LS6 Cam, what's needed
10-04-2011, 09:52 PM
#44
I have ls6 lifters on a 241 head.. My understanding is that ls7 lifters are taller and you would need a shorter pushrod length than ls1/ls6 lifters.
Let me know how that setup runs. I'm still on the fence with heads.. Not sure it's worth it yet.
Let me know how that setup runs. I'm still on the fence with heads.. Not sure it's worth it yet.
10-05-2011, 12:09 AM
#45
I had it on the highway tonight and i like it, no valve chatter. From what i've read the lifters LS7 are the GM replacement for all LS1 and LS6 engines. My guy told me to get the 7.4 but when he measured them they were too long. Now i have a set to put on ebay.
10-05-2011, 08:18 AM
#48
Good to hear it's running good but for most applications those are not the correct push rods. If you have stock heads with ls1 lifter 7.425 push rods are needed because the base circle on the cam is smaller than the ls1 cam... If you have real z06 heads, the valves are longer which allows you to use the same 7.4 push rods the car comes with stock.. In your case its special you used the "replacement" ls7 lifters which ideally need a .050 shorter pushrod and since you have 799 heads means they probably arent real ls6 heads with the hollow valves you cant take advantage of the longer valves. so actually the 7.375 pushrod makes sense in your case but not for most people
10-05-2011, 08:57 AM
#49
I didn't think that the hollow valve stem valves came in ALL 243 heads, and from what I've read the 243 and the 799 are the same except for where they are manufactured. My heads are New and the valves are New Take Offs from an LS2 which makes them the correct valve for the head, I checked the part number. Also I said 04 Z06 cam.
10-07-2011, 08:01 AM
#50
I didnt say all 243 heads had the valves only the ones that came on the ls6 I didn't say that the 799 wasn't the same head but was never put on an ls6 atleast I have never seen them. all I'm saying is that please don't tell people that a 7.375 pr will work for them because people using your exact setup with the stock ls1 lifters WILL take 7.425 because the ls1 lifter are shorter and the standard valves are shorter. My motor has the stock 7.4s in it because I have factory ls6 243s with the hollow valves and an 02 z06 cam.... Btw 04 z06 really doesn't matter the ls6 cam is the same from 02-06 01 is the only differen year so I'm not sure what you meant there
10-09-2011, 01:10 PM
#55
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Great thread and info here. I'm doing a set of actual Z-06 243 Heads and the 02+ LS6 cam myself. Been there done that with the big cam big heads race car thing before as well, just looking for stock characteristics at this point. One thing I'm confused on is the lifters. I remember I bought some LS7 replacements years back when I did my stroker and they were identical to stock and I was able to use the same 7.4 chromoly pushrods I had from doing a cam only setup prior. Has there been any design change in the LS7 replacement lifters in recent years?
10-09-2011, 03:41 PM
#56
Great thread and info here. I'm doing a set of actual Z-06 243 Heads and the 02+ LS6 cam myself. Been there done that with the big cam big heads race car thing before as well, just looking for stock characteristics at this point. One thing I'm confused on is the lifters. I remember I bought some LS7 replacements years back when I did my stroker and they were identical to stock and I was able to use the same 7.4 chromoly pushrods I had from doing a cam only setup prior. Has there been any design change in the LS7 replacement lifters in recent years?
