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why was my 1/4 mile time so bad..?

I love my Chevy Chevette!
Posts: 1
Joined: 05/14
Posted: 05/14/14 11:46 PM

Alright so today I took my truck up to the track to see if my upgrades were worth it.. 5.3 l33 pushing 315 to the flywheel stock. I added some mode like bigger springs a custom grind cam 220/220. Intake and a OK custom tune. Has a corvette servo as well. The truck has 410 gears and runs strong. When I did my run I ran 16.9... I'm shocked. Even tho were in Colorado I didn't except that. Now I ran 2 more times got worse times.. ran again a stock 5.3 and tied. Maybe he lied about it being stock. Should my truck be running a faster time.. what could be wrong..? I changed the oil and put 10 instead or 5 since summers here. Now the oil pressure is at 80. Way to high. Could that be the cause or what..? Any advice? It's also 4x4  

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