Some lifter, stud, cam and assembly questions.
Some lifter, stud, cam and assembly questions. OK guys, I am ready to start putting together my LS2 402. I ordered new lifters and was hoping to get a couple of things clarified.
1) Should lifters be soaked in oil?
2) What is lifter preload?
3) Using ARP studs. Do I use the stock torque/angle specs or different ones? If different, does someone know what they should be?
4) Do you really have to degree the cam in or can it just be put in on the "dot"?
Any other advise would help.
Thanks in advance.
1) Should lifters be soaked in oil?
2) What is lifter preload?
3) Using ARP studs. Do I use the stock torque/angle specs or different ones? If different, does someone know what they should be?
4) Do you really have to degree the cam in or can it just be put in on the "dot"?
Any other advise would help.
Thanks in advance.
Originally Posted by 98Z28CobraKiller
OK guys, I am ready to start putting together my LS2 402. I ordered new lifters and was hoping to get a couple of things clarified.
1) Should lifters be soaked in oil?
2) What is lifter preload?
3) Using ARP studs. Do I use the stock torque/angle specs or different ones? If different, does someone know what they should be?
4) Do you really have to degree the cam in or can it just be put in on the "dot"?
Any other advise would help.
Thanks in advance.
1) Should lifters be soaked in oil?
2) What is lifter preload?
3) Using ARP studs. Do I use the stock torque/angle specs or different ones? If different, does someone know what they should be?
4) Do you really have to degree the cam in or can it just be put in on the "dot"?
Any other advise would help.
Thanks in advance.
1) You can if you want, but I would just run some assembly lube over the rollers on the end and maybe put a little bit in the cup where the pr sits.
2) Lifter preload refers to how tight the pushrod is against the lifter when the rockers are torqued to spec. Too much slack, or the opposite, will affect valvetrain noise. Proper preload is about 1.5 turns past finger tight on the rocker bolts. In order to figure out your preload, put the lifters/pr's/rockers on and tighten the rocker bolt down until the rocker just barely has no lateral play. Then, you want to count how many turns it takes you to reach 22 ft/lbs of tq on the rocker bolts. 1.5 or so is about optimal.
3) Using ARP studs you do not use the factory specs. ARP has the exact torque sequence/specs on their website. It's something around ~75-80 ft/lb when all is said and done.
4) You don't have to degree a cam. You can, and most people do, just install it dot to dot (especially when it's an off the shelf cam and is spec'd usually with a few degrees of advance ground in - TR224 for example).
