OUR ONLINE CHECKOUT is CLOSED and we are NOT accepting any NEW orders at this time.

We are still fulfilling and shipping previously submitted and/or delayed order requests (as product availability allows) UNTIL NOVEMBER 15th 2022.

But after November 15th, all still pending backordered unshipped items will be automatically CANCELLED **(except for any special ordered drop-shipped or made/machined-to-order items).

Our ability to respond to emails is greatly hampered by being under-staffed during this downsize transition time. But we continue to endeavor to answer email inquiries as best we can. And we will continue responding to emails through until early March 2023 because we are wholly committed to resolving any other issues that may arise from previous sales. It is still UNCERTAIN, but we may re-open a substantially downsized version of our store again in the Spring of 2023.

We sincerely appreciate your patience, understanding during this period of restructuring and/or closing. And a huge thank you to all of you whose support and loyalty we have been the beneficiary of over the 23 years that we have worked diligently to support the information and parts needs of the aircooled VW community!


  VW Parts Catalog > Engine Parts >

ACN Road Warrior Dual Port Cylinder Heads, (L5 heads) 40 X 35mm Valves, PAIR
ACN Road Warrior Dual Port Cylinder Heads, (L5 heads) 40 X 35mm Valves, PAIR


 
ACN Road Warrior Dual Port Cylinder Heads, (L5 heads) 40 X 35mm Valves, PAIR are based on a brand new Revmaster 049 head casting, made from aircraft aluminum alloy! We have seen output in the 180-190hp range with perfect tunes, but normally these are good for 160ish HP. Must have 1 5/8" exhaust! Aircooled.Net has sold our L5s for over a decade, and these are now based on an imported casting, with larger ports than stock, along with a top notch valve job! These come cut with 12mm x 3/4" Reach spark plug threads too!

Depending on the bore size you select, chamber size will be the following approximate sizes:

85.5mm, 87 and 88mm Slip Ins ~ 58cc
88mm
~ 60cc
90.5mm, 92mm and 94mm ~ 64cc

If you would like a larger or smaller chamber, or need/want a specifically machined chamber volume, we can provide this for an additional cost to get your compression ratio perfect!


Aircooled.Net has sold the L5 cylinder head for over a decade, and now they are IMPROVED, being based on a recently developed new head casting, featuring 12mm x 3/4" Reach plugs (which prevents cracks at the plug threads), Hi Chrome Valve Seats, 40 x 35mm Stainless Steel Valves, Silicone Bronze Valve Guides, HD Dual Valve Springs, Chromoly Keepers and Retainers, then finished with a top notch valve job.

These flow so well you MUST get rid of the stock heater boxes, and go with a 1 5/8" exhaust, or you'll wind up with difficult (IMPOSSIBLE) tuning issues, and likely cylinder head overheating.

ACN L5s flow over 190cfm on the intakes at .600" lift, yet over 180cfm at .500" Lift! This creates an incredibly wide and strong power band and torque curve that is hard to comprehend! In fact, these L5s are the best HP/Dollar you can buy for your engine, assuming you have the cam, exhaust, and intake to go along with them. In fact, this head used to cost over $1k/pair, but the CNC porting and chamber work has dropped the price to where it is now!

Dual 2bbls with venturis in the 36-38mm range are best in your carburetion of choice, whether it's dual 44s, 45s, or 48s! Combustion Chambers are approximately 64cc in basic form, note that these chambers do NOT have the "Step" present, which makes your calculations and assembly easier! We can flycut the chambers to the head cc you desire, contact us for details or assistance.

With these heads we recommend valve lifts in the .450-.550" range, which is where they will perform at their best. If you insist on running more lift than this, you should consider our L6 or L7 heads so that your combination matches overall.

Price: $749.95
Restrictions: DISCOUNTS/PROMOCODES NOT VALID FOR THIS ITEM


: L5-HEADS-PAIR

Choose Head Bore Size

Head Bore Size:

Specify your Head Combustion Chamber Size

Specify CC:
[adds $40.00] optional
[adds $70.00 for PAIR of heads] optional
Custom Made Item Agreement

I AGREE TO THE MADE TO ORDER TERMS THAT APPLY TO THIS ITEM
MADE TO ORDER TERMS and CONDITIONS: This item is made-to-order and cannot be canceled once manufacture has been initiated (which is typically within 24 hours of order submission). Orders for this item are non-cancellable, non-returnable, and non-refundable. Item IS covered by warranty against verifiable defect for 90 days from date of shipment. Please double check your selection and/or specification to be certain you are ordering what you need!



QTY:
Overview
 
ACN Road Warrior Dual Port Cylinder Heads, (L5 heads) 40 X 35mm Valves, PAIR are based on a brand new Revmaster 049 head casting, made from aircraft aluminum alloy! We have seen output in the 180-190hp range with perfect tunes, but normally these are good for 160ish HP. Must have 1 5/8" exhaust! Aircooled.Net has sold our L5s for over a decade, and these are now based on an imported casting, with larger ports than stock, along with a top notch valve job! These come cut with 12mm x 3/4" Reach spark plug threads too!

If you would like specific chamber size, then choose the cc option (for an additional cost) to get your compression ratio perfect. If you do not specify a cc size, the chamber size is not checked and the actual chamber size may vary from the approximate sizes listed.
Item Features
Intake flow a @28 inches of water
Lift CFM
.050 29.8
.100 54.4
.150 80.5
.200 104.1
.250 125.7
.300 145.5
.350 159.9
.400 171.5
.450 180.6
.500 184.5
.550 188.3
.600 194.2

Exhaust flow a @28 inches of water

Lift CFM
.050 26.7
.100 48.0
.150 69.1
.200 90.6
.250 110.3
.300 123.1
.350 132.9
.400 136.1
.450 139.9
.500 141.1
.550 141.1
.600 141.1

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