For safety/longjevity you REALLY NEED to change the stock springs.
The stock GM springs were marginal for the stock cam let alone more lift and more duration that even a mild perf cam has.
Dont want to chance floating a valve at higher rpms poss leading to a bent valve or worse case maybe poping a retainer/ lock dropping a valve possibly lunching a piston/cyl/block in the process etc.
Scott
The stock GM springs were marginal for the stock cam let alone more lift and more duration that even a mild perf cam has.
Dont want to chance floating a valve at higher rpms poss leading to a bent valve or worse case maybe poping a retainer/ lock dropping a valve possibly lunching a piston/cyl/block in the process etc.
Scott
