LS3 upgrade help needed
Thread Starter
Registered User
Joined: May 2010
Posts: 2
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LS3 upgrade help needed Hey guys,
I know this topic has been beaten like a dead horse and I've found many answers I needed searching the threads but I can't seem to wrap my head around this one.
I followed ls1howto instructions on installing the cam in car with the heads on. Went great, dot to dot lined up perfect and I'm just about to switch out the springs/seats/seals/retainers and I've already installed a trunion upgrade to the stock rockers. According to ls1howto, I just throw everything at it, torque the rockers to 22ft/lbs, hand turn the engine, check'em again and then once reassembled, hand turn over a few times to check for any big mechanical issues (I'll also check piston to valve limits etc..)
is this ok or do I have to do something specific for each cylinder when installing the springs and rockers? (like moving each piston to TDC, valve heights)
I bought this as a specific replacement kit from a solid vendor so I didn't think I would need to check lifter preload, etc...for correct pushrod lengths and such. Plus how can you do lifter pre-load adjustments with upgraded stock rockers?(don't they just bolt down).
Thanks
I know this topic has been beaten like a dead horse and I've found many answers I needed searching the threads but I can't seem to wrap my head around this one.
I followed ls1howto instructions on installing the cam in car with the heads on. Went great, dot to dot lined up perfect and I'm just about to switch out the springs/seats/seals/retainers and I've already installed a trunion upgrade to the stock rockers. According to ls1howto, I just throw everything at it, torque the rockers to 22ft/lbs, hand turn the engine, check'em again and then once reassembled, hand turn over a few times to check for any big mechanical issues (I'll also check piston to valve limits etc..)
is this ok or do I have to do something specific for each cylinder when installing the springs and rockers? (like moving each piston to TDC, valve heights)
I bought this as a specific replacement kit from a solid vendor so I didn't think I would need to check lifter preload, etc...for correct pushrod lengths and such. Plus how can you do lifter pre-load adjustments with upgraded stock rockers?(don't they just bolt down).
Thanks
Last edited by Gxp0803; May 25, 2010 at 09:49 PM. Reason: Spelling
Your pushrods will have to be the correct length. With non adjustable rockers the only thing you can adjust is the pushrod length. If you do not put the pistons at tdc or use air in the cylinders your valves will drop into the cylinder when you remove the springs. Maybe you will get lucky...does not usually happen with engine work.
Thread Starter
Registered User
Joined: May 2010
Posts: 2
Likes: 0
Your pushrods will have to be the correct length. With non adjustable rockers the only thing you can adjust is the pushrod length. If you do not put the pistons at tdc or use air in the cylinders your valves will drop into the cylinder when you remove the springs. Maybe you will get lucky...does not usually happen with engine work.
Do the pistons need to be in a certain position when installing these or can I just put the pushrods/rockers in and as long as it torques to 22ft/lbs after 1-1.5 turns past hand tight will I be good to go?
