? about rr

302crew · 10-02-2002, 07:42 PM

well ive been using my roller rockers for awhile now and never really shimmed them or did anything just torqued them and that was it i recently blew my motor and had my heads milled .25thousands of an inch do i have to shim them or anything the car runs now but i dont know if im getting the max compression or if there working right i figured i should havbe to put shims in there since its been milled down 25 thousands of an inch any help or sugestions would be apriaciated

302crew · 10-03-2002, 12:40 AM

hello anyone

Superpromustang · 10-03-2002, 10:20 AM

are you using pedestal mount rocker type heads?

Superpromustang · 10-03-2002, 05:18 PM

If you're using pedestal type rockers then you need to get a .025 shorter pushrod so you will be sure you have max compression

302crew · 10-03-2002, 05:30 PM

I HAVE CRANE 1.7 BOLT DOWN so o would HAVE TO ADD A SHIM would not having the shims in caused my car to run crapy

fiveohpatrol · 10-03-2002, 05:40 PM

If you dont have the shim and just torqued your rockers down, they would be putting too much pressure on the valve, and its possible that they aren't letting the valve fully close, resulting in crappy performance.

Put a 0.025" shim under the rocker, and tighten the bolt down until you can no longer spin the pushrod freely, then if the shim is correct, you will come to your torque spec between 1/4-3/4 of a turn.

good luck

87gt17815 · 10-03-2002, 07:51 PM

If you follow the proper way to install the rockers you will have no problems. But if the heads were milled and the rockers are non adjustable then a shorter pushrod is in your future. All you have to do is tighten the rocker until zero lash (no slop) then proceed to torgue the rocker to the spec probobly 15 ft. lbs. or so. It should get tight within 1/4 to 1 turn. It it takes more then a shim is needed. Start with a thin shim which roughly gives you back a quarter turn and if that is not enough a thick shim will give you back a 1/2 to 3/4 turn. Shim the rocker until it tightens within a 1/4 to 1 turn

muskrat · 10-03-2002, 08:17 PM

The correct spec is 24ft lb.

Superpromustang · 10-04-2002, 09:28 AM

yes the correct torque spec for pedestal mount rockers is 24 ft/lb, there is no lash or adjusment on these

10-02-2002, 07:42 PM	#1
302crew Registered Member Join Date: May 1999 Location: sloatsburg Posts: 261	? about rr well ive been using my roller rockers for awhile now and never really shimmed them or did anything just torqued them and that was it i recently blew my motor and had my heads milled .25thousands of an inch do i have to shim them or anything the car runs now but i dont know if im getting the max compression or if there working right i figured i should havbe to put shims in there since its been milled down 25 thousands of an inch any help or sugestions would be apriaciated __________________ 306 edelbrock 6037 heads full mac exuast 1.7 rr 373 rear hd clutch tremec mighty demon 650 carb msd ignition rpm air gap intake custom cam still trying to get it to run right

10-03-2002, 12:40 AM	#2
302crew Registered Member Join Date: May 1999 Location: sloatsburg Posts: 261	hello anyone __________________ 306 edelbrock 6037 heads full mac exuast 1.7 rr 373 rear hd clutch tremec mighty demon 650 carb msd ignition rpm air gap intake custom cam still trying to get it to run right

10-03-2002, 05:30 PM	#5
302crew Registered Member Join Date: May 1999 Location: sloatsburg Posts: 261	I HAVE CRANE 1.7 BOLT DOWN so o would HAVE TO ADD A SHIM would not having the shims in caused my car to run crapy __________________ 306 edelbrock 6037 heads full mac exuast 1.7 rr 373 rear hd clutch tremec mighty demon 650 carb msd ignition rpm air gap intake custom cam still trying to get it to run right Last edited by 302crew; 10-03-2002 at 05:37 PM..

10-03-2002, 05:40 PM	#6
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	If you dont have the shim and just torqued your rockers down, they would be putting too much pressure on the valve, and its possible that they aren't letting the valve fully close, resulting in crappy performance. Put a 0.025" shim under the rocker, and tighten the bolt down until you can no longer spin the pushrod freely, then if the shim is correct, you will come to your torque spec between 1/4-3/4 of a turn. good luck __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

10-03-2002, 10:20 AM	#3
Superpromustang Registered Member Join Date: Oct 2002 Location: Carthage, MO Posts: 59	are you using pedestal mount rocker type heads?

10-03-2002, 05:18 PM	#4
Superpromustang Registered Member Join Date: Oct 2002 Location: Carthage, MO Posts: 59	If you're using pedestal type rockers then you need to get a .025 shorter pushrod so you will be sure you have max compression

10-03-2002, 07:51 PM	#7
87gt17815 Registered Member Join Date: Aug 2002 Location: Bloomsburg,PA Posts: 34	If you follow the proper way to install the rockers you will have no problems. But if the heads were milled and the rockers are non adjustable then a shorter pushrod is in your future. All you have to do is tighten the rocker until zero lash (no slop) then proceed to torgue the rocker to the spec probobly 15 ft. lbs. or so. It should get tight within 1/4 to 1 turn. It it takes more then a shim is needed. Start with a thin shim which roughly gives you back a quarter turn and if that is not enough a thick shim will give you back a 1/2 to 3/4 turn. Shim the rocker until it tightens within a 1/4 to 1 turn

10-03-2002, 08:17 PM	#8
muskrat Registered Member Join Date: Mar 1999 Location: va Posts: 35	The correct spec is 24ft lb.

10-04-2002, 09:28 AM	#9
Superpromustang Registered Member Join Date: Oct 2002 Location: Carthage, MO Posts: 59	yes the correct torque spec for pedestal mount rockers is 24 ft/lb, there is no lash or adjusment on these