thecamaroguy98

My 408 dyno'd at 479 hp @ 6210, 445.7 tp @ 4560.

My set up:
Eagle LS1 4.00 Stroker Crankshaft
Diamond Racing Forged Pisons 4.010 bore 4.000 Stroke Flat-Top -2cc
Cam: 248/254 .625"/.622" 112 LSA
Heads: PRC Stage 3 LS6 Heads 2.08/1.60 Valves 64cc Chamber
LS7 Lifters
Fast 92/92
1 7/8 Hooker Headers

I was hoping for 500, I'm pretty happy maybe a little dissapointed.

I was thinking after I finish the exhaust (td's mandrel bent) & get the Fast intake ported I could break 500. Do you guys think thats pretty reasonable?

I was also thinking of selling the PRC's for some TFS 235's

thecamaroguy98

I forgot to mention...This is through an M6 with a 10 bolt. The next dyno will be with a 12 bolt.

Abdullah

iTrader: (2)

i would say try to either get the PRC 2.5 LS6 heads or hand touched up (by a good porter) TFS 235cc heads. also raise the compression to 11:1 or up to 11.8:1.

GMCHammer

iTrader: (4)

I would get the Intake/TB ported first! Then slap her back on the dyno. If your not happy with the numbers go with the TFS next!

98Z28CobraKiller

iTrader: (17)

Or an AFR225. 235 cc on a 408 is not neccesary. Specially if you arent going to spin it over 7K RPM.

the_merv

iTrader: (88)

Isn't that a 404ci with that 4.010X4.000 setup?

built408

iTrader: (10)

Yap, thats not a 408

edcmat-l1

iTrader: (10)

That's pretty low, esp the torque numbers. I'd ditch the heads for some TFSs

2001 Pewter WS6

iTrader: (43)

The TFS 235's work really well... What did the rest of you exhaust consist of???

rpmauto

iTrader: (14)

very similar to my results, i just got some 1 7/8" headers, after next season a better cam and some afr heads should make over 500 easy.

White_Hawk

iTrader: (3)

Got the dyno chart? Might be something on there one of the guru's here could spot.

-Geoff

ndfrsd6

iTrader: (5)

with 241 heads 90/90 setup 1 7/8 hooker headers same cam my 402 made 500 rwhp and 469 rwtq .....with bigger heads and cam i know i have a lot left on the table ....but the budget comes into play LOL...

thecamaroguy98

When it was dyno'd it had Flowmaster Super 44's on the collector of the header. This spring it's going to a custom exhaust for a mandrel bent 3" setup over the axle...

I'm thinking that the exhaust setup probably hurt me a lot

Sales2@Texas-speed

iTrader: (5)

Something else isn't right here. With a GM MLS head gasket you'd be netting about 11.6:1 or with a Cometic .040" you'd see about 12.0:1. What octane gas are you running? Who tuned it? What does the timing table look like? What's the air/fuel? Any knock retard on a scan? What Y-pipe and catback?

The last combo we engine dyno'd with the exact same setup made 625hp/585ftlbs. I'd highly doubt you're seeing 25% loss to that drivetrain! Let's see a graph and maybe a scan of the car and we can figure out what's going on before you dump $2400+ on heads.

thecamaroguy98

Matt,

You have a PM, since this is a TSP Motor.

thecamaroguy98

I have no scanner, but I'll see what I can do.

Cokeroker

iTrader: (9)

383 with 241 heads 90/90 setup, TSP Giant Cam (622/622), Pacesetters, M6, Ford Nine Inch on 325/50/15 MT, mine made 497/453 at the wheels.

Sales2@Texas-speed

iTrader: (5)

What wasn't mentioned is that the numbers are from a Mustang dyno. Between that and the Flowmaster exhaust, the numbers aren't far off from what you'd expect on a Dynojet with a better exhaust setup IMO.

edcmat-l1

iTrader: (10)

Ah, yeah. The Mustang could def make a big difference.

WS-Sick

The fact that it was on a mustang dyno should have been mentioned in the original post. There is nothing wrong with those numbers. I'm sure more power could be achieved with some changes others have mentioned but those numbers seem right for your particular setup on a mustang dyno.