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Old 06-01-2004, 10:58 AM   #1
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Car: 1991 Camaro Z28 5.7 G92
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LT4 HOT cam+Vortec heads RW dyno numbers inside!

I went and finally got my car up on the chassis dyno. I will try to get a scan of my graph, but here are the numbers:

329.8 rwhp @ about 5800 rpm
356.2 rwtq @ about 3500 rpm

over 350 rwtq from 2500 all the way to over 4300!:hail:

My torque curve was as flat as a board. The wide band O2 showed I was running rich in the low 12's for a/f ratio when the secondaries came on. I plan to jet up the back barrels and i should pick up another 10-15 HP. Not bad for untouched Vortecs and a HOT cam running only 1.5 rockers with .492 lift. 600 cfm carb. I calculated my motor to be at 405 hp at the fly wheel and 434 ft lbs of torque.

"Don't torque to me about torque!"
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Old 06-01-2004, 11:06 AM   #2
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That looks about typical for that combo. Right where it should be.

You could pick up a good bit on the top end with a more appropriately sized carb.
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Old 06-01-2004, 01:19 PM   #3
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Very nice. I remember reading about some guy who has the exact same combo and he did some dyno testing. He made about the same HP as you but then gained like 20rwhp just by putting a single plane intake on it.... Of course he lost some low-end torque.

I'd definately say get a bigger carb on that beast to see its full potential.
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Old 06-01-2004, 02:53 PM   #4
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Great numbers (now put a real cam in there and see what she can do!!)
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Old 06-01-2004, 02:58 PM   #5
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I would like to see another cam make over 350 ft lbs below 2500 and all the way up through 4500. Sure I could put a big solid roller in , but this is a streetable motor that gets good gas milage. Even an XE 274 or 284 would prolly get me more top end HP, but not the torque down low where I need it.

600 cfm carb: I did try to put a spacer on it, and a bigger carb(750) they gave me a little more top end and lost a ton of bottom end. My 600 carb is jetted down almost all the way and it is still rich. I do want to go to a demon 650 though.
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Old 06-01-2004, 11:57 PM   #6
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Here it is!

I like torque.
Attached Images
File Type: jpg gasgzlrrwhp.jpg (48.8 KB, 599 views)
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Old 06-02-2004, 12:10 AM   #7
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Sweet, I've been wanting to see more dynos from conservative stock Vortec setups. I need to get the guides cut down and run some 1.6rrs on mine and see what it dynos in car (with a XE262, Perf RPM)... So many of those engine buildups in all the mags lose a bit of usefulness by not being dynoed in-car how it will actually be run... I'd be extremely happy to get that kind of power to the ground.
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Old 06-02-2004, 10:49 AM   #8
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witha xe274 youll be over 375 RW..

i know a guy with the same combo as you, with a little more carb who puts down 380rwHP and 377rw TQ

the 274 is a 224/230 .500 .510
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Old 06-02-2004, 11:59 AM   #9
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With a small 600 and shortie headers, those are really good numbers!!
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Old 06-02-2004, 12:05 PM   #10
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double post

Last edited by Streetiron85; 06-02-2004 at 12:13 PM.
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Old 06-02-2004, 12:10 PM   #11
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Quote:
Originally posted by GASGZLR

600 cfm carb: I did try to put a spacer on it, and a bigger carb(750) they gave me a little more top end and lost a ton of bottom end. My 600 carb is jetted down almost all the way and it is still rich. I do want to go to a demon 650 though.
I was wondering, was the 750 that you tried a DP or VS?
Thanks for showing us your charts... looks good.
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Old 06-02-2004, 12:11 PM   #12
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GASGZLR,
Just noticed your location. Where did you do your dyno run? If it was in the Sante Fe/Albuquerque area, members must realize your at over 5000 ft. Even at the most conservative figures, there will be a 2.5% loss of power for every 1000 ft. That would be a loss of 12.5 % total. Are you numbers altitude corrected or actual? If actual...those are extremely good numbers.
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Old 06-02-2004, 01:43 PM   #13
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I got it done this saturday at DynoEdge off Juan Tabo. Those numbers are not actual but corrected for sea level.

f-crazy, I doubt you know anyone who has a hot cammed 350 running 1.5 rocker arms. Also with a Edelbrock 600 carb and shorty headers and UNTOUCHED Vortecs, NO porting.

I figure I can get some serious power with ported heads and 1.6 rockers, along with a demon 650 carb and longtubes.
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Old 06-02-2004, 01:45 PM   #14
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I cant read it on the dyno graph, what corection factor was used?


SAE???
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Old 06-02-2004, 03:35 PM   #15
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Doesn't the HOT cam spec at .525/.525....or is that with 1.6rr's
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Old 06-02-2004, 04:23 PM   #16
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Yes thats with 1.6 ratio.
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Old 06-02-2004, 06:25 PM   #17
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My reason for asking about the carb earlier was because, while it's true that the dyno doesn't lie, in the real world, dyno conditions aren't often duplicated exactly.
Lugging your motor with the secondaries wide open isn't something that would be likely to happen if you know how to drive, and that's what the dyno test was simulating.
If you went to a 750 carb, the real world bottom end loss would be unnoticable, while the top-end gains would be something that you'd definitely benefit from.

I'll put in a vote for the larger carb.

