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Street 360/408 dyno results (520 CHP - 540 CTQ) #39703
05/17/07 10:53 PM 05/17/07 10:53 PM
Joined: Feb 2003
Posts: 752
North Dakota
J
Jesse_Lackman Offline OP
super gas
Jesse_Lackman  Offline OP
super gas
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Joined: Feb 2003
Posts: 752
North Dakota
408 based on Magnum block

-RHS 360HPST iron heads, 2.02/1.60

-Hughes 236/242 @ .050 Hyd roller .557/.521 lift

-stock Magnum hydraulic lifters

-Dove/Racer brown rockers 1.6 intake 1.5 exhaust

-Performer RPM Air Gap

-Holley 870 Street Avenger

-1 5/8 x 2 3/4 dyno headers

-91 octane pump gas

-12.5 manifold vacuum @ 950 RPM

-398 CTQ @ 2000 RPM

-542 CTQ peak @ 4300 RPM

-520 CHP peak @ 5900 RPM

-500 CTQ from 3200 to 5200 RPM

No time to try any tricks, would have made more upper RPM HP with an open spacer but customer did not have the room to use one.

Last edited by Jesse_Lackman; 05/21/07 04:38 PM.
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39704
05/17/07 11:12 PM 05/17/07 11:12 PM
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
H
HotRodDave Offline
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HotRodDave  Offline
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Kalispell Mt.
Thats great for iron heads.
What was done to those heads?

I am not causing global warming, I am just trying to hold off a impending Ice Age!
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: HotRodDave] #39705
05/18/07 12:39 AM 05/18/07 12:39 AM

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Yea i would like to know what was done with the heads! Thats basically my combo in a nutshell, and i am running unported irons....i expect way less from my build!
Re: Street 360/408 dyno results (RHS 360-HPST heads) #39706
05/18/07 09:21 AM 05/18/07 09:21 AM
Joined: Feb 2003
Posts: 752
North Dakota
J
Jesse_Lackman Offline OP
super gas
Jesse_Lackman  Offline OP
super gas
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Joined: Feb 2003
Posts: 752
North Dakota
Blending to valve job, guide work, (they don't need much though), and opening up the pushrod pinch.

The heads are a big part of the package.

Lot of thought and planning into this one and it paid off.

In case it comes up my dyno doesn't seem to be an overly optimistic one and has been cross checked three ways; jet boat pumps, it takes X hp to turn a certain pump X RPM - it was right on; quarter mile track time HP pretty much equal to dyno; and the 2003 Moparts EM engine results very close to mine.

I'll probably hear track times for this engine later this summer.

Jesse Lackman RevSearch Amsoil Products FBO Dealer - some parts available online FBO Systems home page
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39707
05/18/07 09:24 AM 05/18/07 09:24 AM
Joined: Aug 2003
Posts: 11,179
Atco NJ
DJVCuda Offline
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Atco NJ
thats alot of power down low!

nice!!
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39708
05/18/07 09:32 AM 05/18/07 09:32 AM
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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HotRodDave Offline
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Kalispell Mt.
What was the compression ratio?

I am not causing global warming, I am just trying to hold off a impending Ice Age!
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: HotRodDave] #39709
05/18/07 09:35 AM 05/18/07 09:35 AM
Joined: Feb 2003
Posts: 752
North Dakota
J
Jesse_Lackman Offline OP
super gas
Jesse_Lackman  Offline OP
super gas
J

Joined: Feb 2003
Posts: 752
North Dakota
10.8 CR

Actually made slightly more power on 91 pump than 100LL

Total timing = 35

Jesse Lackman RevSearch Amsoil Products FBO Dealer - some parts available online FBO Systems home page
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39710
05/18/07 09:48 AM 05/18/07 09:48 AM
Joined: Jan 2003
Posts: 5,484
SoCal
Brian Hafliger Offline
master
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Posts: 5,484
SoCal
Quote:

Blending to valve job, guide work, (they don't need much though), and opening up the pushrod pinch.

The heads are a big part of the package.

Lot of thought and planning into this one and it paid off.

In case it comes up my dyno doesn't seem to be an overly optimistic one and has been cross checked three ways; jet boat pumps, it takes X hp to turn a certain pump X RPM - it was right on; quarter mile track time HP pretty much equal to dyno; and the 2003 Moparts EM engine results very close to mine.

I'll probably hear track times for this engine later this summer.



