Very doable with the right SR design and a set of ported heads.

 

ill try to get the cam card from him so we can get a more accurate profile of the cam. i was looking at tony shepherd's website earlier and saw his dyno numbers for both his setups. he put down 479 with his hydraulic 396 with 190 AFR heads and im assuming a LTX style manifold.

 

I'd say right around 400RWHP. I'm pushing 400 with my set-up with 10:5.1. And just about everything else that you can think of. I think some of you guys are estimating WAY too high.

I mean whats so hard about slapping the thing on a dyno? Just do it, if your heart gets broken then oh well.

 

Keep in mind that Tony's H/R was extremely aggressive. Certainly not a street cam LOL

 

Your high compression 385 is a solid roller? It made 400rwhp? What RPM did it peak? Oh, and I'm sorry.

 

well i would dyno it but there is a slight problem. im about 9000+ miles away from my car right now because im in IRAQ! and im not to worried about getting my heart broken. ill make sure to post the dyno results and label it so you can get a good look at it.

 

Yes and yes. I stopped it at 6500, I usually take it higher but I was leaning out just a little and I thought I was knocking but my optispark was going. It'll be dyno'd again this summer with more fuel pressure and some spray. I bought the car like this from a buddy, so who knows what the tune is like or anything else, but I know it has a closed loop tune on LT1edit; I have yet to take a look at it to see what everything is like but the car runs hard and strong.

I have not had time to take it to the strip either. Maybe the dyno was fudged up? I'm be putting it on a Mustang dyno in the spring, so I'll update then. And don't take my post's off as me being a dick either, I'm just stating from my point of view and what I've seen.

Here's my mod list:

383ci (.20 over w/3.55 stroke) Approx 10.5:1 compression ratio.

 

Well hopefully the dyno you used is not calibrated properly. Any track times? Race weight?

 

Nope, none of that yet. The car was trapping 120's with 350rwhp. I have yet to weigh it also, it is a pig, nothing light of course; but the rear seat is removed, no hvac, no abs, nothing under the dash, 8 point cage, no spare, only 2 front speakers, no airbags, most of the crap under the hood is removed. I wish I had some good pictures, I'd post them so you guys could see, I'll weigh it, dyno it, and track it this summer. We'll see what it can do, I thought 400rwhp and 420 ft. lbs was low for this set-up; You guys think I'm missing something or something could be wrong?

 

Lsxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

 

Not that I can see other than the dyno maybe being out of whack. It just doesn't seem plausible doing 120mph w/ 350rwhp with a f-body that is almost full weight. What did you do to get an extra 50rwhp?

 

After that the car was built. The motor only has about 3500 miles on it.

The thing is, I don't see the dyno being that out of whack, right before mine went on, a 780whp turbo Camaro was on it, and my buddy always dyno's his 1700whp TT Chevelle on the same dyno.

When it gets warm over here in Michigan, I'm going to look this thing over thoroughly, I have the dyno video too, but it's kind of crappy and it's only the car, no graph.

What do you think I should be pushing to the wheels?

 

The the OP, HOLY F-IN big *** cam batman...... Those have to be .006 numbers... if not that thing is gonna peak at like NASCAR RPM's..... hope you can figure out how the stock PCM will crank to 10K..... that manifold is gonna choke at 6600..... To answer your question assuming those numbers are correct although something has gotta be awry... I'd say 450RWHP only cause you can't spin it to optimum due to stock PCM, I have no idea if the stock PCM will even start a cam like that nor be able to keep it idling... something certainly is going to crazy. Your tuner is pobably going to beat you about the neck, chest, head, and shoulders for making him tune that thing.. LOL.... the lift #'s don't match the duration at all.... I'd say 450 again only cause of something that sounds quite unmatched to the other parts. Remember power is in the COMBO not in any one part, but the sum of all of them working in concert....

