ZZ06

Well first I must say I am stoked and really shocked about the torque curve and power at 2500rpm being over 400tq+ (good ole 243's). But I would be lying if I said I wasn't disappointed in the hp. Espically for a 418ci. My tuner did point something out and made realize that cats I still have on the car could very well be damaged and clogged. Especially since the reason the motor got replaced in the first place was due to hydrolock. Sooo called LG and have delete pips coming next week. I know my 1 3/4's are somewhat restrictive as well. Under cammed perhaps??? Any words??? build...

TSP 418
Weisco -4cc pistons
4.080 bore
Callies 6.125 rods
Callies 4.000 crank
Cometic .051 gaskets
11:3.1 CR
EPS Custom 240/248 .630 .603 116lsa
LS7 Lifters
Trunion Upgraded rockers
42lb injectors
Elite Engineering Catch can
SDPC blue printed oil pump
FAST 92 (not ported)
LS2 90mm TB (not ported)
TEA 243's Stage 2s
1 3/4 LG Street headers
Halltech Venom Intake
SLP UD Pulley
Corsa Xtreme's

PRE-Z06

Good compression and healthy cam, curious why they stopped the pull at 5700? Definitely better heads, a 102 intake and 1.875" headers would help up top.

ZZ06

Yea im aware 1 7/8 would net better. There was another run where he spun it to 6200-6400 but it was flat. 5700 seemed to be all she had. These LG streets have been on the car since 2010. When I purchased these I didn't quite have a full understanding of the sizes and future power, yada yada. Shoulda coulda woulda now. I believe there are cheaper ways to reach it w/o spending on headers first. FIRST, getting rid of those high flow cats. Yes high flow, less restriction to begin with but again, 4+years old and water logged for 10 months with damage unknown. Once I remove, will see what happens. SECOND (if not satisfied, good chance I wont be) will be to port match the 92 to the heads. This build obviously wasn't a max effort, infact, it was a budget build that originally was gonna have a LS6 topend. A short notice deployment netted the FAST and TB.

aaronc7

Did HP remain flat/level until 6400 rpm or did it start to decline after 5700?

ZZ06

Uh I believe it remained flat. He did 2 other pulls. But this is the one that got printed out. I will be hitting the dyno again in another week with the delete pipes in place. I have something going on. I had a few bad stumbles under acceleration around 2200-2400rpm lastnite when my wife and I were headed to the movies. Infact, this leads me to believe A, those cats are toast because I had this happen on the OLD motor on the freeway cruising in 6th at 75mph a few times. Or B, a potential coil pack going bad. ALOT got replaced with the new motor, so its not pulgs and wires. Its got to be one of those 2 items. Im leaning hard towards clogged cats.

pit-man

Still not bad on power...485/485 will get it done with the right setup

Sigforty

The cats and LG street setup is probably holding you back. If memory serves me right the LG street setup is a 2.5" exhaust all the way back. You really need to step up to the LG Pro 3" exhaust to let that breath.

~STOLEN~

seems like a stout build....could be a car that puts down 480 but runs like a raped ape, would prob react very well to N2O ya know :-) how is it driving compared to orig motor?
116 lsa thats a lot imo

ZZ06

Yea Geoff took me saying drivability to heart. Honestly, I could've handle it fine on a 114. Hell the last one I had was on a 112 with a few more degrees in overlap. Compared to the last motor, it runs like hoss!

ZZ06

Thanks pit!!!

ajrothm

Definitely need to re-dyno after the cats come off... No telling how much they "could" be hurting you. Rest of the combo looks solid and pretty well matched. I think the cam is a good fit. Ofcourse 1 7/8" headers "may" gain you a few hp up top but...not worth the money for sure.

I'd pull the cats, get it back on the dyno and go thru the tune again and make sure it's right.

484 STD is only 470 SAE so..... You are missing 30-40hp somewhere. It looks choked up top judging by how early it peaks and just holds there..(cats)

I would probably do a compression test and make sure all of the cylinders are where they should be. If so, then just drive and enjoy it.. It's way too easy to get caught up in dyno numbers and what they "should" make..

VGLNTE1

Seems right on target for 243s with converters. Go get a trap speed.

ZZ06

Thank you! After settling down, I realized im just shy of what im looking for.I believe with the budget I had, I didn't do a horrible job of parts. Im absolutely in LOVE with my torque curve and how it feels on the road. Delete pipes came in the mail yesterday. Will be putting them on them on this weekend and hitting the dyno again within the next 2 weeks.

VGLNTE1

Ya, its hard to swallow 4-6k on a short block to make under 500 hp, but a built motor doesn't mean more power, just better quality. I have a 416 built like a brickhouse. Made 467 on a mustang dyno. Buddy on the same dyno made 630. Our trap speeds are off by 2mph...lol. same track, same day. Dyno numbers mean absolutely nothing. Plus, if it feels great and you are happy, then job well done

ZZ06

Got the cats off the car today! Well not clogged from the looks of it at least. But a restriction that needed fixed none the less. Will hit the dyno again soon....

ZZ06

Hit the dyno today. I didn't reprint the graph because the torque reading was all jacked up. lol it read like I had 942tq:burn:. As expected since I saw my cats turned out NOT to be clogged. It gained 4hp up top, BUT in mid 3k rpms she picked up 16hp!!! Sooo all in all 489/486. Im happy. My tuner got her running much smoother than before. A cam my size, with my power and I can roll in 4th gear at 35-37mph and just as smooth as butter Decided not to port the intake. I mean I know Id see the 500 and probably not much over it. Not gona chase numbers. Maybe in a few years, I will get another wild hair up my *** and go all out with it but for now car feels awesome!!! Saw 6th gear for a few minutes today around 75mph and she manages 23-25mpg. Ill take it!!!!

BLWN1

08+ 4.8/5.3 trucks come with a 90mm tb? Don't think it need more intake? Heads seem borderline smallish also?

Anti_Venom99

Good numbers for the set up! It's the heads that are holding you back though. 243's are great heads for stock cube but just can't handle the air flow produced by a 418ci. My buddy had a 408 with AI ported 243's in a manual car and made 497whp(f body). This was only 25whp more than his ls1 with the same heads made. It made gobs more torque and was much faster however. He then switched to an AFR 230 head that was ported. He used the same cam and the car put down 547whp... if he would have changed the cam to match the heads I would have bet it made 560+ easily. Just my .02 👍

TXGS507

I have a built 414 (LS2 based) stroker w some 799's done by TEA... Ported FAST 102 and LG Super Pro's 1 3/4..... Mine made just shy of 560rwhp and 530ftlbs of TQ.... With the 150 shot it puts down 688/718.... As I type my car is at the shop getting the AR 1 7/8 headers installed.... Its' HOT here in TX so I don't expect great gains at this point... but once it cools down I expect a decent gain.
Before someone jumps in giving me hell about paying $1700 for 8-10 HP gain.... I have a friend demodding his C5 to step up to a C6GS... I already have my LG's sold... I'll have about $350 in these headers... Def worth it....
I run my car in the 1/2 mi events and THAT is where the 1 7/8 will shine.... Although we are only racing for 1600 ft of that 1/2 mi I still trap @ 155.... Hoping for 158-160! to me that's money well spent.
To the OP.... there is still plenty of HP/TQ on the table.... Yours sounds like a great build!

Cordes Performance Racing

Your build falls into the the trap of others that don't make good numbers when going big motor. You skimped on the heads and headers. See it a lot, people spend the budget on the bottom end and neglect what's important, ie heads. Put a real set of heads and better headers and watch it pick up a ton!