CalSpeedPerformance

iTrader: (64)

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 5200 8" converter
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:

skeet

iTrader: (18)

those stage 3"s are gonna make a world of difference, deffinitely need to stick a 102MM on there and get a bigger CAI tube nothing smaller than a 5" tube, should be well over 500 , i found out my 4" was a restriction!

JoeyGC5

iTrader: (24)

I wonder if I could fit the Holley on my Vette to use instead of the ported L92 I've been using for over 4 years

ShredSled

iTrader: (11)

wow, nice gains.

I wish they made a version for cathedral port heads.

I highly doubt that would fit in a c5!

TIM Z

iTrader: (12)

Thanks for sharing the info, very cool!!

More pics of the Nova!!! It looks baddass .

TexasGMC08

Thanks for the dyno results! It seems your paying more for the look! most are not going to be raping up to 6800.

low2001gmc

iTrader: (137)

bigger cubes with such heads require such intake but i wonder how that intake would do on a built smaller 6.0 with exhaust ported only rectangular port heads????