Okay now to pwnd3r:

Alot more than 400..... first is this an M6???? reason i ask is because my stock crank, hydraulic roller cam, 355 made 422 RWHP with the stock PCM, piggyback DFI and heads that only flowed like 258cfm at .550 lift. My cam was a 236/242 hydro with .556/.576 lift on a 112lsa... your cam is bigger, your heads are bigger, and it's solid roller. any reason why you didn't do shaft rockers???? Just some stuff that stuck out from your build list.... And trapping 120's with only 350RWHP i find hard to believe at full weight. I trapped 119 wth my M6 and my car was making 420+ RWHP.... My 355 was very mild.... 4" mufflex, long tubes, centerforce clutch, MSD 6A box.. nothing crazy.... My new 383 with solid roller with all the bells and whistles put down 480 RWHP on motor and it's a dedicated nitrous piece... Far from optimized for naturally aspirated pulls.... Put down 811RWHP on a good size shot on a plate system from nitrous pro flow....

So yes I think your power levels are low for what you have.... Should at least be 425-450 RWHP....

 

yeah outlaw im still working on the cam card for it so we can get the real skinny on her. as for the car not wanting to start she fires up just fine. but like i said im working on the card because i want a more accurate guess than what everyone is throwing out because of the cam. oh and are you going to be taking down tony this year?

 

Well I beat his time from last year by .02 I think.... He went 9.56 without 2nd gear and I went 9.54 after shutting down at 800 feet.... So his car has more and so does mine.... I know his project is coming along. My car is sitting at the fab shop and should be able to make all out "all the spray we can throw at it" passes in the next month or two.... I'm hoping that sometime late February I put down an 8 second pass....

 

I dont think you have 12.5 to 1 compression unless you got a 53 cc head AND a zero deck or a dome piston. And if you DONT have 12.5 to 1 that cam is KILLING you, you dont have any cylinder pressure.

Are these numbers you are giving from a Mustang dyno???????

 

See thats the thing, I bought the car the way it is, so I don't know that much about it; As stupid as it sounds.

No it wasn't a Mustang dyno. I have a run scheduled this spring to put it on a Mustang though with the fuel pressure turned up. I can't get ahold of the guy I bought the car off of, so who knows what's done to it anymore. The car is in storage right now but this weekend I'm gonna go start it and let it run and check the numbers on the heads to see if they are in fact Lsx heads. Then when I get an oil change I'm dropping the pan to check everything out.

I appreciate the replies guys, and I'm sorry I thread jacked.

 

See with the 385, I came up with this over the internet. This is why I'm going to check the head's serial's.

385ci = 384.569ci actual w/4.040" bore and 3.750" stroke
5.700" rods & 4.039" dia pistons w/4.040" rings & 0.3" land or
6.000" rods & 4.039" dia pistons w/4.040" rings & 0.3" land
Compression ratio: 11.7:1 w/54cc chamber & 0.049" gasket
Compression ratio: 11.6:1 w/55cc chamber & 0.049" gasket
Compression ratio: 11.4:1 w/56cc chamber & 0.049" gasket
Compression ratio: 11.3:1 w/57cc chamber & 0.049" gasket
Compression ratio: 11.2:1 w/58cc chamber & 0.049" gasket

 

Heres how mine breaks down to get 12.5 to 1


Deck .0006(basically a "zero" deck)
Gasket .039
Flat top 7 cc relief(oddball I know,long story)
53cc chamber
3.75 stroke
4.030 bore

Adds up to 12.48 to 1

Somehow I dont think your there.

And a .049 gasket? Who makes that? The Fel Pro 1074 which is what most use is a .039 and you have the Impala thats a .029.


WIth the numbers you gave I come up with 11.45 to1

.049 gasket
54cc head
4.040 bore
.029 deck(standard nominal deck height)
3.75 stroke
5 cc relief(pretty standard)

Same numbers with a ZERO deck, same head gasket is 12.37 to 1

Same numbers with a ZERO deck and a .039 head gasket is 12.73 to 1

WIth a standard deck(.029) and a Impala .029 gasket its 12.07 to 1

If that engine doesnt have AT LEAST 12 to 1 that cam aint gonna fly.

When you make more torque than HP on a chassis dyno with a manual trans, something is outta whack.

And BTW that engine needs 42lb injectors.

 

David, what if you make the same amount of hp, as you do tq? Just a thought.

To the PWN3DR, if you bought the car that way, I would make sure you could verify all the performance parts, that the seller told you about..It never hurts to double check, something like that.