andrew ws6

Ok my car has a 355, stock headed with sa 1.6rr, cc503 cam, and full rebuild in it, it dynoed 343hp at 5400 and 362tq at 4600. Problem is at 6000rpm power falls off its *** on the dyno, but it feels strong all the way to 6500, but also has an occasional break up above 6000rpm so I have quit pushing it past 6000. My question is I want to upgrade my rr with nsa stuff to try and help, am I doing right or is my cam just giving up.

tbag_skywalker

Are you running stock valve springs?

If you are, I would strongly recommend getting a good aftermarket set. Stock LT1 valve springs are nothing special and will float a bit when pushed anywhere past stock red line.

I'm on a stock cam, but gained roughly 3.7mph in the quarter just from doing Patriot valve springs and Comp NSA rockers and hardware.

Best trap before springs and rockers was 107.2
Best trap after was 110.9.

Same exact weather, track conditions, tires, 60', everything.

andrew ws6

30lb accel 255 walbro pump, rr are cheap summit brand valve spring were recomended by a well known port shop

defaultexistence

iTrader: (11)

Prob running outta fuel? What's fuel mods?

andrew ws6

30lb accel 255 walbro pump

quik95lt1

iTrader: (7)

exactly what spring did you run on the head? whats the seat and open pressure and also are they installed at the correct height?? also watch your injector DC% above 6000 rpm if its anything above 85% buy bigger injectors.............

andrew ws6

I don't recall the scecs on the cam they were recommended by le for that cam I have no way to check dc on the objectors is,there a scanner that will tell you that stuff

Mystery Bird

iTrader: (7)

Datamaster or Freescan for inj. duty cycle.