natejk

iTrader: (4)

Engines almost finished just waiting to get the intake and heads back from machine shop!

Engine:
- 408ci 12.5:1
- Callies compstar rods/Crank
- Wiesco +5cc pistons tool steel pins
- WCCH Stg3 l92 heads PAC1208X Springs
- Smallwood Racing Development HR nitrous cam 259/279 .652/.632 114+4
- Morel lifters 5315
- 3/8 pushrods
- 1.7 ratio t&d shaft mounts
- Edelbrock Super Victor 4500 flange done by Fast Forward race engines
- Accufab 4500 TB
- 78lb dietsch werks injectors
- 1 7/8 inch primary 3" collector
- Magnafuel 750
- Nitrous outlet stinger plate with progressive


Trans:
-Built 4L80E Full Manual with Trans brake
-PTC 4500 nitrous converter
-PST Driveshaft

Rear:
-8.6" 10 bolt 4.11 Eaton (weak link)
Calvert Caltracs and there 9 way adjustables

This is going in a 2004 RCSB Silverado

ragtopz28

iTrader: (57)

I'll play...725-750 at the tire. Good luck getting it to hook at the track, haha

DietCoke

iTrader: (18)

To be honest, it needs different springs to work in the RPM range it's going to make power in. I love the BTR plats, but they aren't really the ticket for an 8k rpm deal with a .650+ cam.

natejk

iTrader: (4)

I was actually discussing that with the guy doing the intake yesterday. Might make a change there should've just went solid roller haha

blk00ss

iTrader: (66)

Some PAC 1207x or even 1208x would be a better choice.

natejk

iTrader: (4)

I'll look into them the heads came with the tooley springs on them already

natejk

iTrader: (4)

You think 1207x/1208x will be ok with stock rocker arms?

blk00ss

iTrader: (66)

No. But I wouldn't be running stock rockers with a build like this either.

natejk

iTrader: (4)

They have the trunion upgrade done to them I know they get funky anything above .675 lift

DietCoke

iTrader: (18)

1207x work with stock rocker arms, I had great luck with them on my 430.

sbf

i would think it should make 500rwhp on motor and 700 or so on nos

axe murderer

iTrader: (3)

That's a pretty serious build, .650 lift is kind of high with stock rockers.
I think I've seen threads on here where Brian said .620 is the most they recommend with stock, I'd bet the cam lobes probably have to be considered also.

natejk

iTrader: (4)

When I talked with Martin about it and he specd the cam it was specd to run the stock rocker however we did not talk about spring pressures I think I may order the 1207x springs and then get a better rocker down the road after I recouped some money

NAVYBLUE210

I was told by CHE .630" lift, ~ 420 lbs open pressure (without increasing the bolt
size on the rocker) and moderately aggressive lobe profiles (CAMMOTION) was
The envelope edge they were comfortable with. Really Challenging to get a good
Wipe pattern even @ .630" lift with the stock rocker.
Good Luck

1989GTA

I pretty much agree with that. I had a Cam Motion camshaft with .629" lift and around 415# on the spring. It was working just fine but I think it was right at the limit. I also had the stock rocker arm trunion upgrade. I have since gone to a LLSR from Cam Motion.

natejk

iTrader: (4)

The 1207x's are 436lb so I will be triple checking. If the patterns not good I'll have a set of ls3 rockers for sale, anyone have thoughts on these
http://www.briantooleyracing.com/685...ers-sk701.html

axe murderer

iTrader: (3)

Post #13
https://ls1tech.com/forums/generatio...l#post18313082

natejk

iTrader: (4)

Not sure what your asking about. Which do I have? Or which will I get later on?

natejk

iTrader: (4)

I clicked the link I wish I would've came across that before I did the trunion upgrade maybe I'll just sell these now before I use them

axe murderer

iTrader: (3)

That's where I'm @ now, have a set of stock LS3 rockers with a new Comp trunion kit & figure I should probably sell them & upgrade now instead of gambling with them plus they're worth more being never run.
I've read some guys claimed premature wear with higher lifts & stock rockers.