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 Mad Max Dual Port Cylinder Heads, (L6 heads) 42 X 37.5mm Valves, PAIR
ACN Mad Max Dual Port Cylinder Heads, (L6 heads) 42 X 37.5mm Valves, PAIR


 
ACN Mad Max Dual Port Cylinder Heads, (L6 heads) 42 X 37.5mm Valves PAIR are based on a brand new Revmaster 049 Aircraft Aluminum Alloy head casting! We have seen output in the 210hp range with perfect tunes, but normally these are good for 190ish HP. Must have 1 5/8" or better yet 1 3/4" exhaust! Aircooled.Net has sold our L6 heads for over a decade. These heads have a 66-68cc chamber (approximate and depending on bore size as follows:

90.5mm ~66cc
92mm ~66cc
94mm ~ 68cc

If you would like a larger or smaller chamber, we can provide this for an additional cost to get your compression ratio just how you want it.

These heads feature a recently developed new head casting, featuring 12mm x 3/4" Reach plugs (which prevents cracks at the plug threads), Hi Chrome Valve Seats, 42 x 37.5mm 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 AT LEAST 1 5/8" exhaust, 1 3/4" is even better to utilize the flow capability of these heads! Failure to heed this advice can result in difficult (IMPOSSIBLE) tuning issues, and likely cylinder head overheating.

ACN L6s flow over 210cfm on the intakes at .600" lift, and almost 200cfm at .500" Lift! This creates an incredibly wide and strong power band and torque curve that is hard to comprehend! In fact, these L6s are a top shelf cylinder head, laying waste to most "High Performance" cylinder heads available elsewhere. You absolutely MUST have the cam, exhaust, and intake to go along with them. In fact, this head used to cost around $1200/pair, but the CNC porting and chamber work has dropped the price to where it is now!

Dual 2bbls with venturis in the 40-42mm range are best in your carburetion of choice, dual 45s or 48s will work best (DRLA, IDF, or IDA)! Combustion Chambers are approximately 62cc in basic form, note that these chambers do NOT have the "Step" present, which makes your calculations and assembly easier! We can fly cut the chambers to the head cc you desire, contact us for details

With these heads we recommend valve lifts in the .550-.600" range, which is where they will perform at their best.

Price: $849.95
Restrictions: DISCOUNTS/PROMOCODES NOT VALID FOR THIS ITEM


: L6-HEADS-PAIR

Choose 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 Mad Max Dual Port Cylinder Heads, (L6 heads) 42 X 37.5mm Valves PAIR are based on a brand new Revmaster 049 Aircraft Aluminum Alloy head casting! We have seen output in the 210hp range with perfect tunes, but normally these are good for 190ish HP. Must have 1 5/8" or better yet 1 3/4" exhaust! Aircooled.Net has sold our L6 heads for over a decade, and these are now based on an imported casting. These heads have a 66-68cc chamber (approximate and depending on bore size), If you would like a larger or smaller chamber, we can provide this for an additional cost to get your compression ratio perfect!
Item Features
Lift- CFM
.050 -30.0
.100 -56.9
.150-81.5
.200-108.5
.250-131.5
.300-156.4
.350 -171.3
.400-184.4
.450-189.6
.500-197.6
.550-203.9
.600-209.0
.650-214.3

Exhaust flow a @28 inches of water

Lift -CFM
.050-26.7
.100-48.0
.150-69.1
.200-90.6
.250-110.3
.300-131.0
.350-132.9
.400-137.0
.450-140.0
.500-145.2
.550-149.9
.600-150.0

Related Items...
NGK D6EA Spark Plug, 12 x 3/4" Reach Threads, Conventional Tip, 11/16" Socket
Price: $4.95
NGK D6EA Spark Plug, 12 x 3/4" Reach Threads, Conventional Tip, 11/16" Socket
NGK DCPR6E Spark Plug, 12 x 3/4" Reach Threads, Projected Tip, 11/16" Socket, EACH
Price: $4.95
NGK DCPR6E Spark Plug, 12 x 3/4" Reach Threads, Projected Tip, 11/16" Socket, Each
CB Performance Dual IDF Weber Carburetor Kits, Choose from Type 1, Type 3, and Type 4 Engines
Price: $1,159.95
CB Performance Dual IDF Weber Carburetor Kits, Type 1, Type 3, and Type 4 Engines
DPR Chrome Vanadium 12V 200mm Lightened Flywheel
Price: $199.95
DPR Chrome Vanadium 12V 200mm Lightened Flywheel

Share your thoughts on this product with other customers...
Click here to be the first to WRITE A PRODUCT REVIEW!