preload the lifter any further since it is sitting on its pedestal. How could it move down further. Or on the other hand, tightening till the pushrod stops moving could leave the rocker raised, not on the pedestal......Would this be ok. I dont think it would be. Your advice works perfectly on stud mount rockers. __________________ 306 Short Block, Forged Pistons, GT-40 Irons, Ford Racing 1.6 Ratio Rockers, GT-40 Upper and Lower Intake, B-303 Cam, 24 lb Injectors, 70 MM Throttle Body, 75 mm MAF, MAC Cold Air Intake(in fender), March Ram Air Scoop, MAC Longtubes, Offroad H-Pipe 2.5", No Cats, 40 Series Flows, 2.73's(eek...), Kenny Brown Subframes, World Class T-5, Pro 5-0 Tower Shifter

07-14-2005, 06:53 AM	#4
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: rocker adjustment lol, yeah on stock just tighten them all down 20ft/lbs. __________________

07-14-2005, 04:30 PM	#5
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: rocker adjustment sorry about the misread, my ADD must be acting up again...time for a beer __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

07-14-2005, 05:09 PM	#6
Simi Stang Guest Posts: n/a	Re: rocker adjustment I still had to use shims when upgrading to 1.72 pedestal mount rockers, back when I had my stock motor & heads. I don't remember the exact tightening method I used (sorry, it's been many years)...but I know that shims were involved.

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