valvetrain question
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On The Tree
Joined: Nov 2007
Posts: 134
Likes: 1
From: alabama
valvetrain question 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.
TECH Regular
Joined: Oct 2008
Posts: 492
Likes: 0
From: Rochester, NY
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.
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.
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.............
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