Ls1 vs LS6 pushrod lengths?
02-12-2006, 12:27 PM
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Ls1 vs LS6 pushrod lengths? What is the stock LS1 pushrod length? And what is the LS6 length?
Can I sell my '02 LS6 cam, springs, and pushrods to someone looking to install them in their LS1 using LS1 heads or are the pushrods the incorrect length?
Thanks,
Kris
Can I sell my '02 LS6 cam, springs, and pushrods to someone looking to install them in their LS1 using LS1 heads or are the pushrods the incorrect length?
Thanks,
Kris
02-12-2006, 12:35 PM
#2
Lengths Heres what you need to know
Originally Posted by PREDATOR-Z
If you are doing:
LS6 heads/valves + LS6 cam > stock or 7.40 aftermarket
LS6 heads/valves + Ls1 cam > 7.375 aftermarket
LS1 heads/valves + LS6 cam > 7.425 aftermarket
If you are doing:
LS6 heads/valves + LS6 cam > stock or 7.40 aftermarket
LS6 heads/valves + Ls1 cam > 7.375 aftermarket
LS1 heads/valves + LS6 cam > 7.425 aftermarket
02-12-2006, 12:35 PM
#3
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They will work but the preload on the lifters will be looser than stock.
LS6 valves are .0236 inch taller to compensate for the smaller base circle of the LS6 cam.
So .0236/1.7= .014 smaller radius. (extra length p-rod needed)
Some aftermarket 7.40 will work (he can ask the shop to actually measure one for him), some actually measure 7.41 (I think Thunder ones, if I remember correctly).
(The post above can be used too, the 7.425 will increase preload a tad more than stock but well within stock lifter margin), make the setup less noisy.
Now, while it is better to stay on the shorter side with big cams, the LS6 lifts and ramps do not affect the lifter adversely by a little more preload.
LS6 valves are .0236 inch taller to compensate for the smaller base circle of the LS6 cam.
So .0236/1.7= .014 smaller radius. (extra length p-rod needed)
Some aftermarket 7.40 will work (he can ask the shop to actually measure one for him), some actually measure 7.41 (I think Thunder ones, if I remember correctly).
(The post above can be used too, the 7.425 will increase preload a tad more than stock but well within stock lifter margin), make the setup less noisy.
Now, while it is better to stay on the shorter side with big cams, the LS6 lifts and ramps do not affect the lifter adversely by a little more preload.
Last edited by PREDATOR-Z; 02-12-2006 at 12:42 PM.
05-19-2006, 07:36 PM
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Thanks for the very good info PREDATOR-Z! sorry to drag up such an old post but it's very relevant to my problem. I have stock LS6 heads and gaskets and I want to put a TSP 224/224, .566"/.566" 114LSA tsp cam. I talked to Zack at TSP and he says the 7.4" manley hardened pushrods I already have are ok to use. Sounds like the 7.375"s are a better bet according to this thread 
. My question is what kind of problem if any will I run into using the 7.4"s?
. My question is what kind of problem if any will I run into using the 7.4"s?
Originally Posted by PREDATOR-Z
They will work but the preload on the lifters will be looser than stock.
LS6 valves are .0236 inch taller to compensate for the smaller base circle of the LS6 cam.
So .0236/1.7= .014 smaller radius. (extra length p-rod needed)
Some aftermarket 7.40 will work (he can ask the shop to actually measure one for him), some actually measure 7.41 (I think Thunder ones, if I remember correctly).
(The post above can be used too, the 7.425 will increase preload a tad more than stock but well within stock lifter margin), make the setup less noisy.
Now, while it is better to stay on the shorter side with big cams, the LS6 lifts and ramps do not affect the lifter adversely by a little more preload.
LS6 valves are .0236 inch taller to compensate for the smaller base circle of the LS6 cam.
So .0236/1.7= .014 smaller radius. (extra length p-rod needed)
Some aftermarket 7.40 will work (he can ask the shop to actually measure one for him), some actually measure 7.41 (I think Thunder ones, if I remember correctly).
(The post above can be used too, the 7.425 will increase preload a tad more than stock but well within stock lifter margin), make the setup less noisy.
Now, while it is better to stay on the shorter side with big cams, the LS6 lifts and ramps do not affect the lifter adversely by a little more preload.
