Luke1834

I have a forged bottom end with 232/236 114lsa and .615 lift cam with patriot ls6 heads when my car got to 5800 Rpms on the dyno it isntantly stoped making power.

Darkman

iTrader: (2)

Describe the rest of the valvetrain - i.e. what valve springs, rockers, etc.

Luke1834

It's got ls7 lifters comp gold 1.7 rockers hardened pushrods and it has dual spring from
The previous owner if I had to guess there probably patriot (patriot heads) it's the only used thing I used when I built this motor besides the crank . I'll post the dyno graph in a little basically climbs to 400hp as Soon as it hits 5800rpm it levels out and the line is al squiggly lol

outkast6991

iTrader: (34)

Easiest first step would be to switch back to stock rockers. After that I'd pull a couple springs and check pressures

Luke1834

why would i switch back to stock rockers? I had stock ones on there when it was dyno. then i put roller rockers on because the bearings were going and its exactly the same just quieter

outkast6991

iTrader: (34)

Didn't know you had the float on stockers. Aftermarket rockers are known to be heavy over the nose which will induce float. Guess its time to pull some springs

Luke1834

what new springs would you guys recommend this cam should make power to 6500 rpms and with the forged bottom end i wanna take it that high .

outkast6991

iTrader: (34)

Call PAC and give them your cam specs. They can get you a quality spring with the pressure you need

Havoc40

Springs or lifters. Maybe a combo of both.

Luke1834

The lifters are like new only have maybe 200 miles on them

KRAZY K 2000 TA

iTrader: (5)

Fuel pressure at WOT? Injector size?

TurboBuick6

iTrader: (2)

A very erratic power band is valve float 90% of the time.

Luke1834

It has 30lb injectors , what does erratic power band mean ?

TurboBuick6

iTrader: (2)

Your power band line on the dyno gets very jagged just befor you lose your power.

dr_whigham

iTrader: (49)

I'm guessing you need new springs, AND shimmed to within .050 of coil bind.

Luke1834

I think I'm just gunna get some new springs the valvtrain seems a tiny bit noisy also

Luke1834

that is the dyne 5 days before i switched to turbo 400

Luke1834

Posted dyno graph please tell if it looks ok ?

LilJayV10

iTrader: (39)

This. I was going to ask what your spring height is set at.

LilJayV10

iTrader: (39)

Normally when you have valve float there's a dip at the top end and then it nose dives off. It doesn't appear that yours is doing that. However your tq curve seems to be a little wavy. The local machine shop set my heads up wrong and I had horrible valve float. My dyno graph was really jagged and then dropped off.