Ol 383 back on the rollers. - LS1TECH - Camaro and Firebird Forum Discussion

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Ol 383 back on the rollers.

Old 11-03-2018, 05:35 PM
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Default Ol 383 back on the rollers.

Hey everyone.

Had the car on the dyno today for some pulls. Planning on three pulls but time was tight. Only got two. Wanted to get graphs in sae & std just for fun. But again not much time. Also the graph is on a odd power scale than normal so it looks a bit rough. No matter really. Glad to finally see the big 500+ even though std. Also the tq spike on second run. Max tq was probably 459ft-lbs. Still running strong.

01 Camaro SS M6

- TSP 383 - GM 5.3L Block
- TSP Forged 4340 LSx 4.00" Crankshaft
- TSP 6.125" Super H-Beam Connecting rods w/ ARP 2000 bolts
- Wiseco -3cc flat tops (11.5:1)ish
- Melling oil pump
- Comp Cams hi tech roller timing chain set-adj.
- Morel 5315 lifters
- Harland Sharp 1.7 roller rockers
- Custom cam spec'd by Martin 235/239 116+2 .637"/.620".
- PRC 215cc CNC ported cylinder heads 62cc/BTR .660" Platinum springs, Titanium retainers
- Racetronix 37lb fuel injectors
- Racetronix fuel pump & hot wire kit
- Fast 92 intake manifold- Mamo ported
- NW 92 T.B.
- Kooks 2" primary 3" collectors.
- TSP Rumbler bullet TD's
- ARP crank bolt
- ARP cylinder head bolts
- Z06 MAF (90mm)
- FTP 98 lid
- K&N filter
- Granatelli wires
- GZ vacuum pump (Sportsman)
- ATI Super Damper 7.53"
Attached Thumbnails Ol 383 back on the rollers.-img_8985.bmp  
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Old 11-03-2018, 09:05 PM
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Not bad numbers! That cam is tiny for your set up, as is the fast 92. Good on you for going with 2in headers though!
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Old 11-03-2018, 09:41 PM
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Pretty good numbers for that build
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Old 11-04-2018, 01:14 AM
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Good numbers there. Should be fun. The dyno operator can switch your correction to SAE on that run to see the difference.
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Old 11-04-2018, 03:40 PM
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Power falls off like a rock after peak.

VT is either needing some work or the combo is just mismatched. No reason for power to drop like that.
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Old 11-04-2018, 03:46 PM
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Bet an MSD intake intake would help above 6500 rpm
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Old 11-05-2018, 09:54 AM
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I 2nd valvetrain concerns as its really jagged even with a smoothing on 5. How many miles on the springs?
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Old 11-05-2018, 12:23 PM
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Thanks for the comments guys. Next time I'm at shop I'll mess with the files, get them on the right scale, & check other CF.


Originally Posted by T.Man View Post
Power falls off like a rock after peak.

VT is either needing some work or the combo is just mismatched. No reason for power to drop like that.
To me it's not too terrible. I've seen worse. The combo was put together to make peak power at or before 6500rpm. As say the 23x cam with only 5* of overlap. It carries ok to about 6800 rpm only dropping about 10hp from peak. Then it is on a down hill. But we know that's usually the case with a long runner fast.

Originally Posted by wannafbody View Post
Bet an MSD intake intake would help above 6500 rpm
I agree.

Originally Posted by ddnspider View Post
I 2nd valvetrain concerns as its really jagged even with a smoothing on 5. How many miles on the springs?
Yea, it does look pretty rough. I think maily due to the scaling on graph as eack box is only 20hp as normally it's 50hp. Lol. Makes it look better. I'll post my run last year just to compare. Actually just a tick past 10k miles on the BTR springs. The cam has pretty easy lobes & springs should last to around 30k miles. I'll probably change them out around 25k if no issues.
Attached Thumbnails Ol 383 back on the rollers.-img_7881.bmp  

Last edited by SoFla01SSLookinstok; 11-05-2018 at 12:31 PM.
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Old 11-05-2018, 12:33 PM
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Originally Posted by SoFla01SSLookinstok View Post
Thanks for the comments guys. Next time I'm at shop I'll mess with the files, get them on the right scale, & check other CF.




To me it's not too terrible. I've seen worse. The combo was put together to make peak power at or before 6500rpm. As say the 230 cam with only 5* of overlap. It carries ok to about 6800 rpm only dropping about 10hp from peak. Then it is on a down hill. But we know that's usually the case with a long runner fast.



I agree.



