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:

 

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!

 

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

 

wow, nice gains.

I wish they made a version for cathedral port heads.

I highly doubt that would fit in a c5!

 

Thanks for sharing the info, very cool!!

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

 

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

 

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????