Precision Race Components LS7 Cylinder Head Engine Dyno Results!! - LS1TECH

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Precision Race Components LS7 Cylinder Head Engine Dyno Results!!

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Old 12-05-2007, 12:10 PM   #1
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Default Precision Race Components LS7 Cylinder Head Engine Dyno Results!!

We've finally got the opportunity to get the all new PRC CNC Ported LS-7 cylinder head installed on our dyno test LSx 454 engine! The engine was dyno tested with Texas Speed 254/260 camshaft, LS7 intake, Texas Speed all new 100mm MAF & 1 7/8" dyno headers!

Engine Dyno Video:
https://www.texasquadperformance.com/lsx454.mpg

Testing was done with both cylinder heads using the same valves & set to 70cc chambers.

Dyno test with stock GM cnc ported LS7 cylinder heads:

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Dyno test with Precision Race Components CNC Ported LS7 Cylinder Heads:

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Pic of the 454 on the engine dyno

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Click the image to open in full size.

30 Peak Horsepower Gains & 16 lb ft of torque!!
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Old 12-05-2007, 12:18 PM   #2
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Damm, thats a beast, ****
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Old 12-05-2007, 12:40 PM   #3
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about 615 or so at the tire I woudl guess! Did this have any "dyno tricks", like ewp (I assume not). Would there be any real power difference between this motor and a LS7 based 440 stroker? Is there any benefit to going with a bigger cam while using the LS7 intake?

What would the total price be for a complete engine (intake, TB, injectors, etc) using a LSx iron block or a LS7 440 stroker?

720 crank hp on a daily driver in a F body or vette would be nice. Probably get decent mileage too!

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Old 12-05-2007, 01:03 PM   #4
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))what's Compression On That Motor And Is That On Pump Gas!!
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Old 12-05-2007, 01:44 PM   #5
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More info on 100mm MAF, please.
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Old 12-05-2007, 04:26 PM   #6
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The Link doesn't work! =*(
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Old 12-05-2007, 05:31 PM   #7
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more info on the 100 ml maf and is the cam shaft a hyro or soild-

a nice gain

whats the price on the cyc heads complete cnc and ready to go jason?

thanks in advance-
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Old 12-05-2007, 07:41 PM   #8
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Jason.....are you going to have any exchange program of any kind with people that have LS7 heads already? I'm very interested in your heads but I'm kind've stuck because I have good heads, springs, and valves already. Traver
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Old 12-05-2007, 10:45 PM   #9
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nevermind....I see it now

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Old 12-05-2007, 11:26 PM   #10
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NICE, now just drop a ported LS7 intake, and lets see how much the stock LS7 intake is holding that baby back!
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Old 12-06-2007, 05:57 AM   #11
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Damn that is a sick set up and awesome numbers .

Great work TSP Like always.
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Old 12-06-2007, 10:10 AM   #12
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))hey Jason Or You Going To Answer Any Of These Post!!! Please!!
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Old 12-06-2007, 03:16 PM   #13
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Jason and most of the TSP guys are at the PRI show in Orlando, FL. I'll answer a few quick questions before I leave for the weekend myself, but unless Jason finds an internet connection, I wouldn't expect a response until late Sunday or Monday morning.

We ended up not using that Vacuum pump in the picture with our heads as it only made 3-4hp pulling 15 inches of vacuum on the crankcase, wasn't worth the hassle and belts were hard to keep in place. You can tell the vacuum pump was on the stock heads by looking at oil pressure, the more vacuum on the crankcase, the lower the indicated oil pressure. We were kinda surprised it didn't pick up more with the pump actually. May be a testament to how well the LSX block cylinders seal and the crankcase breathes!

All pulls were with a ported LS7 intake (look at the dyno notes in the sheet). We had swapped to that earlier on during the testing, but well before swapping heads. I don't remember exactly what the ported intake picked up (we were 3 days on the dyno) but I know it was around 8-9hp. The 100mm MAF picked up a little more than that by itself once tuned, that will likely have its own post.

The engine dyno facility we use only had 113 and 116 octane fuels, we used the 113 for all pulls. The static compression should be around 11.8-1 from what Jason said.

These were also not the final numbers (we tested quite a few setups), I'll let Jason post them up when he gets back. It was enough to not bother swapping to our biggest cam we took...

These graphes were the Cylinder Head swap alone, we probably made 20-25 pulls when we were finally finished with the other tests.
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Old 12-06-2007, 06:16 PM   #14
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Thanks, man . Good info.
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Old 12-07-2007, 02:36 PM   #15
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impressive!! will be looking forward to seeing info on the rest of your testing
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Old 12-07-2007, 03:30 PM   #16
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Why use such high octane fuel for 11.8:1? How much timing are you guys running and is that some super high DCR cam?
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Old 12-07-2007, 08:39 PM   #17
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No dyno tricks...just no power steering, no air lid or air filter, EWP, underdrive pulley, no altenator so no need for a serpentine belt, 1 7/8" "dyno headers" which wouldnt fit an F-body or a corvette and are symmetrical for even flow...no dyno tricks at all!!! I wanna see this setup in a running, driveable vehicle, on a chassis dyno, with all enigine components hooked up and working, and with a serpentine belt, air lid, filter, etc. like it would actually be in someone's car...make good numbers then and I'll be impressed, as long as the numbers from TSP's chassis dyno equate to other comparable dynos, and are not "inflated".
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Old 12-08-2007, 03:21 AM   #18
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What!!!! I didnt know you cant install 1 7/8 headers on F-BODY????
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Old 12-08-2007, 06:56 AM   #19
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I didnt mean b/c of the size of the primaries people...b/c of the shape of the primaries and how they run...how many sets of long tubes for f-bodies and corvettes are identical on each side and can stick out that far from the block and not hit something else in the engine compartment...Jesus Christ guys...I am not a complete dumbass!! Just mostly a dumbass...HAHAHA! Those headers will outflow and and outperform any aftermarket LS-style header on the market b/c of how they are designed! Really, I just wanted to light a fire under their *** to get this motor in a car and give us some real world numbers! i am interested to see what kind of RWHP this setup can produce!!
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Last edited by moeZ28; 12-08-2007 at 08:54 AM. Reason: Add more info
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Old 12-08-2007, 07:41 AM   #20
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Am I the only one that looks at this as they only gained 27hp and 5-20 ft/lbs of torque through out the rpm band over stock heads? That tells me that the factory ls7 heads are pretty badass from the factory. And those gains might not be as large once the motor gets bolted up in a car with real world accesories and exhaust / intake.

Again, I'm not knocking, just amazed at how well the factory heads work with the larger cam and all of the intake/exhaust work.
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