Hope this is helpful
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Old 06-02-2004, 07:47 PM   #18
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Quote:
Originally posted by GASGZLR
f-crazy, I doubt you know anyone who has a hot cammed 350 running 1.5 rocker arms. Also with a Edelbrock 600 carb and shorty headers and UNTOUCHED Vortecs, NO porting.
yea your right it is a small world

the vortecs flow 240@.500 and 170 exhaust...no doubt a well flowing head..very VERY similar to what LT1's with some minor port work or stock LT4 heads flow (242/180)...the intake dieffence between a carb and FI wont make much a difference on peaks...

why dont you check out www.camaroz28.com...and look at how many hotcammed 350's with 1.5's and shorty headers there are...
like i said the intake wont make much of a diff. MAYBE 8-10 hp

all the hotcammed cars on that site are right around 330-340RWHP and nearly identical torque as what u put down...
feel free to check it out and prove me wrong, but as i said that combo is VERY similar to what 1,400 people are running...

and as i said before the combo im running is LT4 heads (very similar in OVERALL flow to vortecs) carbed intake with a 650 DP and the 224-230 cam...this combo has put down 380rwhp with EFI and no tuning...
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Old 06-03-2004, 09:45 AM   #19
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OK, I figure an Airgap intake and Holley DP carb would be worth 20 hp at least, but I am not going to touch the motor anymore. I don't care if it is not running 380 rwhp, I like it the way it runs now and I was just curious what my HP was. The reason I posted this is because I would have liked to see these numbers before I built my motor , and hopefully I inspired some one else to build another HOT cammed Vortec motor that runs low 12's.
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Old 06-03-2004, 01:35 PM   #20
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Quote:
Originally posted by f-crazy

and as i said before the combo im running is LT4 heads (very similar in OVERALL flow to vortecs) carbed intake with a 650 DP and the 224-230 cam...this combo has put down 380rwhp with EFI and no tuning...
Wow this makes me feel great... If that's true I should be putting down about 430rwhp, according to my mods. Anyway my car has been down for a few weeks as I'm trying to locate a short in my wiring harness that cuts out the tach signal (spark) I hope to tune it some more then. Anyway good numbers with that 224/230 cam.
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Old 06-03-2004, 05:17 PM   #21
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I agree, those are good numbers... I'm inspired!
Only I wanna use LT4 heads.
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Old 06-04-2004, 08:17 AM   #22
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I hope I get numbers close to that. I'm using a Hot Cam with 1.6 RR , but I'm using a set of ported 416 heads instead of Vortecs. Your numbers give me hope.
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Old 06-04-2004, 12:19 PM   #23
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I dont care what anybody says GASGZLR I think your setup is awesome. You cant go wrong with a low 12 second, 5spd, streetable setup.
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Old 06-04-2004, 01:21 PM   #24
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I agree, nice package you put together there.

There are always the nay-sayers and bench racers who can one-up you all day long on the internet, LOL.

But at the end of the day its your car, your motor, and your cash.

As long as your happy the nay-sayers and bench racers can stick some socks in their mouths and show a little respect.

I bet you have very little invested in that motor and I am sure it pulls like a ****.

Anyway though, I asked earlier and got no response, what was the correction factor used in that dyno chart?
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Old 06-04-2004, 08:26 PM   #25
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Please don't take me wrong, I'm not downing his set-up. I just hope mine does that well.
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Old 06-04-2004, 10:49 PM   #26
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Ive been reading the comments on this thread for a week now debating if I was going to post or not.

For this setup the combo is perfect. 14,000 people may run this combo but I bet 3/4 of those people are happy.

Gives me evil thoughts of a 300+ hp vortec headed hot cam 305.
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Old 06-05-2004, 01:29 PM   #27
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Quote:
Originally posted by todd200
Please don't take me wrong, I'm not downing his set-up. I just hope mine does that well.

i in no way was downing his combo nor trying to "one-up" him..ANY car/combo that will run low 12's has my attention...the vortec heads are a REAL bang for the bucks thats without a doubt....you said youd be faster with a 274 and i chimed in and said that i know people with a simialr setup with that cam (274) who put down those numbers that i posted...kinda like an FYI...
theres one guy in particular whos running that 224-230 cam with stock LT1 heads which dont flow as much as vortecs, shorty headers who put down 350rwhp....i was going to run a HC becasue i jsut wanted a nice mild street cam....then i saw 20RWHP with the 224-230 and it isnt that much bigger then the HC...

BTW do you have any sound clips?...and what is the LSA on that HC....ive heard a HC on a carbed motor before with a 106 LSA...and the idle is VERY choppy...sounds like a 306 (236/242?)...


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Old 06-05-2004, 04:18 PM   #28
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GASGZLER

Hey with your setup and running a little rich in the secondaries you should try and step up to a 650cfm carb. Im sure the motor would respond with a little more cfm flowing through and that might eliminate the running rich in the secondaries. Scoggin Dickeys sells demon carbs already setup for guys with your combo. They have a 650 setup for the ZZ4 crate motor and your motor pretty much has the same specs. Anyways just throwing some ideas at ya! Good luck.
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Old 06-05-2004, 08:37 PM   #29
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I choose the Hot Cam set-up on the advice of a friend. He has a 92 Vette with the Hot Cam kit, CNC LT1 heads, Hooker long tubes and his own custom prom and put down 392rwhp and 355rwtq. After driving his car once and feeling how docile it was as long as you stayed out of it I felt it was a good choice. BTW, he also gets 26 mpg highway. Now my heads don't flow as well as my friends, and probably not as well as GASGZLR's but seeing his power makes my goal of 320-330 rwhp seem do-able with the proper tuning.
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Old 06-06-2004, 02:25 PM   #30
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Quote:
Originally posted by OMINOUS_87
Anyway though, I asked earlier and got no response, what was the correction factor used in that dyno chart?
I am not too sure but I think it might be SAE. I got it dynoed at 5400 feet elevation in a hot warehouse on a 100 degree day.

My engine is roughly tuned and if I had stand alone EFI I and ported heads, I am sure it would make up to 40 more hp. Torque is what I wanted on the cheap.
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