RedXray

I'd say the exhaust is the bottleneck too.

I used to have almost the exact same setup: LQ9, SS2, PAC 1218's, 4.7pr, LS7 lifters, stock 317's, stock TB and intake, built 4L60, 3200 stall etc. The difference between the two is the Speed Engineering 1-3/4" headers with their true duals. Even before I tweaked the tune I could easily hit the limiter set a 6800 RPM. The screen shot below shows 6,434 RPM letting the transmission automatically shift from first into second gear (when I had 3.42 gears). The timing was only set at 24* total advance at that time.

1FastBrick

iTrader: (17)

So went back and looked at the final numbers my buddy sent me. I don't have the sheet.

Fresh LQ9 .020 over, CNC ported 241's, Same Cam from Jegs, a 90mm truck intake 1 year only truck manifold from a 2005 Trailblazer flowing Through Cast iron factory manifolds and Replacement Catalytic Convertors and magnaflow catback exhaust. Also has a cut out on it.

2000 or 2001 Silverado running a 2002 operating system IIRC 12212156 OS with flex fuel enabled.

365 HP / 382 Lb Ft at the wheels on a Dynapac Hub dyno... and it's within 100 miles of Sea level.

chubbza5

Hey Man, thank you for the feedback. Watching your truck on youtube was one of my inspirations for the build. Your garage floor is unmistakable. I know you have since changed from that cam but I agree I think there's more to be had. I have a true 3" flow through on order. I found mandrel bent sections leading into the flowmaster that are less than 2.5"... Also picked up a TBSS intake complete today and have a 90mm DBC throttle body ordered. I'm going to let it breathe and see where it's at. Can't believe you replied, probably my top influence for building this truck.

arthursc2

iTrader: (5)

What's special about an 05 Trail Blazer intake manifold? First I'm hearing of this and am curious

chubbza5

Not as fresh lq9, but there was still cross hatching on the cylinders so I went with it. Picked up a TBSS cathedral port intake tonight. Figuring with no cats and a straight through exhaust, 90mm TB, I'll pick up a bit. Considering some ported 706's, they put up some surprising numbers given the compression boost.

chubbza5

I don't think anything other than it's def a cathedral port intake.

arthursc2

iTrader: (5)

In his post he said it was a 1yr old thing, at least that's how I read it

RedXray

What year TBSS?

2008 and earlier TBSS intakes (12580420) have the correct MAP sensor hold down and PCV nipple. You can use the 2009+ intakes with a little adaptation to the MAP sensor and fabbing a hold down.

The TBSS intake in the video is the 2009+


The 2008 and earlier intake below with the correct MAP & PCV hose connection.

arthursc2

iTrader: (5)

I don't know anything other than what's posted. If I am reading this wrong, someone feel free to correct me; but this post implies that a '05 Trailblazer manifold is 1 MY only and I'm trying to determine what makes it special. Carry on

1FastBrick

iTrader: (17)

That is correct. It is a 1 year only manifold that resembles a standard truck manifold but features a larger 4 bolt Throttle Body opening.

Nothing special other than it was available at the Junkyard at the time. The TBSS style has not come up in local yards and I refuse to pay new Prices for used parts.