Yeah, hopefully someone doesn't try to ruin this thread with the "your dyno must be Happy" scenario.
Great power, gotta love those iron heads

Brian Hafliger
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39711
05/18/07 10:34 AM 05/18/07 10:34 AM
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
B
BradH Offline
Taking time off to work on my car
BradH  Offline
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Posts: 15,439
Val-haul-ass... eventually
Gotta love those results...

Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: BradH] #39712
05/18/07 02:19 PM 05/18/07 02:19 PM
Joined: Jan 2003
Posts: 945
La Vernia, Texas
Pat7272 Offline
super stock
Pat7272  Offline
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La Vernia, Texas
Do you have flow numbers for those heads?
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Pat7272] #39713
05/18/07 04:13 PM 05/18/07 04:13 PM
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick Offline
I Live Here
patrick  Offline
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Posts: 16,123
Grand Haven, MI
nice. are the RHS heads still available? how do they compare with the enginequest ones (which I see all over the place compared to the RHS's).

how much do you think a hydro roller cam with ~8 degrees less duration would do for power, torque, & idle? I'd like to build something similar, but I'd like ~ 16" vacuum at a 900-950 idle.

1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: patrick] #39714
05/18/07 05:19 PM 05/18/07 05:19 PM
Joined: Feb 2003
Posts: 752
North Dakota
J
Jesse_Lackman Offline OP
super gas
Jesse_Lackman  Offline OP
super gas
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Joined: Feb 2003
Posts: 752
North Dakota
8 degrees less cam would likely take 25 peak HP but the torque peak might stay close to the same.

- No flow numbers on the heads.

Jesse Lackman RevSearch Amsoil Products FBO Dealer - some parts available online FBO Systems home page
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39715
05/18/07 08:32 PM 05/18/07 08:32 PM
Joined: Jan 2003
Posts: 945
La Vernia, Texas
Pat7272 Offline
super stock
Pat7272  Offline
super stock

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Posts: 945
La Vernia, Texas
how do these heads compare to the Edelbrocks?
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39716
05/19/07 07:20 AM 05/19/07 07:20 AM
Joined: Jul 2003
Posts: 165
Johnstown ohio
BluCuda Offline
member
BluCuda  Offline
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Posts: 165
Johnstown ohio
Hi Jesse- Good job! Sounds like a nice street/strip engine. What was the cams lobe center angle and what intake centerline did you install it at?
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: BluCuda] #39717
05/19/07 12:31 PM 05/19/07 12:31 PM
Joined: Feb 2003
Posts: 752
North Dakota
J
Jesse_Lackman Offline OP
super gas
Jesse_Lackman  Offline OP
super gas
J

Joined: Feb 2003
Posts: 752
North Dakota
Haven't run the RHS/ProTopline 360-HPST back to back against Edlbrocks.

Cam 112 LSA installed at 110.


Jesse Lackman RevSearch Amsoil Products FBO Dealer - some parts available online FBO Systems home page
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39718
05/19/07 03:17 PM 05/19/07 03:17 PM
Joined: Jan 2003
Posts: 945
La Vernia, Texas
Pat7272 Offline
super stock
Pat7272  Offline
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Posts: 945
La Vernia, Texas
Are those heads factory pieces that have been reworked or brand new castings?
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39719
05/19/07 04:40 PM 05/19/07 04:40 PM

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I have a pair of these RHS (cast iron) Magnum heads new on the shelf. In case anyboby is interested.

Andy
305-608-2565 Cel.
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39720
05/19/07 05:37 PM 05/19/07 05:37 PM
Joined: Nov 2003
Posts: 2,503
Illinois
CRE2004 Offline
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Illinois
Nice job Jesse

Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Pat7272] #39721
05/21/07 12:14 AM 05/21/07 12:14 AM
Joined: Feb 2003
Posts: 752
North Dakota
J
Jesse_Lackman Offline OP
super gas
Jesse_Lackman  Offline OP
super gas
J

Joined: Feb 2003
Posts: 752
North Dakota
Quote:

Are those heads factory pieces that have been reworked or brand new castings?



Brand new castings They have been out for a while though.

Jesse Lackman RevSearch Amsoil Products FBO Dealer - some parts available online FBO Systems home page
Re: Street 360/408 dyno results (RHS 360-HPST heads) [Re: Jesse_Lackman] #39722
05/21/07 08:32 AM 05/21/07 08:32 AM
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick Offline
I Live Here
patrick  Offline
I Live Here

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Posts: 16,123
Grand Haven, MI
most promising thing is the amount of lift/ramp angle and RPM the stock lifters were able to handle

1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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