![]() The Isky 264 cam or the 274h06 cam I mentioned in another thread will allow you to do this. I prefer to use 1.6 rockers and a cam with about. ![]() 550", after that the pushrod pinch becomes a restriction and you have to start porting.įor a stock set I would recomend getting a spring, lock, retainer combination that will allow you about. 525" lift, but a good valve job can knock your flow numbers up about 20 cfm and the stal up to about. I like a single pattern or a sligt amount of extra exhaust duration for a street engine, especially a heavy viehicle but that is a choice for more low end tq, extra exhaust duration will give you a little more top end. ![]() Click to expand.Cobalt is right, anything past 220 degrees on stock vortec heads and the gains stop on a normal street engine.
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