SKU: 30489236038

6-Bolt LSX Cylinder Heads

$1347.75 $1497.50
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Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Sep 9 - Sep 14

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For Your Every Summer RSVP, with Code: SUMMER15

Description

6-Bolt LSX Cylinder HeadsOverview XtremeCFM 6 bolt LS3 ported cylinder head was designed for maximum power on the LSX platform. Proven to over 1500WHP these heads can be configured with stainless steel or titanium intake valves for optimum performance. Each head comes standard with Inconel exhaust valves and are available with . 660 or . 685 lift springs configurations including titanium retainers. Castings 6 Bolt Head 0. 750 Deck Structure OEM Factory Style Water Crossover

Overview

XtremeCFM 6-bolt LS3 ported cylinder head was designed for maximum power on the LSX platform. Proven to over 1500WHP these heads can be configured with stainless steel or titanium intake valves for optimum performance. Each head comes standard with Inconel exhaust valves and are available with .660” or .685” lift springs configurations including titanium retainers.

Castings

  • 6 Bolt Head
  • 0.750″ Deck Structure
  • OEM/Factory Style Water Crossover Ports
  • 7/16″ Stud Size For Main 10 Bolts
  • 8mm Stud Size For Outer Tabs and Deck Studs
  • A357 T6 Aluminum 
  • 4.000” minimum bore size
  • 273cc equivalent.
  • Aluminum casting performed overseas.

Our Process

  • 5-Axis CNC Ported Intake Ports, Exhaust Ports, and Combustion Chambers
  • Hand Blended and Deburred
  • Final Wash
  • Quality Control at every stage of manufacturing

Options/Upgrades

  • Intake Valve Guides – Bronze
  • Exhaust Valve Guides – Bronze

Parts Included (standard)

  • Intake Valve Seats – Stainless Steel
  • Exhaust Valve Seats – Inconel

Flow Data

NOTE: Flow data recorded @ 28” depression, radius inlet, no pipe on exhaust


Lift

Intake

Exhaust

.100”

79.9

64.4

.150”

116.4

96.7

.200”

161.2

127.2

.250”

205.8

159.1

.300”

249.4

186.4

.350”

287.1

212.7

.400”

317.3

234.0

.450”

345.6

244.8

.500”

361.9

254.2

.550”

375.4

258.5

.600”

391.1

264.6

.650”

402.0

269.7

.700”

407.6

271.9

.750”

410.1

273.3


Metric

Value

Intake Port Volume

266.9cc

Exhaust Port Volume

108.3cc

Chamber Volume

68.2cc

Intake Valve Diameter

2.165”

Exhaust Valve Diameter

1.600”

Install Height

1.790”

Coil Bind Height

1.070”

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 30489236038

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4.6 ★★★★★
Based on 29 reviews
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K
Verified Purchase
Khaleesi
Charlottesville, US
★★★★★ 5
Great filter and easy installation
Style: BE-159 1-Pack, Style: BE-159 1-Pack
For my 2016 Hyundai Sonata Hybrid Limited. I cannot believe I paid so much more for a brand-name filter that does the same thing as this one. It is made of the same material as the dealer one I took out. Very easy to install, cant believe I paid for this to be done in the past with oil changes. Requires no tools and did not get dirty at all. No mechanical skills needed, especially if you run into trouble and can use YouTube. PROS - great quality, cannot tell that it is after-market - very professionally made, not irregularities seen - excellent fit in position, no adjustment needed - very easy to install, cannot believe I paid to have this done in the past - no mechanical skills needed to install - great price compared to what big name productions want for the same thing - cannot tell the difference in air quality between this and the dealer filter I took out - removes outside odor completely - did not require tools are getting dirty CONS - None
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
J
Verified Purchase
JimXeod
Chelsea, US
★★★★★ 5
Fits perfect and works as designed. Flows like OEM and looks well made.
Style: BE-553B 1-Pack
This filter is very comparable to the stock filter. Fits the BMW G20 just like OEM. I would not say it is two times "heavier" as advertised on the box, but it is very comparable to stock. It's the same weight and similar construction. BMW has a very robust cabin filter. This will be my go to. I did purchase another aftermarket cabin filter that fit well, but was thin, flimsy and had a bad chemical odor. This one is fine and airflow is the same as OEM. I change them every year or so. I don't worry too much about longevity with cabin filters personally.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
S
Verified Purchase
S. Phillips
Belleville, US
★★★★★ 4
Good quality but it was slightly longer than original and needed modification.
Style: BE-182 1-Pack
Bought this cabin filter for a 2023 Acura TLX. While the filter seems to be made of quality material, it was just a little too long (about a 1/16 of an inch, so I had to trim it to make it fit so the cover would fit snug. I was able to do that without compromising the filter itself. But this might be an issue for some people
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
K
Verified Purchase
Keith Granholm
Carnegie, US
★★★★★ 5
Fits my Chevy 2021 Bolt Premier perfectly.
Style: BE-966 1-Pack
Installation was a breeze, fir nicely and the air in teh car now smells fresh and clean. The old filter has developed a musty smell so this new one is great. Had it replaced in under 3 minutes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
P
Verified Purchase
Punkizback
Belleville, US
★★★★★ 5
Fits perfectly for my 2017 VW Passat
Style: BE-373 1-Pack, Style: BE-373 1-Pack
Bought this for a fraction of the cost. An auto shop wanted to charge me $72.99 for a filter so I bought this Spearhead brand cabin filter and its the perfect size and its just as sturdy as the previous one the dealership had in the car. Not sure yet how the airflow is or if anything different as I have not driven in the car since it was replaced, but it appears to be a very high quality cabin filter for my car at a great price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026

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