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Description
Holley Single Plane EFI Intake - GM LS1/LS2/LS6 - 300-137Overview: Single Plane EFI LS Intake Manifold. All GM LS Gen III or IV engines equipped with LS1 LS2 LS6 style cathedral port cylinder heads. Features: 2500 7000 RPM power band 4150 Square bore flange Optimized runner layout and constant cross sectional area broad torque curve, best vehicle performance from 2500 7000 RPM Minimum carb flange height fit in vehicles with minimum hood modifications Cast aluminum construction great manifold for centrifugal
Overview:
Single Plane EFI LS Intake Manifold. All GM LS Gen III or IV engines equipped with LS1/LS2/LS6 style cathedral port cylinder heads.
Features:
- 2500-7000 RPM power band
- 4150 Square bore flange
- Optimized runner layout and constant cross sectional area - broad torque curve, best vehicle performance from 2500-7000 RPM
- Minimum carb flange height - fit in vehicles with minimum hood modifications
- Cast aluminum construction - great manifold for centrifugal blower, turbocharged or NOS power adder applications
- Efficient casting design - lightweight, consistent wall thicknesses, improved casting quality
- Weight - 11.5 lbs.
- Height (front) - 5.417" to the lifter valley cover flange at the engine block front flange
- Port size - 2.50" height x 1.15" wide
- Includes Viton® O-ring intake to cylinder head gaskets - Viton® is a registered trademark of DuPont Performance Elastomers
- Kit does not work with factory fuel rails and requires the use of Holley Fuel Rail Kit P/N 534-219
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Brand | Holley EFI |
|---|---|
| Construction | Cast |
| Emission Code | 3 |
| Engine | GM Small Block Gen III/IV (LS Based) |
| Finish | Satin |
| Flange Style | 4150 Square Bore |
| Front Height | 5.417 inch |
| Fuel System Type | EFI |
| Manifold Type | Single Plane |
| Product Type | Manifold |
| Rear Height | 5.417 inch |
| RPM Power Band | 2500-7000 |
| Warranty | Limited 90 Day |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
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]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 22 reviews
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Product Reviews
★★★★★ 2
knocked 3 stars off because no shirt pocket
Size: X-Large, Color: Light Grey Vertical Stripe
Two stars because there's no pocket. Shirt is actually nice otherwise but I was so focused on finding shirts with button-down collars (so my Sony WXB400 headphones don't escape) that I didn't notice these didn't have a pocket. I always carry a fountain pen so I need that, also for my phone if I'm not wearing cargo shorts with a "technology" pocket.
If pockets are important to you, this shirt should suffice. Price is right.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 26, 2026
★★★★★ 5
Great purchase
Size: Large, Color: Blue Shark-white
Shirt was the perfect gift for my 21 year old son. The small pattern was perfect and he said that made the shirt cool. The material is comfortable and light enough for warm weather without feeling cheap. Shirt is versatile with the ability to dress up or down.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 9, 2026
★★★★★ 5
Great quality
Size: XX-Large, Color: Grey Blue
Great quality! Very nice color! Fits to size.
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Reviewed in the United States on April 22, 2026
★★★★★ 5
Highly recommend
Is a great product, it fit perfectly, the materials are great.
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Reviewed in the United States on April 7, 2026
★★★★★ 4
Looks great
Size: Large, Color: Black
Looks great, comfortable to wear, love that the buttons are the same color as the shirt, easy to wash, appears to be durably made.
Significantly exceeded expectations (I ordered 2 more).
4 stars instead of 5 because it’s possible to move your arms in a way that makes the shirt slightly tight in the bicep area, but that’s unnoticeable almost all of the time (and minor anyway). Note: even after a couple of wash - wear - wash cycles, there were creases along the same places as where the shirt was shipped; this was easily remedied by a quick iron on a low setting and I think reflects that it is quite resistant to wrinkles.
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Reviewed in the United States on February 26, 2025
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