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Finally after years of waiting I finally got my 5.3 on the dyno.
Stock bottom 2001 LM7
MMS 205 heads with 1.94 intake valves (55 cc chambers)
Mamo Ported Fast 92
Cam spec'd by Tony 214/216 112+4, .595/.596
Yella Terra rockers
Johnson ST2116LSR lifters
Nick Williams 92 TB
Stainless Works 1.75 shorty headers
Performabuilt 4l60E
Circle D 3200 stall
8.2 10 bolt with fresh 3.73 gears
This run is uncorrected. The operator said due to the heat and humidity the correction factor would be 16% higher. It also looks like we need to do some more tuning, not sure what is happening with the dip in the torque curve at 3K.
Last edited by babydeuce; Jun 13, 2021 at 06:27 PM.
Cool build! "Sensible", smaller displacement street builds are not often seen here. Once sorted, it will be strong!
I like how Tony went with a smaller 1.95 intake to reduce shrouding.
Are long tubes possible in your situation? If so you would see gains there. But maybe not in the cards...
How does it idle? I'm betting not stock-smooth, with some mild lope, but still fairly flexible.
Cool build! "Sensible", smaller displacement street builds are not often seen here. Once sorted, it will be strong!
I like how Tony went with a smaller 1.95 intake to reduce shrouding.
Are long tubes possible in your situation? If so you would see gains there. But maybe not in the cards...
How does it idle? I'm betting not stock-smooth, with some mild lope, but still fairly flexible.
Hey G!
Tony's heads are incredible! Long tubes are possible, but at $1400, not sure the dollar to HP ratio is worth it. Idle is very stable with a slight lope. I am very happy with the outcome of the build, it moves the little Chevy II quite nicely.
Very limited on what fits a stock frontend Chevy II with an LS, on top of that I am 3/4" forward of the neutral position.
Since I have you, any thoughts on that dip in the torque curve at 3500, the wideband showed a solid 12.5 afr since it was in PE. Could that be from converter locking up?
Very limited on what fits a stock frontend Chevy II with an LS, on top of that I am 3/4" forward of the neutral position.
Since I have you, any thoughts on that dip in the torque curve at 3500, the wideband showed a solid 12.5 afr since it was in PE. Could that be from converter locking up?
I've actually seen that before on some Scoggin Dickey dyno charts when they were testing truck cams. A dip right around 3500RPM. When I asked about it, they just said it was an anomaly with how the dyno loads. Not sure I totally buy that, but that was their answer. Does it FEEL any different right then? It LOOKS like you would feel a dip like that, but I am no expert on that.
Anyway, enjoy that little beast of yours!
I've actually seen that before on some Scoggin Dickey dyno charts when they were testing truck cams. A dip right around 3500RPM. When I asked about it, they just said it was an anomaly with how the dyno loads. Not sure I totally buy that, but that was their answer. Does it FEEL any different right then? It LOOKS like you would feel a dip like that, but I am no expert on that.
Anyway, enjoy that little beast of yours!
G,
I drove the car quite a bit, and did not feel any type of hesitation or "dip". Maybe it is something with the dyno.
I did not use the CBR plates, my engine was installed years before CBR introduced their LS swap parts. Yes, they are CBR/stainless works mid lengths.
I just got a set of the CBR/Stainless Works@ 1 7/8 primary long tubes for my Chevy II wagon. I compared the included engine plates to my Dirty Dingo DD's that are set 1" forward and my guess is that the CBR plates are 3/4" forward. I can't wait to get my headers and 3" exhaust ran. I was told I left a easy 30 horsepower and ft lb of torque on the table.
Finally after years of waiting I finally got my 5.3 on the dyno.
Stock bottom 2001 LM7
MMS 205 heads with 1.94 intake valves (55 cc chambers)
Mamo Ported Fast 92
Cam spec'd by Tony 214/216 112+4, .595/.596
Yella Terra rockers
Johnson ST2116LSR lifters
Nick Williams 92 TB
Stainless Works 1.75 shorty headers
Performabuilt 4l60E
Circle D 3200 stall
8.2 10 bolt with fresh 3.73 gears
This run is uncorrected. The operator said due to the heat and humidity the correction factor would be 16% higher. It also looks like we need to do some more tuning, not sure what is happening with the dip in the torque curve at 3K.
Nicely done. I'm curious what actually gives that bump in power, I only managed 360awhp using only stock parts, 226/234 cam, double valve springs, 0.039 head gasket, no accessories, on a single plane. Otherwise the power curve looks similar.
Nicely done. I'm curious what actually gives that bump in power, I only managed 360awhp using only stock parts, 226/234 cam, double valve springs, 0.039 head gasket, no accessories, on a single plane. Otherwise the power curve looks similar.
Tony's MMS 205 are a huge improvement over stock heads, plus they were cut down to 55cc for a nice bump in compression.
You double posted. Easy fix, just go to the bottom right of the post, hit "edit" and go from there.
IF I MAY ASK, about how much were the Mamo 205 heads? They, and Tony, impress me....
Thanks, fixed the issue.
I bought these 2 years ago, I am sure pricing has changed quite a bit. With the custom valves, Ti retainers, and the mill work, I gave about 2900. While most will say that is insane, but the Trick Flow GenX205's were coming in around 2400 at the time. I paid for expertise and quality, and I am very happy with both the setup and the service I received from Tony.
I bought these 2 years ago, I am sure pricing has changed quite a bit. With the custom valves, Ti retainers, and the mill work, I gave about 2900. While most will say that is insane, but the Trick Flow GenX205's were coming in around 2400 at the time. I paid for expertise and quality, and I am very happy with both the setup and the service I received from Tony.
Not surprised at all. I think AFR heads are around 2600/pr., and that is a "production" CNC head. Tony is custom work and is paid accordingly. But the results show it!
Thank you!
I laid a 2' Starrett straight edge across the valve tips on my Mamo 223's and they are perfectly even. Zero variation. That makes setting up Johnson limited travel lifters MUCH easier. You're paying for many years of experience and attention to detail (perfection). Tony will email you everyday if needed and talk to you on the phone after business hours as needed.
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Mamo Headed 5.3 
