HELP: Pushrod Length & rocker Arms
05-24-2018, 03:16 AM
#21
Launching!
I am running a BTR Truck Stage 2 Cam (212/218 .553/.553 113+2 LSA), TSP-PRC 243 heads that have been milled to 63cc (Around 0.010" Milled, I Think), Cometic 3.910" Bore - 0.045" Compressed Thickness Head Gaskets, Stock Rocker Arms with CHE Trunnions, LS7 Lifters, and I ended up using 7.375" Pushrods.
I used the Comp 7702-1 Pushrod Length Checker. I ended up with 10 turns, which is 7.300" and added 0.075" Preload. Basically back to stock pushrods, which are 7.380" in the Gen4 LMG 5.3. I used Tick Performance .105" Wall Pushrods as well.
I used the Comp 7702-1 Pushrod Length Checker. I ended up with 10 turns, which is 7.300" and added 0.075" Preload. Basically back to stock pushrods, which are 7.380" in the Gen4 LMG 5.3. I used Tick Performance .105" Wall Pushrods as well.
Last edited by 07NBSChevy; 05-24-2018 at 03:28 AM.
05-24-2018, 03:23 AM
#22
Launching!
Each turn is equal to 0.050"
0.050" x 11 = .55
.55 + 6.800" = 7.350"
7.350" + Desired Preload on Lifters = 7.xxx
So you should be using a 7.400" or 7.425" Pushrod. If using LS7 Lifters, 0.075" preload would be about ideal, which would be 7.425" Pushrods.
Last edited by 07NBSChevy; 05-24-2018 at 03:29 AM.
05-24-2018, 06:24 AM
#23
I will double check again it could have been 12 turns, I believe I set it to 11 got lash, went to 12 got no lash, went to 13 and the rocker wouldn’t seat. I’m going to have to check every cylinder again this weekend. Really not trying to play trial and error with push rods haha
05-25-2018, 02:13 AM
#24
Launching!
When you get zero lash, is your rocker arm bolt tight?
Some people do it differently than I do, but I will actually torque the rocker bolt to spec, 22 lb-ft or whatever it is, then adjust for zero lash. Some people just tighten the rocker arm bolt to snug, no idea if it actually makes a difference.
Some people do it differently than I do, but I will actually torque the rocker bolt to spec, 22 lb-ft or whatever it is, then adjust for zero lash. Some people just tighten the rocker arm bolt to snug, no idea if it actually makes a difference.
05-25-2018, 11:13 AM
#26
05-25-2018, 12:35 PM
#27
aha I worded it wrong, said to be discreet in a 6.0 but aggressive in a 4.8. But supposed to bring power in fast and quick, which is really all I can ask for out of the 4.8.
06-02-2018, 11:16 AM
#30
Launching!
regardless they recommended it haha, I was initially looking at 224r but that was definitely to big. The 220 will be just fine for a little street truck, should bring the power in pretty quick and keep a relatively consistent power curve, and yeah definitely a lot of overlap in a 5.3 but from what I have been told by them is it is a pretty mild cam for a 6.0. But I have no idea, I know how to put them in haven't figured out how determine what will work best yet 