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Old 12-25-2006, 03:59 PM   #11
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Quote:
Originally Posted by OLDsman105
My car has had 157,000 poorly mistreated miles from its previous owner. To be honest I was just planning on going with re-worked stock rockers and leaving the rest untouched including the springs but I might reconsider that. I hadn't planned on shifting past 6,000 anyway just due to the fact that the 4T60 transmission doesn't like going that high ( issues with the pump loosing effenciy after 6X00 rpms, the 4T65 trans doesn't have this issue ).
If your just doing the reworked 1.9'*, then I would go with 105lb. springs as well and thats it. In fact, if you plan on leaving the shift points stock, you shouldn't have any issues sticking with stock valvesprings. I guess maybe I'd go with the reworked stock rockers and then if you end up getting float later then I'd maybe pick up a set of 105lb. springs. OR pushrods would IMO be a waste for that setup.
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Old 12-25-2006, 04:42 PM   #12
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Quote:
Originally Posted by dbtk2
Quote:
Originally Posted by OLDsman105
My car has had 157,000 poorly mistreated miles from its previous owner. To be honest I was just planning on going with re-worked stock rockers and leaving the rest untouched including the springs but I might reconsider that. I hadn't planned on shifting past 6,000 anyway just due to the fact that the 4T60 transmission doesn't like going that high ( issues with the pump loosing effenciy after 6X00 rpms, the 4T65 trans doesn't have this issue ).
If your just doing the reworked 1.9'*, then I would go with 105lb. springs as well and thats it. In fact, if you plan on leaving the shift points stock, you shouldn't have any issues sticking with stock valvesprings. I guess maybe I'd go with the reworked stock rockers and then if you end up getting float later then I'd maybe pick up a set of 105lb. springs. OR pushrods would IMO be a waste for that setup.
I had come to that conclusion as well. For now I am going to get reworked 1.9s. But there is always the future

Thanks again for the info everyone.
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Old 12-25-2006, 08:23 PM   #13
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Originally Posted by dbtk2
FWIW, I have stock lifters and pushrods on my GT with 90lb. valvesprings and I have spun it to 6800rpm on numerous occasions without any problems at all, doesn't seem to have any valve float, and makes very good power at those rpms as well.
x2
I had my L36 up to 6800 with stock lifters and 90# springs. They were lower mile L32 lifters though.
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Old 12-25-2006, 08:30 PM   #14
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It should be pointed out that stock S2 valvesprings are 75#.
Stock Series 1 valvesprings are 80#.

So those 90'* are an upgrade. Just use the right spring for the right application as suggested by the vendor you buy your package from, or the members here who have done it (as posted).
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