Just thought I would share my LS stroker build with you guys. Been collecting parts since last August and got the car home from the shop last Friday. Needs to go back for some final tweaking of the tune when roads are more suitable for some road testing and get some better gas in the tank. Check out the video! Cant wait to enjoy it.

Dynojet:
Base line #s 324hp / 338tq
After #s 411hp / 365tq

- LS6 Forged 383 Short Block w/ Callies crank/rods and Mahle pistons
- TSP Precision Race Components LS6 stage 2.5 CNC ported cylinder heads. Fully CNC ported LS6-based cylinder heads! NEW GM 243 castings
- 2.02"/1.575" Stainless Steel Valves
- PRC Double Spring Kit complete with Titanium Retainers, Seats, & Seal
- Yella Terra 1.7 rocker arms w/ ARP mounting bolts & Hi Tech Pushrods
- Milled to a 60-61cc combustion chamber
- OEM Head gasket – GMPP# 12498544 Approx. compressed thickness is 0.059-0.057.
- LS6 intake manifold w/gaskets. OEM coolant crossover block off kit needed to go from LS1 intake to a LS6.
- LS6 Vented Valley Pan Cover, w/gasket and low profile bolt kit and valley cover to intake manifold hose
- Comp Cam XR281HR-12 – 228 / 230 duration .571 / .573 lift 112-lobe separation. Camshaft retaining plate w/bolts
- TSP LS6 high flow ported oil pump with new o-ring, GM Harmonic Balancer w/keyway matching
- Ford Racing #397-M-9593-BB302 Fuel Injectors 30lbs.
- Ceramic-coated Stainless Works 1 7/8 Off Road w/X-pipe Long Tube Headers
- OEM head bolts, OEM Valve cover gaskets, OEM Timing Chain Cover Gasket, OEM Water Pump Gaskets, OEM Crank seal, OEM Oil Pan Gasket, OEM Rear Timing Cover w/rear main crank seal- OEM Harmonic balancer bolt
- NGK TR55 sparkplugs & MSD 8.5 Wire Set & Koolsox Spark Plug Insulators
- Fellpro header gaskets.
- LS7 Lifters
- Rollmaster Double Roller Timing Set
- LS2 Lifter Trays w/bolts
- LS7 Clutch Disc, Pressure Plate Flywheel, Slave and Pilot bearing and remote clutch bleeder kit
- LS1 LS6 160 Degree Low Temp High Flow Thermostat

 

Nice. That combo should rip some mid-low 11's with a good launch

 

Maybe I'm missing something here or you mis-typed your dyno numbers, but if I spent the kind of money it costs for a forged 383 LS6 stroker and it only made 411 rwhp, I would burn down the shop that did the work! I know your cam and heads are pretty mild, but you should be making AT LEAST 450 rwhp and 450 rwtq. If you have a dyno sheet, post it up in this thread so we can see what the curves look like. If the numbers you posted are really the numbers, something is VERY wrong! Just sayin'.

Jimbo

 

[QUOTE=ZZOOM06;1577245141]Maybe I'm missing something here or you mis-typed your dyno numbers, but if I spent the kind of money it costs for a forged 383 LS6 stroker and it only made 411 rwhp, I would burn down the shop that did the work! I know your cam and heads are pretty mild, but you should be making AT LEAST 450 rwhp and 450 rwtq. If you have a dyno sheet, post it up in this thread so we can see what the curves look like. If the numbers you posted are really the numbers, something is VERY wrong! Just sayin'.

Jimbo

I thought the #s should be higher also. I only have the printouts now and don't have scanner here.I will try to post them soon. I like to here the feedback! I was told the tq was down due to the 1 7/8 lts and 3" all the way back. Hopefully the #s will improve when I run the old gas through and they do a little tweaking on the tune when the winter weather finally takes a hike and the roads are a bit more suitable for some road testing/tuning.

Brad

 

[QUOTE=$b_rad!;1577245308]

 

[QUOTE=$b_rad!;1577245308]Brad,
I was just talking to Jimbo and realized I misread your post. I was thinking you had a forged-stock LS6...Not a Stroker. My 383 has a mild (not too radical) cam and I am near 480rwhp with a 390 gear. All my stuff is out of the box, no porting\polishing. I don't get it unless your on a Mustang dyno and even that seems low.

 

[QUOTE=$b_rad!;1577245308]Brad,
If anything, the 1-7/8" LT's and the 3" exhaust should give you more hp and tq. When I did my stroker, my engine guy told me to make sure I opened up my exhaust, and my numbers show that he was right.
I have numerous friends with 383 strokers, (including Pit-Man) and they are all north of 450/450,,,,maybe you need to find another tuner.

 

the numbers do seem be to a bit low . . . are you planning to put any power adders on?

 

What do you mean by power adders......F I or spray?? I don't think so

 

yes or nitrous - just curious why you went forged

 

This all started to be just a head/cam/intake swap but the shop I dealt with happened to have a assembled short block ready to go.

 

Brad,
gaining about 90 rwhp with a H/C/I are not bad numbers ... dyno numbers don't mean a whole lot to me other then to compare before and after (doing mods) ...

Best of luck with the new build and enjoy your new found power

 

Here is the dyno sheet.

 

A local had the same cam and some 243 heads ported by a local shop. It did ~440rwhp and ~440rwtq.

The setup was mild and drove very nice, running into the 11s.

http://forums.corvetteforum.com/c5-c...-for-sale.html

The 1 7/8 and 3" would cost you some tq but not as much as you are showing. Something is off somewhere , I think you'll like it once sorted

 

something is wrong! a 23X/23X cam only 346 Z will make more than that.

I think you got shafted! some crook charged you for a 383 and shipped you a 346.

 

Not wanting to get a guy while he is down but....those #s are low for a346.

 

I had 414 rwhp (mustang dyno) and ran a 10.76 . . .

what throttle body are you using?

 

If your tuner told you that 1 7/8 LT's and 3 inch x-pipe drops your RWT reading....you seriously need to find a new tuner. I agree that the numbers are very low. I would expect that setup - even with the smallish cam for a 383 - to be closer to 470RWHP or so.

 

I think he's got a "bottleneck" somewhere ---> TB - CAI
there's a lot of CI there and nothing really feeding it IMHO.
also, might be maxing out the injectors

 

Still using my stock 75mm 99 LS1 TB on the new LS6 intake, with a Blackwing CAI annd a higher volume CF air bridge. Im sure a Fast & a 92 would help. Keep in mind my car had the gas in it from last fall and might have even been reg grade. Hopefully when I go back in a few weeks with fresh higher octane fuel with a few road tests they can bring those #s up.