Tested Holley Hi-Ram LS3 intake vs Stock LS3, 45 rwhp gain on stock LS3 heads - LS1TECH

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Tested Holley Hi-Ram LS3 intake vs Stock LS3, 45 rwhp gain on stock LS3 heads

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Old 11-21-2011, 04:27 PM   #1
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Default Tested Holley Hi-Ram LS3 intake vs Stock LS3, 45 rwhp gain on stock LS3 heads

We have been very happy with these Holley Hi-Ram intake manifolds so far in our testing.


Vehicle/Combo:
1962 Nova LSx conversion -


408" Stroker, Stock LS3 cylinder heads, 11.25:1 compression
247/259, .624/.624 @ 114 LSA LSL/LSR lobe camshaft
CalSpeed custom built 2" Primary headers /w 3.5" Collectors, open headers
Powerglide /w 5600 rpmm stall 8" converter (Goes 5200 on transbrake with both intakes)
Tubbed 9" Rear-end /w 33" x 14" slicks

Tested with factory LS3 Intake manifold /w Edelbrock 90mm throttle body
Peak power @ 6000 rpm - 460 rwhp (Power fell to 420 rwhp by 6800 rpm and much worse above that on other pulls)


Swapped to Holley Hi-Ram intake with same throttle body 90mm
Peak power @ 6300 rpm - 480 rwhp BUT held powerband to 465 rwhp @ 6800

Right at 45 rwhp more at 6800 rpm and we plan to shift the car 6800-7000 at the track so hoping for 3-4 tenths at the track vs LS3 intake.


We are going to be testing again on the same comparison / combination with a set of Stg 3 CNC WCCH heads in a GTO /w lockup 4l60e trans next month. Results will be posted when available.

Dyno sheet:





Last edited by CalSpeedPerformance; 11-21-2011 at 07:22 PM.
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Old 11-21-2011, 04:30 PM   #2
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Wow, thats pretty impressive, great results.

Looks like there was no measurable loss down low on this application too...any feedback on drivability?
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Old 11-21-2011, 04:37 PM   #3
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Cool test, Jim! Did you make any pulls that show the low RPM stuff (under 5K rpm)? I'd be eager to see those number as much or more than those peak numbers!
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Old 11-21-2011, 06:59 PM   #4
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Check the stall, I don't think he can get lower rpm numbers.
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Old 11-21-2011, 07:03 PM   #5
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Darn good numbers taking the high stall torque converter into consideration.
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Old 11-21-2011, 07:22 PM   #6
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Car flashes to what you see in the graph (non-lockup 5600 stall on the transbrake), no way of making pulls at lower RPM etc.

Next car we test on, we will lock converter and pull from about 2500 rpm up.
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Old 11-21-2011, 09:25 PM   #7
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So would this be beneficial for people Ohh say a g8 with the l76 with a mid sized cam and head work? With supporting mods of course.

Or is this really for people with bigger cubes and top end cars?
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Old 11-21-2011, 09:41 PM   #8
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How tall is this intake compared to the truck intakes? Do you have a picture from the side, showing the height of the intake?
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Old 11-21-2011, 11:58 PM   #9
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I'm curious as to what et the car runs as is? I'm thinking about doing a 408 for my 64 nova@ 2600 rw
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Old 11-22-2011, 05:08 AM   #10
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Thank you very much for posting results! Have you guys ever tested the pro flow intake? How does it compare if you have, doesn't seem anyone has posted back to back results.
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Old 11-22-2011, 08:51 AM   #11
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looks like theres no chance of this fitting under any car that came stock with a ls3 or even ls1 for that matter LOL

would love to put one under my ws6 trans am
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Old 11-22-2011, 08:42 PM   #12
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To anyone asking questions on whether it would work better for their combination: Until you or someone dynos your exact combo, then its all hypothetical. I wouldnt take anyones word for any guess until its been tested.


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Originally Posted by Nitroused383 View Post
Thank you very much for posting results! Have you guys ever tested the pro flow intake? How does it compare if you have, doesn't seem anyone has posted back to back results.
Pro-flo isnt offered with LS3 based ports as far as i know, so no way to compare the two.
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Old 11-22-2011, 09:23 PM   #13
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Stupid that they don't make this for cathedral port
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Old 11-29-2011, 09:18 PM   #14
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looking forward to more test of this intake, thought it would keep pulling higher in the rpms.
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Old 11-29-2011, 09:40 PM   #15
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What hood do you use? I am ordering one of these for my 443 in the 67 wagon. It has a standard 2" steel cowl hood, so I am curious. I have measured, but would love to hear real feedback.
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Old 11-30-2011, 12:20 AM   #16
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Quote:
Originally Posted by HAHA I 1 View Post
What hood do you use? I am ordering one of these for my 443 in the 67 wagon. It has a standard 2" steel cowl hood, so I am curious. I have measured, but would love to hear real feedback.
Nice collection of chevy II's .
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Old 11-30-2011, 01:01 AM   #17
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I believe this hood would fit with a stock hood. The scoop on it doesnt provide any needed clearance and there is no cowl at the front where the highest point is (above the throttle body)
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Old 11-30-2011, 10:32 AM   #18
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Any word of cathedral port versions eventually?
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Old 11-30-2011, 10:55 AM   #19
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Jim, do you have any feedback on carb'ed version of this manifold?

I bet the blank top machined for a dominator would work just right for my deal...
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Old 12-26-2011, 03:13 PM   #20
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Any new info on this ?
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