Yea, it does look pretty rough. I think maily due to the scaling on graph as eack box is only 20hp as normally it's 50hp. Lol. Makes it look better. I'll post my run last year just to compare. Actually just a tick past 10k miles on the BTR springs. The cam has pretty easy lobes & springs should last to around 30k miles. I'll probably change them out around 25k if no issues.
Hmmm, to me even that last graph looks more wavey than expected, especially with easy lobes. It just looks like something isn't happy starting around 4500 and gets worse the higher its revved. Obviously good numbers, especially with the small cam, just wonder if there's more power to be had with a happier valvetrain. Don't see many 383's on here make over 500whp, except for like Tony M. etc.
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Old 11-05-2018, 12:54 PM
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Originally Posted by ddnspider View Post
Hmmm, to me even that last graph looks more wavey than expected, especially with easy lobes. It just looks like something isn't happy starting around 4500 and gets worse the higher its revved. Obviously good numbers, especially with the small cam, just wonder if there's more power to be had with a happier valvetrain. Don't see many 383's on here make over 500whp, except for like Tony M. etc.
True. It does only have 5/16 .080" wall push rods & heavy SS valves. Could be better with say thicker pushrods & lighter valves. Maybe it's where the intake starts to pull a vacuum & it wants more air? It really doesn't bother me too much as, I wont say all, most graphs have a wave to them up top. Say the BBF ford that was on there after me. His graph was long & straight, around 800rwhp, but it did have waves. Also a SBF revving to 8k+. Power carried all the way out but it also had waves. It's not the best setup but it does ok. Thank you for compliments sir.
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Old 11-05-2018, 01:37 PM
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I would think that only with the most bullet-proof and rigid valvetrain, with the lightest valves possible, would there be no or few hiccups in the graph.
I will also say that the later graph looks a good bit smoother than the previous one. Improvement is GOOD...…
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Old 11-08-2018, 02:13 AM
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The entire top end is out of breath. Not trying to be a dick but put that top end on a 5.3 and it’ll make similar HP. Some larger runner heads like GMPP ls6 heads with a ported MSD or small bore ls3’s with a mid runner fast will give similar tq but a lot more hp and carry significantly better and go faster. It’s a clean car and I’m sure a fun setup but imo a 383 should be making more like 550 rwhp these days

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Old 11-08-2018, 02:16 AM
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Originally Posted by G Atsma View Post
I would think that only with the most bullet-proof and rigid valvetrain, with the lightest valves possible, would there be no or few hiccups in the graph.
I will also say that the later graph looks a good bit smoother than the previous one. Improvement is GOOD...Ö
i can try to post mine tomorrow... Cam Motion LLSR with DarthV8r horsecock cam specs, is smooth as glass. At 8000 it sounds like a Stock Ls at 5900
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Old 11-08-2018, 08:04 AM
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There's more room in those heads, they flow 318cfms @ 600, so thats not choking out and no a 5.3 with that cam and heads won't make 500whp.
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Old 11-08-2018, 10:00 AM
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Originally Posted by ddnspider View Post
There's more room in those heads, they flow 318cfms @ 600, so thats not choking out and no a 5.3 with that cam and heads won't make 500whp.
cfm isnít everything and I said similar power.
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Old 11-08-2018, 10:14 AM
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Originally Posted by big hammer View Post


cfm isnít everything and I said similar power.
I agree CFM isn't everything, but that's not the weak link here. What do you consider similar?
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Old 11-08-2018, 10:22 AM
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Those are good numbers. I don't see anything wrong other then the Dyno graph is not scaled properly...zoomed in too far.
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Old 11-08-2018, 10:34 AM
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Originally Posted by ddnspider View Post
I agree CFM isn't everything, but that's not the weak link here. What do you consider similar?
heads and intake are the weak link. Iíd want at least a 235-240cc runner and a well ported MSD on that engine
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Old 11-08-2018, 10:41 AM
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Originally Posted by big hammer View Post


heads and intake are the weak link. Iíd want at least a 235-240cc runner and a well ported MSD on that engine
Sure, for max effort, but the 215's aren't choking that setup. Still waiting on what 5.3 of similar power means...
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Old 11-08-2018, 11:03 AM
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Originally Posted by big hammer View Post
The entire top end is out of breath. Not trying to be a dick but put that top end on a 5.3 and it’ll make similar HP. Some larger runner heads like GMPP ls6 heads with a ported MSD or small bore ls3’s with a mid runner fast will give similar tq but a lot more hp and carry significantly better and go faster. It’s a clean car and I’m sure a fun setup but imo a 383 should be making more like 550 rwhp these days


I can agree with this. Past around 6500 rpm though. It's ok you can post your opinion. These heads are only 215cc but are great heads. The best heads? No of coarse not. We've seen tests against the MSD on cath heads. The fast manifolds make better tq/hp up to about 6500rpm. Also the highest I spin is about 7200 & that's only racing or dyno. With the shift drop about 2k rpm I'm just above 5k on an up shift. It would be cool to see the average hp numbers between my manifold & a msd between these rpm. Hams just think if I put some llsr big cam in it with a msd & spun it to 7500+. I bet it would make a nice amount more power with same heads. Ls3 heads would make more power up top but I'm just not a fan. Try to remember this is a skreet car.

No hams a 5.3 will not make this power in this rpm range. Now a 8-9k rpm screamer. Sure. The piston is a nice bit smaller. Hey I could be wrong. I also would like to see a 5.3 making similar power.
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