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Description
LS Hi-Ram EFI Manifold - Black GM LS1/LS2/LS6 - 105MM Throttle BodyHolley LS Hi Ram EFI Manifold Black GM LS1 LS2 LS6 LS1 LS2 LS6 Cathedral Port EFI for 1 x 105MM Throttle Body Overview The Holley GM LS1 LS2 LS6 Modular Hi Ram Intake Manifold is introduced as a cost effective alternative to fabricated sheet metal for high performance applications where induction system height is not limited. Coupling this Hi Ram intake with the high flowing LS1 LS2 LS6 style cylinder heads has outstanding potential for N A and forced
Holley LS Hi-Ram EFI Manifold - Black GM LS1/LS2/LS6LS1/LS2/LS6 Cathedral Port EFI for 1 x 105MM Throttle Body
Overview
The Holley GM LS1/LS2/LS6 Modular Hi-Ram Intake Manifold is introduced as a cost effective alternative to fabricated sheet-metal for high-performance applications where induction system height is not limited. Coupling this Hi-Ram intake with the high flowing LS1/LS2/LS6 style cylinder heads has outstanding potential for N/A and forced induction applications at a budget-minded cost. Aggressive, bold, race-bred styling will make bad intentions clear for drag race, muscle car, marine, off-road, sandrails, pulling trucks, track, street-rod applications and more! The base is designed to be modular in configuration to accept a wide range of carbureted and EFI tops and to be attractive to builders and fabricators as the foundation for custom induction systems. Runner length and the tapered cross-section designed to perform well for a wide range of engine configurations EFI fuel rails are machined for -8AN O-ring Fittings with passages large enough to accommodate high fuel flows and dampen pressure pulsations in the fuel system and come standard with EFI Hi-Ram kits. Cast aluminum construction. Intended for use on N/A or forced induction engines in the 6.0 to 7.0+ liter range, max power at 7000-8000+RPM.
*** The front and rear height measurements listed in the Specs section are referencing the overall height with the top plate installed. Please see the diagrams in the product images for other dimensions.
Features:
- Base Plenum Top Mounting Flange Height ???? 8.42??? to the lifter valley cover flange on engine block.
- Total Height with 92/105mm EFI Plenum Top ???? 12.32??? to the lifter valley cover flange on engine block.
- Runner Length ???? 6.58???, As-Cast Runner Cross-Sectional Area ???? Tapered 4.25 in?? to 2.53 in??
- Throttle Body Flange Location, with 102mm EFI Plenum Top : Height ???? 8.42??? (from engine block lifter valley cover flange), Longitudinal Location ???? 3.84??? (forward from engine block front flange), Angle ???? 25 deg. (down from vertical)
- Plenum Top Gasket Type ???? 3/32??? Round O-ring Cord
- Mounting Flange Gasket Type ???? Standard LS3 Molded O-Ring
- Port Size ???? 2.49??? Height x 1.21??? Wide
Details:
- Color: Black
- Construction: Cast
- Engine: GM LS1/LS2/LS6
- Finish: Black
- Front Height: 12.32 inch
- Fuel System Type: EFI
- Manifold Type: Hi-Ram
- Rear Height: 11.00 inch
- Recommended Use: Forced Induction
- RPM Power Band: 3500-8000 RPM
- Warranty: Limited 90 Day
Links
300-123
Instruction Sheet
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.9 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
Great sock for everyday
Size: Large, Color: Black/Gray (6 Pairs)
So these are awesome but they are slightly thinner than older versions, shorter too. Just FYI if you a long time UA customer.
If you have never had their socks, I love them personally and only like one other brand better. They aren’t overly thick and they allow your feet to breath. I never have sweaty feet in these even in my warm boots. I also like that they don’t cut into my feet or get holes in the toes over long terms. The only reason I’ve thrown these out has been fraying near the ankle or someone (kids) thieving them.
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Reviewed in the United States on December 28, 2019
★★★★★ 5
LOVE THEM!!
Size: Small, Color: (001) Black / Black / Castlerock
LOVE! These socks are so comfortable! I wear a 5 in women's and a 3 in big kid shoes. The small fit me perfectly. I see where some say they run small but I can't say that was an issue for me. They are "snug" but thats what you want with a no show sock. I feel they have support vs the ones i used to buy at Walmart. They are very soft! I am actually buying more today and throwing my other ones in the trash!
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Reviewed in the United States on February 18, 2026
★★★★★ 5
So will not write down your foot
Size: Medium, Color: (001) Black / Black / Castlerock
I love these socks. They have a little bit of gel on the top of the heel for support in your tennis shoes and so your socks don’t write down. Very good quality.
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Comfy and Stay Put
Size: Medium, Color: (002) Black / Black / Halo Gray
These socks are honestly great. They’re super thin and light, so once you have them on, you kind of forget they’re even there. No bulky feeling in your shoes at all.
The best part is they actually stay on. I hate no-show socks that slide down after five minutes, and these don’t do that. The little grip on the heel really works, so you’re not constantly adjusting them all day.
They’re breathable too, which is nice if your feet run warm. They dry fast and don’t get that gross sweaty feeling. And there’s no annoying seam on the toe, so nothing rubs or feels uncomfortable.
Basically, they’re just comfy, stay put, and don’t cause problems — which is all I want from socks.
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Reviewed in the United States on January 16, 2026
★★★★★ 5
Perfect sucks
Size: Medium, Color: (001) Black / Black / Castlerock
Wonderful socks . The weight is perfect !! These do not slip when in a shoe they stay out !!
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Reviewed in the United States on April 14, 2026