ready to down rockers,whats the correct procedure?
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On The Tree
Joined: May 2008
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ready to down rockers,whats the correct procedure? So I had 241 ls1 heads resurfaced,new headgaskets along with valve seals installed. Rockers are ready to go on and I need the procedure,i did a search but some say just torque it down,others say rotate the engine etc.
What's the correct procedure and should I use the old bolts or are these also 1 time use only?
What's the correct procedure and should I use the old bolts or are these also 1 time use only?
Here is the GM procedure. To find TDC on compression, rotate the motor and watch the cylinder #1 intake valve. When it opens then closes, it will be approximately 1/3 turn after it closes. You can use a straw to feel for the piston coming up to the top.
If using stock rockers, original bolts are OK. Just clean them up. If the heads were ported, make sure they didn't uncover the bolt hole on the intake side. If they did, you need to seal the intake bolts.
As you look at the driver head, the exhaust valve will line up with the exhaust port and the intake valve will line up with the intake port. From memory, driver's side should go from front to back: IEIEIEIE
As you look at the driver head, the exhaust valve will line up with the exhaust port and the intake valve will line up with the intake port. From memory, driver's side should go from front to back: IEIEIEIE
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Verdad Gallardo The problem with re-checking is that the 22 lb-ft is a running torque. Once you stop turning the bolt, you must overcome the static torque prior to the bolt rotating and getting a running torque value. They will therefore appear to be at 22 lb-ft of preload while they may actually be lower in reality.
12 Second Club
Joined: Sep 2005
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From: Bucks County, Pa.
12 Second Club
Joined: Sep 2005
Posts: 4,273
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From: Bucks County, Pa.
Thread Starter
On The Tree
Joined: May 2008
Posts: 156
Likes: 0
if 22 is a running torque that would mean that in order to recheck these one would have to back out the bolt and then go at it again to 22lbs, so youre just repeating the work with no gains.
Also is it recommended to pour some oil over the pushrods,rockers and springs before startup?
Also is it recommended to pour some oil over the pushrods,rockers and springs before startup?
Last edited by GLT1; Apr 8, 2016 at 03:35 PM.
I swapped valve springs last week to the BTR platinum from old Patriot Golds and decided to torque them to 22 ft. Lbs. When each cylinder had the 2 lifters on the base circle of the cam and the valve train seems much quieter than when I would just torque them to 22 regardless of where the lifters were on the cam lobe. Seems odd that it would be the springs themselves causing a major difference in sound and no other parts were changed so only thing left is how the rockers were torqued.
I'd use this method... regardless what anyone else says!
